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1

Unusual CT and MR Findings of Inflammatory Pseudotumor in the Parapharyngeal Space: Case Report  

Microsoft Academic Search

Summary: Unusual MR and CT findings of an inflamma- tory pseudotumor in the parapharyngeal space of a 73- year-old woman are reported. The mass was hypointense on T1- and T2-weighted images and demonstrated ring en- hancement after contrast medium injection. Punctated cal- cifications were scattered at the periphery. Inflammatory pseudotumors in the parapharyngeal space are rare, and only three cases

Keiko Nakayama; Yuichi Inoue; Tsunemasa Aiba; Kinuko Kono; Kenichi Wakasa; Ryusaku Yamada

2

A case of pulmonary choriocarcinoma metastasis with unusual FDG-PET and CT findings: correlation with pathology.  

PubMed

A 26-year-old female who had had a hydatidiform mole at 20 years of age showed high levels of serum human chorionic gonadotropin. Because pelvic ultrasound did not show any gestational sac in her uterus, she was suspected to have had an extrauterine pregnancy and a spontaneous abortion. About 6 months later, a pulmonary nodule in the patient's right upper lung field was found on a routine chest X-ray film. Contrast- enhanced CT scans revealed a solitary lobulated nodule 2.0 × 1.3 × 3.0 cm in diameter in the S2 segment of the right lung. CT suggested a vessel malformation. Positron emission tomography using 2-deoxy-2-[(18)F]fluoro-D-glucose (FDG-PET) was performed and showed weak FDG accumulation (SUVmax = 2.0) in the nodule, which did not positively indicate malignancy. Because a follow-up CT showed a rapid increase in the size of the nodule, partial resection of S2 segment in the right upper lobe was performed. The histopathological diagnosis was a metastasis from choriocarcinoma. The tumor consisted largely of necrosis and hemorrhage, and it was considered to be a major cause of the unusual FDG-PET and CT findings. PMID:22893003

Maruoka, Yasuhiro; Abe, Koichiro; Baba, Shingo; Isoda, Takuro; Matsuo, Yoshio; Kubo, Yuichiro; Ogawa, Shinji; Yano, Tokujiro; Sasaki, Masayuki; Honda, Hiroshi

2012-12-01

3

Recurrent malignant pheochromocytoma with unusual omental metastasis: 68Ga-DOTANOC PET/CT and 131I-MIBG SPECT/CT scintigraphy findings  

PubMed Central

Pheochromocytomas are rare catecholamine-secreting tumors derived from the sympathetic nervous system. The most common sites of metastasis for pheochromocytoma or extra-adrenal paraganglioma are lymph nodes, bones, lungs, and liver. Patients with known or suspected malignancy should undergo staging with computed tomography (CT) or magnetic resonance imaging as well as functional imaging (e.g. with 123I/131I-MIBG (131I-metaiodobenzylguanidine) and 68Ga-DOTANOC (68Ga-labeled [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid]-1-NaI3-octreotide) positron emission tomography (PET)/CT) to determine the extent and location of disease. We present a case of recurrent malignant pheochromocytoma with unusual site of metastasis in omentum, which was positive on 68Ga-DOTANOC PET/CT and 131I-MIBG single-photon emission computed tomography (SPECT/)/CT scintigraphy. PMID:25400380

Arora, Saurabh; Agarwal, Krishan Kant; Karunanithi, Sellam; Tripathi, Madhavi; Kumar, Rakesh

2014-01-01

4

Recurrent malignant pheochromocytoma with unusual omental metastasis: (68)Ga-DOTANOC PET/CT and (131)I-MIBG SPECT/CT scintigraphy findings.  

PubMed

Pheochromocytomas are rare catecholamine-secreting tumors derived from the sympathetic nervous system. The most common sites of metastasis for pheochromocytoma or extra-adrenal paraganglioma are lymph nodes, bones, lungs, and liver. Patients with known or suspected malignancy should undergo staging with computed tomography (CT) or magnetic resonance imaging as well as functional imaging (e.g. with (123)I/(131)I-MIBG ((131)I-metaiodobenzylguanidine) and (68)Ga-DOTANOC ((68)Ga-labeled [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid]-1-NaI3-octreotide) positron emission tomography (PET)/CT) to determine the extent and location of disease. We present a case of recurrent malignant pheochromocytoma with unusual site of metastasis in omentum, which was positive on (68)Ga-DOTANOC PET/CT and (131)I-MIBG single-photon emission computed tomography (SPECT/)/CT scintigraphy. PMID:25400380

Arora, Saurabh; Agarwal, Krishan Kant; Karunanithi, Sellam; Tripathi, Madhavi; Kumar, Rakesh

2014-10-01

5

Oral tuberculosis: unusual radiographic findings  

PubMed Central

Oral tuberculosis and its radiographic findings are not commonly encountered in an oral and maxillofacial radiology practice. Literature has occasional mention of the radiographic findings of oral tuberculosis, which are still ambiguous. When affected, it is manifested majorly in the oral mucosa and rarely in the jaw bones. Here, we report certain unusual radiographic findings of oral tuberculosis which have been rarely mentioned in the literature. Four illustrative cases describe bony resorption, condylar resorption, resorption of the inferior border of the mandible and rarefaction of the alveolar bone as radiographic findings of oral tuberculosis. Follow up of the first case demonstrated regeneration of the condylar head after anti-Kochs therapy was completed, a hitherto unreported phenomenon. The importance of including tuberculosis in the differential diagnosis of some of the unusual radiographic manifestations is emphasized. PMID:21493882

Sansare, K; Gupta, A; Khanna, V; Karjodkar, F

2011-01-01

6

Thoracic textilomas: CT findings*  

PubMed Central

OBJECTIVE: The aim of this study was to analyze chest CT scans of patients with thoracic textiloma. METHODS: This was a retrospective study of 16 patients (11 men and 5 women) with surgically confirmed thoracic textiloma. The chest CT scans of those patients were evaluated by two independent observers, and discordant results were resolved by consensus. RESULTS: The majority (62.5%) of the textilomas were caused by previous heart surgery. The most common symptoms were chest pain (in 68.75%) and cough (in 56.25%). In all cases, the main tomographic finding was a mass with regular contours and borders that were well-defined or partially defined. Half of the textilomas occurred in the right hemithorax and half occurred in the left. The majority (56.25%) were located in the lower third of the lung. The diameter of the mass was ? 10 cm in 10 cases (62.5%) and > 10 cm in the remaining 6 cases (37.5%). Most (81.25%) of the textilomas were heterogeneous in density, with signs of calcification, gas, radiopaque marker, or sponge-like material. Peripheral expansion of the mass was observed in 12 (92.3%) of the 13 patients in whom a contrast agent was used. Intraoperatively, pleural involvement was observed in 14 cases (87.5%) and pericardial involvement was observed in 2 (12.5%). CONCLUSIONS: It is important to recognize the main tomographic aspects of thoracic textilomas in order to include this possibility in the differential diagnosis of chest pain and cough in patients with a history of heart or thoracic surgery, thus promoting the early identification and treatment of this postoperative complication. PMID:25410842

Machado, Dianne Melo; Zanetti, Gláucia; Araujo, Cesar Augusto; Nobre, Luiz Felipe; Meirelles, Gustavo de Souza Portes; Pereira e Silva, Jorge Luiz; Guimarães, Marcos Duarte; Escuissato, Dante Luiz; Souza, Arthur Soares; Hochhegger, Bruno; Marchiori, Edson

2014-01-01

7

Atypical CT Findings in Plexiform Ameloblastoma  

PubMed Central

Ameloblastoma is an uncommon epithelial odontogenic neoplasm that is nonmineralized, locally aggressive, and, in most cases, benign. Most ameloblastomas develop in the molar-ramus region of the mandible with 70% of them arising in the molar-ramus area. Radiologically they are unilocular or multilocular radiolucency with a honeycomb or soap bubble appearance. The radiographic appearance of ameloblastoma can vary according to the type of tumor. CT is usually helpful in determining the contours of the lesion, its contents, and its extension into soft and hard tissues. Through this case we would bring to light some of the unusual CT findings which include the destruction of the surrounding structures by the lesion which appeared to be normal routine lesion when viewed clinically. PMID:25506456

Binjoo, Nagesh; Modgil, Richa; Negi, Lalit Singh; Kaur, Prabhpreet

2014-01-01

8

Atypical CT Findings in Plexiform Ameloblastoma.  

PubMed

Ameloblastoma is an uncommon epithelial odontogenic neoplasm that is nonmineralized, locally aggressive, and, in most cases, benign. Most ameloblastomas develop in the molar-ramus region of the mandible with 70% of them arising in the molar-ramus area. Radiologically they are unilocular or multilocular radiolucency with a honeycomb or soap bubble appearance. The radiographic appearance of ameloblastoma can vary according to the type of tumor. CT is usually helpful in determining the contours of the lesion, its contents, and its extension into soft and hard tissues. Through this case we would bring to light some of the unusual CT findings which include the destruction of the surrounding structures by the lesion which appeared to be normal routine lesion when viewed clinically. PMID:25506456

Arora, Karandeep Singh; Binjoo, Nagesh; Modgil, Richa; Negi, Lalit Singh; Kaur, Prabhpreet

2014-01-01

9

Congenital unilateral hydrocephalus--CT findings.  

PubMed

Congenital unilateral hydrocephalus is extremely uncommon with 18 cases previously reported in the English literature. Two additional newborns with unilateral hydrocephalus are presented. The second baby also presented a mega cisterna magna. This unusual association between Dandy-Walker variant and unilateral hydrocephalus has not been previously reported. Following ventriculo-peritoneal shunt, the babies had a normal cognitive neurodevelopment. The role of cranial computed tomography (CT) in diagnosis and follow-up is emphasized. PMID:11091018

Schulman, H; Landau, D; Schulman, P; Hertzanu, Y

2000-12-01

10

Cytomegalovirus pneumonia in transplant patients: CT findings  

SciTech Connect

Our goal was to assess the CT findings of cytomegalovirus (CMV) pneumonia in transplant patients. The study included 10 transplant patients who had chest CT scan and pathologically proven isolated pulmonary CMV infection. Five patients had bone marrow transplant and five had solid organ transplant. The CT scans were retrospectively reviewed for pattern and distribution of disease and the CT findings compared with the findings on open lung biopsy (n = 9) and autopsy (n = 1). Nine of 10 patients had parenchymal abnormalities apparent at CT and I had normal CT scans. The findings in the nine patients included small nodules (n = 6), consolidation (n = 4), ground-glass attenuation (n = 4), and irregular lines (n = 1). The nodules had a bilateral and symmetric distribution and involved all lung zones. The consolidation was most marked in the lower lung zones. The CT findings of CMV pneumonia in transplant patients are heterogeneous. The most common patterns include small nodules and areas of consolidation. 13 refs., 4 figs., 1 tab.

Eun-Young Kang; Patz, E.F. Jr.; Mueller, N.L. [Duke Univ. Medical Center, Durham, NC (United States)

1996-03-01

11

Specific CT findings in Krabbe disease  

SciTech Connect

Specific computed tomography (CT) findings in four patients with biochemically proven Krabbe disease included symmetric increased attenuation in the cerebellum, brainstem, thalami, caudate nuclei, and corona radiata before and in conjunction with decreased attenuation of white matter followed by atrophy at a later stage. Familiarity with the CT findings in the acute phase of Drabbe disease may assist clinicians in limiting the differential diagnosis and requesting appropriate laboratory tests.

Kwan, E.; Drace, J.; Enzmann, D.

1984-09-01

12

Unusual ocular motor findings in multiple sclerosis.  

PubMed

In multiple sclerosis (MS), nystagmus or internuclear ophthalmoplegia (INO) are the usual ocular motor dysfunctions. However, in patients with focal brainstem lesions, other rare manifestations may be observed, such as an isolated ocular motor nerve palsy or complex ocular motor disturbances. We report five MS patients with unusual ocular motor disturbances (bilateral third nerve palsy [n = 2], opsoclonus, Horner's syndrome and one-and-a-half syndrome). We discuss possible correlations between clinical disturbances and MRI abnormalities. Patients were seen in two MS centres. They had a confirmed diagnosis of MS and underwent a brain MRI and a complete neuro-ophthalmological work-up. In one case (opsoclonus), ocular motor manifestations were the first manifestation of MS. In the other four cases they occurred 3 months (Horner syndrome), 6 years and 12 years (bilateral third nerve palsy) and 2 years (one-and-a-half syndrome) after the disease onset, respectively. Four out of five patients were still in a relapsing-remitting form of MS. In the opsoclonus case, there was no evidence of a brainstem lesion. A gadolinium-enhanced lesion (2 cases) or a new T2-weighted lesion located in the brainstem correlated with the clinical presentation. All patients completely or partially recovered after corticosteroid infusions. Our study shows some rare or previously undescribed complex ocular motor symptoms in MS. PMID:16466746

de Seze, J; Vukusic, S; Viallet-Marcel, M; Tilikete, C; Zéphir, H; Delalande, S; Stojkovic, T; Defoort-Dhellemmes, S; Confavreux, C; Vermersch, P

2006-04-15

13

Calcific tendinitis of the gluteus maximus tendon: CT findings.  

PubMed

Two cases of calcific tendinitis of gluteus maximus muscle are presented. The CT findings, including amorphous calcification without soft tissue mass and possible cortical erosion at the femoral enthesis of the gluteus maximus muscle, are highly suggestive of calcific tendinitis at this unusual but classical location. Ossifying entheses with well-defined cortical defect are frequent at the femoral insertion of the gluteus maximus muscle in asymptomatic subjects and must be differentiated from a real cortical erosion sometimes associated with these calcific tendinitis. PMID:10415243

Hottat, N; Fumière, E; Delcour, C

1999-01-01

14

Gastric xanthelasma: an unusual endoscopic finding.  

PubMed

Gastric xanthelasma is a rarely encountered finding in upper gastrointestinal (GI) endoscopy. It is characterised by yellowish-white plaque in the stomach especially in the antrum or the pyloric region. Histologically it consists of foamy macrophages in the lamina propria. It is a benign condition but its appearance mimics malignancy and it is found to be associated with various conditions, some of which are considered premalignant so, histological confirmation is necessary. We present a case of a 44-year-old man who presented to the medicine outpatient department for intermittent pain in epigastrium for the last 2 years. His physical examination was normal. His haematological and biochemical investigations were also normal. His upper GI endoscopy revealed yellowish-white plaque in fundus of the stomach, which was diagnosed as gastric xanthelasma by histological examination with associated chronic gastritis. PMID:24165503

Dhakal, Mona; Dhakal, O P; Bhandari, Dhurba; Gupta, Amlan

2013-01-01

15

Unusual thoracic radiographic findings in children treated for Hodgkin's disease  

Microsoft Academic Search

Mantle irradiation is often part of the treatment for Hodgkin's disease. Localized pneumonitis and fibrosis are well-known sequelae of this treatment. We report nine patients with unusual thoracic radiographic findings following treatment for Hodgkin's disease. All nine had mediastinal widening. Seven of these patients received combined modality therapy in which prednisone was given with their MOPP. In these seven patients,

M. S. Jochelson; N. J. Tarbell; H. J. Weinstein

1986-01-01

16

Primary epiploic appendagitis: US and CT findings  

Microsoft Academic Search

.   A retrospective review is presented of seven cases of epiploic appendagitis, with surgical confirmation in one case. The\\u000a main clinico-analytical data and the US and CT findings are described, as well as the histopathologic features in the sole\\u000a case that underwent surgical resection. We also calculated the frequency of this entity in patients undergoing emergency abdominal\\u000a US on clinical

T. Ripollés; M. J. Martínez; V. Morote; E. Roselló-Sastre

1998-01-01

17

Intestinal Ischemia: US-CT findings correlations  

PubMed Central

Background Intestinal ischemia is an abdominal emergency that accounts for approximately 2% of gastrointestinal illnesses. It represents a complex of diseases caused by impaired blood perfusion to the small and/or large bowel including acute arterial mesenteric ischemia (AAMI), acute venous mesenteric ischemia (AVMI), non occlusive mesenteric ischemia (NOMI), ischemia/reperfusion injury (I/R), ischemic colitis (IC). In this study different study methods (US, CT) will be correlated in the detection of mesenteric ischemia imaging findings due to various etiologies. Methods Basing on experience of our institutions, over 200 cases of mesenteric ischemia/infarction investigated with both US and CT were evaluated considering, in particular, the following findings: presence/absence of arterial/venous obstruction, bowel wall thickness and enhancement, presence/absence of spastic reflex ileus, hypotonic reflex ileus or paralitic ileus, mural and/or portal/mesenteric pneumatosis, abdominal free fluid, parenchymal ischemia/infarction (liver, kidney, spleen). Results To make an early diagnosis useful to ensure a correct therapeutic approach, it is very important to differentiate between occlusive (arterial,venous) and nonocclusive causes (NOMI). The typical findings of each forms of mesenteric ischemia are explained in the text. Conclusion At present, the reference diagnostic modality for intestinal ischaemia is contrast-enhanced CT. However, there are some disadvantages associated with these techniques, such as radiation exposure, potential nephrotoxicity and the risk of an allergic reaction to the contrast agents. Thus, not all patients with suspected bowel ischaemia can be subjected to these examinations. Despite its limitations, US could constitutes a good imaging method as first examination in acute settings of suspected mesenteric ischemia. PMID:23902826

2013-01-01

18

Van der Woude syndrome with an unusual intraoral finding.  

PubMed

Orofacial manifestations of Van der Woude syndrome (VWS) include cleft lip or palate, lower lip pits, hypodontia, hypernasal voice, cleft or bifid uvula, syngnathia, narrow high arched palate, and ankyloglossia. Extraoral manifestations include limb anomalies, popliteal webs, accessory nipples, congenital heart defects, and Hirschsprung disease. We report an interesting case of VWS with characteristic orofacial features along with an unusual additional finding of fusion of primary mandibular left lateral incisor and canine in a 7-year-old boy. PMID:21525698

Sarode, Gargi S; Desai, Rajiv S; Sarode, Sachin C; Kulkarni, Meena A

2011-01-01

19

Unusual thoracic radiographic findings in children treated for Hodgkin's disease  

SciTech Connect

Mantle irradiation is often part of the treatment for Hodgkin's disease. Localized pneumonitis and fibrosis are well-known sequelae of this treatment. We report nine patients with unusual thoracic radiographic findings following treatment for Hodgkin's disease. All nine had mediastinal widening. Seven of these patients received combined modality therapy in which prednisone was given with their MOPP. In these seven patients, an increase in mediastinal width developed at the same time as the radiographic changes of radiation pneumonitis. Two patients developed bilateral infiltrates extending beyond the field of radiation to the lung periphery. In one of these patients, a spontaneous pneumomediastinum developed. One patient underwent mediastinal biopsy that revealed inflammatory changes similar to those seen in radiation pneumonitis. All patients either responded to steroids or had spontaneous regression of radiographic abnormalities supporting the presumed diagnosis of treatment related changes. Recognition of these unusual sequelae of mantle irradiation will aid in differentiating them from infection or tumor and lead to prompt, appropriate treatment.

Jochelson, M.S.; Tarbell, N.J.; Weinstein, H.J.

1986-06-01

20

[The chest CT findings and pathologic findings of pulmonary tuberculosis].  

PubMed

The past research of the radiologic manifestations of pulmonary tuberculosis in Japan was based on morphological pathology of the untreated patient autopsy. I would like to show the chest CT scan of tuberculosis diseases with caseous granuloma at its exudative reaction, proliferative reaction, productive reaction, cirrhotic reaction until self cure. This progress reflects the normal cell mediated immunological responses. Also I would like to show the cavitation of granuloma, which results from liquefaction of caseous materials during the course and results in the formation of the source of infection. And finally I would like to show the morphological differences of acinous lesion, acino-nodular lesion and caseous lobular pneumonia. These differences reflect the amount of bacilli disseminated in the peripheral parts under the lobules. In this study, I do not show old age cases and HIV positive cases, who do not form typical granuloma due to the decreased cell mediated immnunity and whose X ray findings are atypical. PMID:19764461

Ogata, Hideo

2009-08-01

21

Actinomycosis involving the chest wall: CT findings  

SciTech Connect

Two cases of pulmonary actinomycosis with extension to involve the chest wall that were evaluated using computerized tomography are reported. In both cases, the relation of pulmonary and chest wall disease was best shown using CT. (KRM)

Webb, W.R. (Univ. of California, San Francisco); Sagel, S.S.

1982-11-01

22

Merkel Cell Carcinoma: CT Findings in 12 Patients  

Microsoft Academic Search

OBJECTIVE. The purpose of this report is to determine CT imaging findings in patients with Merkel cell carcinoma. MATERIALS AND METHODS. Fifty-three CT scans in 12 patients with biopsy- proven Merkel cell carcinoma were retrospectively reviewed with regard to size, location, and attenuation of primary skin lesions and visceral and lymph node metastases. Findings that were present in 12 patients

Marc J. Gollub; David R. Gruen; David Dershaw

23

Acute epiploic appendagitis: CT findings in 33 cases  

Microsoft Academic Search

.   Acute epiploic appendagitis (AEA) is a benign self-limiting process presenting with acute abdominal pain often misdiagnosed\\u000a clinically as either diverticulitis or appendicitis, but which has a pathognomonic CT appearance. The CT findings in 33 adult\\u000a patients diagnosed by CT over a 33-month period as having AEA were retrospectively reviewed. The study group included 24 men\\u000a and 9 women, with

Rivka Zissin; Marjorie Hertz; Alexandra Osadchy; Eugene Kots; Myra Shapiro-Feinberg; Haim Paran

2002-01-01

24

Complications of optical colonoscopy: CT findings.  

PubMed

The development of colorectal cancer screening programs in many countries has led to increasingly large numbers of patients undergoing optical colonoscopy. Although acute complications from screening optical colonoscopy are uncommon, they may occur in up to 5% or more of patients where biopsies or therapeutic procedures are performed. Abdominal radiographs are of value only for the detection of intraperitoneal perforation. There is a wide spectrum of other important associated complications. Such complications are most reliably identified using abdominal and pelvic CT, which also can guide appropriate conservative, interventional, or surgical management. PMID:25173660

Daly, Barry; Lu, Minh; Pickhardt, Perry J; Menias, Christine O; Abbas, Maher A; Katz, Douglas S

2014-09-01

25

CT of fibrosing mediastinitis: findings and their utility  

SciTech Connect

The computed tomographic (CT) manifestations of fibrosing mediastinitis were assessed in seven patients with pathologically proven disease. Computed tomography had been done to evaluate further a mediastinal or hilar mass seen on the conventional chest radiograph or to define extent of disease preoperatively. Findings included a mediastinal or hilar mass (7/7), calcifications of the central mass or in associated lymph nodes (6/7), tracheobronchial narrowing (5/7), and pulmonary infiltrates (4/7). In six of the seven patients, CT demonstrated masses or calcifications that were not evident with conventional radiography. The CT findings often were sufficient to suggest or corroborate the diagnosis of fibrosing mediastinitis, and the extent of the disease process was well depicted. In selected patients the CT findings may be sufficient to exclude the need for diagnostic tissue sampling.

Weinstein, J.B.; Aronberg, D.J.; Sagel, S.S.

1983-08-01

26

Thoracic manifestation of Wegener's granulomatosis: CT findings in 30 patients.  

PubMed

Our objective was to describe the CT findings of thoracic Wegener's granulomatosis. At presentation, both conventional and thin-section CT scans were available in 30 patients with Wegener's granulomatosis. Serial CT scans (range of intervals: 1-25 months, mean 4.5 months) were available in 20 patients. The initial and follow-up CT scans were analyzed retrospectively by two observers in terms of pattern and extent of parenchymal and airway lesions. Positive CT findings were seen in 29 of 30 (97%) patients at initial presentation. The most common pattern was nodules or masses seen in 27 of 30 (90%) patients. They were multiple in 23 of 27 (85%) patients, bilateral in 18 (67%), subpleural in 24 (89%), and peribronchovascular in 11 (41%) in distribution. Bronchial wall thickening in the segmental or subsegmental bronchi was seen in 22 (73%) patients. Large airways were also abnormal in 9 (30%) patients. Patchy areas of consolidation and ground-glass opacity were seen in 7 (23%) patients, respectively. In 17 of 20 (85%) patients in whom follow-up CT scans were available, the parenchymal or airway lesion showed complete or partial improvement with treatment. The CT findings of Wegener's granulomatosis, although multiple and variable, consist mainly of bilateral subpleural or peribronchovascular nodules or masses and bronchial wall thickening in the segmental or subsegmental bronchi. Parenchymal and airway lesions improve with treatment in most patients. PMID:12541109

Lee, Kyung Soo; Kim, Tae Sung; Fujimoto, Kiminori; Moriya, Hiroshi; Watanabe, Hideyuki; Tateishi, Ukihide; Ashizawa, Kazuoto; Johkoh, Takeshi; Kim, Eun A; Kwon, O Jung

2003-01-01

27

Renal complications of polyarteritis nodosa: CT findings.  

PubMed

Three patients with multiple renal complications of polyarteritis nodosa are described. The arteriographic findings in these patients were multiple arterial aneurysms and tissue infarctions, with the development of spontaneous intrarenal, subcapsular, and perirenal hemorrhagic complications. Computed tomography showed the hemorrhages and multiple renal infarcts; acute and late forms could be differentiated on the basis of contrast medium enhancement and scar formation. PMID:2857737

Hekali, P; Kivisaari, L; Standerskjöld-Nordenstam, C G; Pajari, R; Turto, H

1985-01-01

28

Uncommon CT Findings in Relapsing Polychondritis  

Microsoft Academic Search

Summary: Relapsing polychondritis is a rare inflammatory disorder of cartilage with well-established clinical features and imaging characteristics. Abnormal calcification and erosion of cartilaginous structures are the traditional ra- diographic findings. As with any disease, aberrancies of the expected clinical presentation may lead to a delayed (or missed) diagnosis. We discuss a rare case of relapsing polychondritis in which the diagnosis

Laura E. Faix; Barton F. Branstetter

29

Askin tumor: CT and FDG-PET/CT imaging findings and follow-up.  

PubMed

The aim of the study was to describe the imaging findings of Askin tumors on computed tomography (CT) and fluorine 18 fluorodeoxyglucose-positron emission tomography (FDG-PET/CT).Seventeen cases of Askin tumors confirmed by histopathology were retrospectively analyzed in terms of CT (17 cases) and FDG-PET/CT data (6 cases).Fifteen of the tumors were located in the chest wall and the other 2 were in the anterior middle mediastinum. Of the 15 chest wall cases, 13 demonstrated irregular, heterogeneous soft tissue masses with cystic degeneration and necrosis, and 2 demonstrated homogeneous soft tissue masses on unenhanced CT scans. Two mediastinal tumors demonstrated the irregular, heterogeneous soft tissue masses. Calcifications were found in 2 tumors. The tumors demonstrated heterogeneously enhancement in 16 cases and homogeneous enhancement in 1 case on contrast-enhanced scans. FDG-PET/CT images revealed increased metabolic activity in all 6 cases undergone FDG-PET/CT scan, and the lesion SUVmax ranged from 4.0 to 18.6. At initial diagnosis, CT and FDG-PET/CT scans revealed rib destruction in 9 cases, pleural effusion in 9 cases, and lung metastasis in 1 case. At follow-up, 12 cases showed recurrence and/or metastases, 4 cases showed improvement or remained stable, and 1 was lost to follow-up.In summary, CT and FDG-PET/CT images of Askin tumors showed heterogeneous soft tissue masses in the chest wall and the mediastinum, accompanied by rib destruction, pleural effusion, and increased FDG uptake. CT and FDG-PET/CT imaging play important roles in the diagnosis and follow-up of patients with Askin tumors. PMID:25058144

Xia, Tingting; Guan, Yubao; Chen, Yongxin; Li, Jingxu

2014-07-01

30

Serial CT Findings of Paragonimus Infested Dogs and the Micro-CT Findings of the Worm Cysts  

PubMed Central

Objective To investigate the serial CT findings of Paragonimus westermani infected dogs and the microscopic structures of the worm cysts using Micro-CT. Materials and Methods This study was approved by the committee on animal research at our institution. Fifteen dogs infected with P. westermani underwent serial contrast-enhanced CT scans at pre-infection, after 10 days of infection, and monthly thereafter until six months for determining the radiologic-pathologic correlation. Three dogs (one dog each time) were sacrificed at 1, 3 and 6 months, respectively. After fixation of the lungs, both multi-detector CT and Micro-CT were performed for examining the worm cysts. Results The initial findings were pleural effusion and/or subpleural ground-glass opacities or linear opacities at day 10. At day 30, subpleural and peribronchial nodules appeared with hydropneumothorax and abdominal or chest wall air bubbles. Cavitary change and bronchial dilatation began to be seen on CT scan at day 30 and this was mostly seen together with mediastinal lymphadenopathy at day 60. Thereafter, subpleural ground-glass opacities and nodules with or without cavitary changes were persistently observed until day 180. After cavitary change of the nodules, the migratory features of the subpleural or peribronchial nodules were seen on all the serial CT scans. Micro-CT showed that the cyst wall contained dilated interconnected tubular structures, which had communications with the cavity and the adjacent distal bronchus. Conclusion The CT findings of paragonimiasis depend on the migratory stage of the worms. The worm cyst can have numerous interconnected tubular channels within its own wall and these channels have connections with the cavity and the adjacent distal bronchus. PMID:17923779

Lee, Chang Hyun; Goo, Jin Mo; Lee, Hyun Ju; Hong, Sung-Tae; Shen, Cheng Hua; Chung, Doo Hyun; Son, Kyu Ri; Chang, Jung Min; Eo, Hong

2007-01-01

31

Thymic involvement in Hodgkin disease: CT and sonographic findings.  

PubMed

To evaluate the morphologic characteristics and frequency of thymic enlargement in Hodgkin disease, the initial and follow-up computed tomographic (CT) scans of 43 patients with newly diagnosed Hodgkin lymphoma were retrospectively analyzed. Sonograms of the thymic region in 21 patients were also available and were compared with the CT scans. Initial CT scans showed thymic enlargement in 17 of the 43 patients, no evidence of thymic enlargement in 15 patients, and equivocal findings in 11 patients. Analysis of follow-up CT scans indicated that seven of the 11 patients with initially equivocal findings had had thymic enlargement. In all seven patients, the anterior mediastinal tumor shrank with therapy and adopted a typical tongue-shaped thymic configuration. In nine of the 24 patients with thymic enlargement, the thymus remained enlarged after therapy and full clinical remission. The comparison of sonograms and CT scans showed that sonography could not help differentiate the normal-size thymus from surrounding fatty tissue. All thymic glands that were considered diseased because of enlargement at CT were sonographically visible due to an abnormal, hypoechoic structure. The results of the study show that thymic enlargement presumed to be due to involvement by Hodgkin disease seems to occur more frequently than previously reported. PMID:1924775

Wernecke, K; Vassallo, P; Rutsch, F; Peters, P E; Potter, R

1991-11-01

32

Cigarette smoking: CT and pathologic findings of associated pulmonary diseases.  

PubMed

The health risks associated with cigarette smoking are well known. Cigarette smoking is the most important causative factor in the development of bronchogenic carcinoma. Pulmonary diseases such as chronic bronchitis, centrilobular and panacinar emphysema, respiratory bronchiolitis-associated interstitial lung disease (RB-ILD), and pulmonary Langerhans cell histiocytosis are also related to cigarette smoking. In adenocarcinoma and squamous cell carcinoma, the most common manifestation at computed tomography (CT) is a solitary pulmonary nodule; in small cell carcinoma, hilar and mediastinal adenopathy secondary to metastases; and in large cell carcinoma, a mass with central necrosis or cavitation in the lung periphery. For chronic bronchitis, the most common CT finding is bronchial wall thickening, but this finding is nonspecific. Emphysema, both centrilobular and panacinar associated with alpha-1-antitrypsin deficiency, usually manifests as areas of decreased attenuation and may involve bullous changes. However, centrilobular emphysema more commonly involves the upper lungs, whereas panacinar emphysema more commonly involves the lower lungs. Most patients with RB-ILD have normal high-resolution CT scans; however, abnormalities may be present, the most common of which are areas of ground-glass attenuation. CT appearance of pulmonary Langerhans cell histiocytosis varies depending on the disease stage: In the early stage, typical CT findings include multiple nodules, usually accompanied by cystic spaces with thin, well-defined walls. As the disease progresses, the cystic spaces become more numerous and the number of nodules decreases. PMID:9084079

Hartman, T E; Tazelaar, H D; Swensen, S J; Müller, N L

1997-01-01

33

Thoracic Imaging Findings of Collagen Vascular Diseases: A CT Study  

PubMed Central

Background Collagen vascular diseases (CVDs) are well known causes of pulmonary involvement, leading to significant morbidity. The purpose of this study was to identify several thoracic computed tomographic findings of CVDs. Materials and Methods The study included 56 patients (15 males and 41 females) with histopathologically and clinically proven CVDs who were identified retrospectively. The presence, extent and distribution of various CT findings were evaluated by a radiologist. Results Lung parenchyma (96.4%) was the most common area of involvement. The lower lobes (89.2%) were the most frequent sites of involvement. The predominant CT patterns were reticulation (55.3%), peripheral subpleural interlobular septal thickening (51.7%) and ground glass opacity (50%). The most common histopathological findings according to CT features were obliterative bronchiolitis (OB, 44.6%) and non-specific interstitial pneumonia (NSIP, 33.9%). Usual interstitial pneumonia was seen in 12.5% and organizing pneumonia in 26.7% of patients. Conclusion A combination of reticular pattern, peripheral subpleural interlobular septal thickening and ground glass opacity is seen in the majority of patients with CVDs. The results indicate that OB is more prevalent than what has been reported in previous studies. The CT patterns of pulmonary fibrosis are similar to those in most other studies. PMID:25191493

Karam, Mehrdad Bakhshayesh; Peivareh, Hamideh

2014-01-01

34

CT Findings of the Interval Form of Carbon Monoxide Poisoning Compared with Neuropathological Findings  

Microsoft Academic Search

Cerebral computed tomography findings were described in 2 clinical cases of the interval form of carbon monoxide poisoning and comparison with postmortem CT finding of an autopsy case was made. There was low density in the bilateral frontal region, centrum semiovale and pallidal parts. In the course of the disease, the degree of low density in the white matter showed

Katsuji Kobayashi; Kiminori Isaki; Yuken Fukutani; Masayoshi Kurachi; Akira Eboshida; Rokuro Matsubara; Nariyoshi Yamaguchi

1984-01-01

35

Early CT findings of global central nervous system hypoperfusion  

SciTech Connect

The early computed tomographic (CT) findings of acute global central nervous system hypoperfusion were studied in 10 patients. The findings could be characterized as: (1) diffuse mass effect with effacement of the cerebral sulci and of the brainstem cisterns (nine patients); (2) global decrease in the cortical gray-matter density from edema, causing loss of the normal gray-white matter differentiation (six patients); (3) low-density lesions of the basal ganglia bilaterally (five patients); and (4) decreased gray-matter density in watershed distributions bilaterally (two patients). Subsequent contrast-enhanced scans in three of the 10 patients demonstrated selective enhancement of the cerebral cortex or the basal ganglia or both. The CT findings seen in this study predicted a poor outcome; nine of the 10 patients died from the insult. The abnormal CT findings can be ascribed to increased vulnerability of the cerebral cortex and basal ganglia to hypotensive episodes. This vulnerability is due to the large metabolic demand of these regions and their characteristic local cerebral blood flow.

Kjos, B.O.; Brant-Zawadzki, M.; Young, R.G.

1983-12-01

36

The missing foley catheter: an unusual finding in vesicouterine fistula  

PubMed Central

A 28-year-old G1P1 presented complaining of urine leakage per vaginum following caesarean delivery, accompanied by amenorrhoea, cyclic haematuria and cyclic pelvic pain. Examination findings were suggestive of vesicouterine fistula and the patient was taken for exploratory laparotomy, during which the foley catheter could not be identified within the bladder. During separation of the bladder from the uterus, the catheter was found to be traversing the fistulous tract into the uterine cavity. Vesicouterine fistula is a fairly uncommon type of urogenital fistula that is frequently associated with caesarean section. Surgical treatment remains the mainstay and successfully cured this patient. PMID:24968444

Shephard, Steven N.; Lengmang, Sunday J.

2013-01-01

37

CT Pulmonary Findings in Healthy Older Adult Aspirators versus Nonaspirators  

PubMed Central

Objectives/Hypothesis In previous studies, we consistently found that approximately 30% of asymptomatic healthy older adults silently aspirated liquids during a flexible endoscopic evaluation of swallowing (FEES), and that their aspiration status was stable for the following year. However, no studies have systematically evaluated effects of silent aspiration on lung parenchyma and airways. We used computed tomography (CT) to compare lungs of healthy older adult aspirators versus nonaspirators. We hypothesized that CT images would show pulmonary differences in healthy older adult aspirators versus nonaspirators. Study Design Prospective study. Methods Fifty healthy older adults (25 aspirators and 25 nonaspirators) who participated in a previous FEES were randomly selected. CT scans were performed; on inspiration, lung views were taken at 1.25 mm and 2.5 mm windows; on expiration, lung views were taken at 2.5 mm. CT scans were reviewed by radiologists blinded to group assignment. Outcomes included bronchiectasis, bronchiolectasis, bronchial wall thickening, parenchymal band, fibrosis, air trapping, intraluminal airway debris, and tree-in-bud pattern. Results Chi-square analyses between aspirators and nonaspirators found no statistically significant differences between aspirators and nonaspirators for any outcomes (p > 0.05). Logistic regression analyses adjusted for smoking did not change the results. Conclusion(s) There were no differences in pulmonary CT findings between healthy older adult aspirators and nonaspirators. This study adds to the evidence that some aspiration may be within the range of normal for older adults, or at least does not contribute to a change in pulmonary appearance on CT images. PMID:23832617

Butler, Susan G.; Clark, Hollins; Baginski, Scott G.; Todd, J. Tee; Lintzenich, Catherine; Leng, Xiaoyan

2013-01-01

38

Unusual histopathological findings in appendectomy specimens: A retrospective analysis and literature review  

PubMed Central

AIM: To document unusual findings in appendectomy specimens. METHODS: The clinicopathological data of 5262 patients who underwent appendectomies for presumed acute appendicitis from January 2006 to October 2010 were reviewed retrospectively. Appendectomies performed as incidental procedures during some other operation were excluded. We focused on 54 patients who had unusual findings in their appendectomy specimens. We conducted a literature review via the PubMed and Google Scholar databases of English language studies published between 2000 and 2010 on unusual findings in appendectomy specimens. RESULTS: Unusual findings were determined in 54 (1%) cases by histopathology. Thirty were male and 24 were female with ages ranging from 15 to 84 years (median, 32.2 ± 15.1 years). Final pathology revealed 37 cases of enterobiasis, five cases of carcinoids, four mucinous cystadenomas, two eosinophilic infiltrations, two mucoceles, two tuberculosis, one goblet-cell carcinoid, and one neurogenic hyperplasia. While 52 patients underwent a standard appendectomy, two patients who were diagnosed with tuberculous appendicitis underwent a right hemicolectomy. All tumors were located at the distal part of the appendix with a mean diameter of 6.8 mm (range, 4-10 mm). All patients with tumors were alive and disease-free during a mean follow-up of 17.8 mo. A review of 1366 cases reported in the English literature is also discussed. CONCLUSION: Although unusual pathological findings are seldom seen during an appendectomy, all appendectomy specimens should be sent for routine histopathological examination. PMID:21528073

Akbulut, Sami; Tas, Mahmut; Sogutcu, Nilgun; Arikanoglu, Zulfu; Basbug, Murat; Ulku, Abdullah; Semur, Heybet; Yagmur, Yusuf

2011-01-01

39

Renal infarction: CT diagnosis and correlation between CT findings and etiologies  

SciTech Connect

The CT scans and the clinical records of 12 patients who had renal infarction were reviewed. The renal infarcts were classified as either focal or global. The CT findings were correlated with the etiologies of renal infarction. Embolism was the most common cause of renal infarcts that were multifocal with involvement of both kidneys. Trauma caused a unilateral global type of infract. A case of sickle cell anemia presented with multiple ''slit-like'' focal infarcts and enlarged kidneys. Forty-seven per cent of infarcts demonstrated the cortical rim sign, 11% were acapsular fluid collection, and 6% had an abnormally thickened renal fascia.

Wong, W.S.; Moss, A.A.; Federle, M.P.; Cochran, S.T.; London, S.S.

1984-01-01

40

Lymphomatoid Granulomatosis: CT and FDG-PET Findings  

PubMed Central

Objective Lymphomatoid granulomatosis (LG) is a rare, aggressive extranodal Epstein-Barr virus (EBV)-positive B-cell lymphoproliferative disease. The purpose of our study was to analyze the CT and fluorodeoxyglucose positron emission tomography (FDG-PET) findings of pulmonary LG. Materials and Methods Between 2000 and 2009, four patients with pathologically proven pulmonary LG and chest CT were identified. Two of these patients also had FDG-PET. Imaging features of LG on CT and PET were reviewed. Results Pulmonary nodules or masses with peribronchovascular, subpleural, and lower lung zonal preponderance were present in all patients. Central low attenuation (4 of 4 patients), ground-glass halo (3 of 4 patients), and peripheral enhancement (4 of 4 patients) were observed in these nodules and masses. An air-bronchogram and cavitation were seen in three of four patients. FDG-PET scans demonstrated avid FDG uptake in the pulmonary nodules and masses. Conclusion Pulmonary LG presents with nodules and masses with a lymphatic distribution, as would be expected for a lymphoproliferative disease. However, central low attenuation, ground-glass halo and peripheral enhancement of the nodules/masses are likely related to the angioinvasive nature of this disease. Peripheral enhancement and ground-glass halo, in particular, are valuable characteristic not previously reported that can help radiologists suggest the diagnosis of pulmonary LG. PMID:22043148

Wu, Carol C.; Gilman, Matthew D.; Palmer, Edwin L.; Hasserjian, Robert P.; Shepard, Jo-Anne O.

2011-01-01

41

Dual-phase CT findings of groove pancreatitis?  

PubMed Central

Purpose Groove pancreatitis is a rare focal form of chronic pancreatitis that occurs in the pancreaticoduodenal groove between the major and minor papillae, duodenum and pancreatic head. Radiologic appearance and clinical presentation can result in suspicion of malignancy rendering pancreaticoduodenectomy inevitable. This study reports dual phase CT findings in a series of 12 patients with pathology proven groove pancreatitis. Materials and methods Retrospective review of preoperative CT findings in 12 patients with histologically proven groove pancreatitis after pancreaticoduodenectomy. Size, location, attenuation, presence of mass or cystic components in the pancreas, groove and duodenum, calcifications, duodenal stenosis and ductal changes were recorded. Clinical data, laboratory values, endoscopic ultrasonographic and histopathological findings were collected. Results Soft tissue thickening in the groove was seen in all patients. Pancreatic head, groove and duodenum were all involved in 75% patients. A discrete lesion in the pancreatic head was seen in half of the patients, most of which appeared hypodense on both arterial and venous phases. Cystic changes in pancreatic head were seen in 75% patients. Duodenal involvement was seen in 92% patients including wall thickening and cyst formation. The main pancreatic duct was dilated in 7 patients, with an abrupt cut off in 3 and a smooth tapering stricture in 4. Five patients had evidence of chronic pancreatitis with parenchymal calcifications. Conclusion Presence of mass or soft tissue thickening in the groove with cystic duodenal thickening is highly suggestive of groove pancreatitis. Recognizing common radiological features may help in diagnosis and reduce suspicion of malignancy. PMID:24935140

Zaheer, Atif; Haider, Maera; Kawamoto, Satomi; Hruban, Ralph H.; Fishman, Elliot K.

2015-01-01

42

Pulmonary Aspergillus chest wall involvement in chronic granulomatous disease: CT and MRI findings  

Microsoft Academic Search

Pulmonary Aspergillus infection in patients with chronic granulomatous disease tends to involve the chest wall and consequently carries a high mortality rate. We report the findings of computed tomography (CT) and magnetic resonance imaging (MRI) in three such cases. One patient underwent both CT and MRI, one, CT only, and one, MRI only. In all three, both CT and MRI

Akira Kawashima; Janet E. Kuhlman; Elliot K. Fishman; Clare M. Tempany; Donna Magid; Howard M. Lederman; Jerry A. Winkelstein; Elias A. Zerhouni

1991-01-01

43

A patient with features of albright hereditory osteodystrophy and unusual neuropsychiatric findings without coding Gsalpha mutations  

PubMed Central

Background Pseudohypoparathyroidism(PHP) is a heterogeneous group of rare metabolic disorders characterized by hypocalcemia and hyperphosphatemia resulting from PTH resistance. Different forms of PHP have been reported based on biochemical and clinical manifestation and genetic findings. Most of these forms are caused by defects in GNAS, an imprinted gene locus with multiple subunits. We reported a 12- year- old girl with unusual clinical manifestations of Pseudopseudohypoparathyroidism(PPHP). Methods After clinical and biochemical evaluations, the patients’ genomic DNA was isolated from peripheral blood leukocytes using salting out method. The whole coding sequences of GNAS gene including 13 exons were amplified by PCR. Quantitative PCR reactions were performed too. Findings We described a 12- year- old girl with Albright Hereditory osteodystrophy (AHO) phenotype, poor school performance, some abnormal movements, TSH resistance with normal serum calcium and phosphorus levels and normal Gs? bioactivity with no mutation in GNAS exons. Unusual neuropsychiatric findings in this patient were compatible with Asperger syndrome. Conclusions According to our findings this patient could not be categorized in any of PHP subgroups. Identifying of such individuals may be useful to discover different genetic patterns in pseudohypoparathyroidism and pseudopseudohypoparathyroidism. It is important to identify patients in whom PHP is caused by novel GNAS mutations, as careful investigations of these findings will likely further our knowledge of this complex and this unique disorder. In addition this case presented with unusual neuropsychiatric findings which has not been reported up to now. PMID:24959527

2014-01-01

44

Exogenous lipoid pneumonia: high-resolution CT findings.  

PubMed

The aim of this study was to assess high-resolution computed tomography (HRCT) findings of exogenous lipoid pneumonia. High-resolution computed tomography was obtained in 25 patients with proven exogenous lipoid pneumonia resulting from aspiration of squalene (derived from shark liver oil). Diagnosis was based on biopsy (n = 9), bronchoalveolar lavage (n = 8), or sputum cytology and clinical findings (n = 8). The clinical history of taking squalene was confirmed in all patients. The CT findings were classified into three patterns: diffuse ground-glass opacity, consolidation, and interstitial abnormalities. Distribution of the abnormalities, duration of taking squalene, predisposing factors for aspiration, and route of administration were analyzed. Ten patients showed diffuse ground-glass opacity pattern. Seven of 10 patients had predisposing conditions such as unconsciousness, pharyngeal dysmotility, or motor disturbances, and 6 patients had a recent history of taking large amount of squalene through nasal route. Seven patients who had consolidation pattern had a history of taking squalene for several months and did not have any predisposing factor. All of the 5 patients who had a pattern of interstitial abnormalities had a history of taking squalene longer than 1 year and showed segmental distribution of interstitial thickening with interposing ground-glass opacities. Three patients simultaneously had two different patterns at different lobes of the lung. The HRCT findings of lipoid pneumonia are ground-glass opacities, consolidation, and interstitial abnormalities. These HRCT findings with appropriate inquiries could be useful for diagnosis of exogenous lipoid pneumonia. PMID:10101652

Lee, J S; Im, J G; Song, K S; Seo, J B; Lim, T H

1999-01-01

45

Schistosomiasis Japonica of the Liver: Contrast-Enhanced CT Findings in 113 Patients  

Microsoft Academic Search

OBJECTIVE. The purpose of this study was to determine the findings on contrast- enhanced CT scans in patients with hepatic schistosomiasis japonica and to deter- mine their pathologic basis. MATERIALS AND METHODS. Unenhanced and contrast-enhanced CT scans of 113 patients with histologically proved schistosomiasis were reviewed. Radiologic and pathologic findings were correlated after autopsy In 19 patients. RESULTS. Unenhanced CT

Shuichi Monzawa; Guio Uchiyama; Kuni Ohtomo; Tsutomu Araki

46

Pulmonary coccidioidomycosis: pictorial review of chest radiographic and CT findings.  

PubMed

Pulmonary coccidioidomycosis is a fungal disease endemic to the desert regions of the southwestern United States, Mexico, Central America, and South America. The incidence of reported disease increased substantially between 1998 and 2011, and the infection is encountered beyond the endemic areas because of a mobile society. The disease is caused by inhalation of spores of Coccidioides species. Individuals at high risk are those exposed to frequent soil aerosolization. The diagnosis is established by direct visualization of mature spherules by using special stains or cultures from biologic specimens. Serologic testing of anticoccidioidal antibodies is used for diagnosis and treatment monitoring. The infection is self-limited in 60% of cases. When the disease is symptomatic, the lung is the primary site of involvement. On the basis of clinical presentation and imaging abnormalities, pulmonary involvement is categorized into acute, disseminated, and chronic forms, each with a spectrum of imaging findings. In patients with acute disease, the most common findings are lobar or segmental consolidation, multifocal consolidation, and nodules. Adenopathy and pleural effusions are also seen, usually in association with parenchymal disease. Disseminated disease is rare and occurs in less than 1% of patients. Pulmonary findings are miliary nodules and confluent parenchymal opacities. Acute respiratory distress syndrome is an infrequent complication of disseminated disease. The acute findings resolve in most patients, with chronic changes developing in approximately 5% of patients. Manifestations of chronic disease include residual nodules, chronic cavities, persistent pneumonia with or without adenopathy, pleural effusion, and regressive changes. Unusual complications of chronic disease are mycetoma, abscess formation, and bronchopleural fistula. Patients in an immunocompromised state, those with diabetes mellitus, pregnant women, and those belonging to certain ethnic groups may show severe, progressive, or disseminated disease. PMID:25019431

Jude, Cecilia M; Nayak, Nita B; Patel, Maitraya K; Deshmukh, Monica; Batra, Poonam

2014-01-01

47

Unusual findings in inguinal hernia surgery: Report of 6 rare cases  

PubMed Central

Background and aim: To present our experience with unexpected findings during hernia surgery, either unusual hernial contents or pathologic entities, like neoplastic masses, masquerading as a hernia. Patients and methods: We studied retrospectively 856 patients with inguinal hernia who were admitted to our surgical department over a 9-year period. In addition, our study included patients complaining of inguinal protrusion, even without a definitive diagnosis of inguinal hernia upon admission. Results: Five patients presented with unusual hernial contents. Three of them had a vermiform appendix in their sac. Acute appendicitis (Amyands hernia) was found in only one case. One patient had epiploic appendagitis related with a groin hernia. Moreover, an adult woman was diagnosed with ovarian and tubal inguinal hernia. Finally, we report a case of a massive extratesticular intrascrotal lipoma, initially misdiagnosed as a scrotal hernia. Conclusion: a hernia surgeon may encounter unexpected intraoperative findings. It is important to be prepared to detect them and apply the appropriate treatment. PMID:19918306

Ballas, K; Kontoulis, Th; Skouras, Ch; Triantafyllou, A; Symeonidis, N; Pavlidis, Th; Marakis, G; Sakadamis, A

2009-01-01

48

Three rounds as "tandem bullets": unusual findings in a case of a suicidal gunshot to the head.  

PubMed

We report an unusual case of suicide in which three 7.65 caliber projectiles were found in the single gunshot wound to the head of a 53-year-old man. Based on data collected at the death scene, CT scan, autopsy findings, and ballistics analysis, the events were reconstructed as follows: two 7.65 mm rounds had already been fired from the 9 mm Makarov pistol the subject was using but, being a smaller caliber, the cartridges had slipped forward and lodged within the barrel. When a third 7.65 mm cartridge was chambered and the gun fired for the third time, the nose of the last bullet hit the lodged bullets and all three rounds were propelled out of the muzzle in tandem as a single shot. Ballistic investigations confirmed that the kinetic energy of the three tandem bullets would have been sufficient to perforate the skull. In cases of gunshot wounds where the manner of death is unclear, a number of well-described circumstantial parameters, such as an atypical anatomical location of the gunshot, unusual firearm, or ammunition, as well as ambiguous autopsy findings, can raise doubts about the manner of death. In very rare cases, despite a single entrance wound, two or more bullets are recovered from the body, fired by the same weapon at the same time (the so-called "tandem bullet" phenomenon). Injuries by "tandem bullets" have crucial implications in gunshot deaths because of the mismatch between the number of entrance and exit wounds and the number of bullets found in or near the body. PMID:25091600

Tattoli, Lucia; Schmid, Simone; Tsokos, Michael

2014-12-01

49

Cervical and uterine metastasis from carcinoma of breast diagnosed by PET/CT: an unusual presentation.  

PubMed

A 44-year-old apparently healthy woman presented with a 5-month history of intermittent vaginal bleeding. Clinical examination raised the suspicion of cervical neoplasia which was confirmed to be a metastatic adenocarcinoma on subsequent histopathological evaluation. An F-18 FDG PET/CT scan performed soon after revealed increased uptake in the cervix, extending upwards into the endometrial cavity. Additionally, small FDG avid spiculated soft tissue density masses were visualized in bilateral breast parenchyma, which proved to be lobular carcinoma on sonomammography followed by histopathology. Multiple lytic FDG avid skeletal metastases were also noted. Endometrial biopsy showed infiltrative malignant tumor with cytologic features similar to those observed in the breast biopsy specimen. The entire spectrum of findings pointed to a diagnosis of bilateral lobular carcinoma with uterine, cervical, and skeletal metastasis. Metastasis to the uterus and cervix from a breast primary is extremely rare. Most cases have been diagnosed in the follow-up of known cases of breast carcinoma. Our case is unique in that the patient, who had no prior history of breast carcinoma, was suspected to have a breast primary with cervical and uterine metastasis, based on the PET/CT findings. PMID:20838299

D'souza, Maria M; Sharma, Rajnish; Tripathi, Madhavi; Saw, Sanjiv Kumar; Anand, Anuja; Singh, Dinesh; Mondal, Anupam

2010-10-01

50

Pulmonary Tuberculosis Confirmed by Percutaneous Transthoracic Needle Biopsy: Analysis of CT Findings and Review of Correlations with Underlying Lung Disease  

PubMed Central

Background: Pulmonary tuberculosis (TB) can produce unusual radiographic findings. Further, negative sputum and bronchoscopic results are common. Early diagnosis is equally as significant as treatment in the reduction of morbidity and mortality associated with pulmonary TB. Aims: The aim of this study was to assess computed tomography (CT) findings of pulmonary TB, confirmed via percutaneous transthoracic needle biopsy (PTNB), and to correlate these findings with coexisting, underlying, lung diseases if present. Study Design: Cross sectional study. Methods: We selected eighty-four patients who were diagnosed with pulmonary TB by way of PTNB. Initially, acid-fast bacilli smear test results from these patients were negative. CT findings were reviewed to detect the presence of parenchymal abnormalities as follows: nodule(s) (<3 cm in diameter), mass (any masses ?3 cm), daughter nodules, air-space consolidation, cavitation, calcification, lymphadenopathy, mediastinal lymphadenopathy, and associated lung parenchymal disease. Results: The CT findings of pulmonary TB confirmed by PTNB included nodules in 44 of 84 (52.4%) cases; 15 of these 44 cases (34.1%) had daughter nodules. The second most common finding was masses in 24 cases (28.6%), nine of which also had daughter nodules. 16 cases (19.0%) displayed nonsegmental consolidation. Of these 16 cases, four had coexisting usual interstitial pneumonia; four others had emphysema. Two patients with a mass had underlying pneumoconiosis. Conclusion: Nodules or a mass mimicking lung cancer were the most common findings on CT scans in patients with pulmonary TB, confirmed via PTNB. The second most common finding was airspace consolidation. Therefore, PNTB is useful for the accurate diagnosis of pulmonary TB in the following cases: airspace consolidation or mass associated with underlying usual interstitial pneumonia, emphysema mimicking lung malignancy or cases of bacterial pneumonia.

Choo, Ji Young; Lee, Ki Yeol; Kim, Mi-young; Kang, Eun-young; Oh, Yu Whan; Lee, Seung Hwa; Seo, Bo Kyung; Je, Bo Kyung

2014-01-01

51

Postoperative findings following the Whipple procedure: determination of prevalence and morphologic abdominal CT features  

Microsoft Academic Search

.   This study was conducted to determine characteristic CT findings following the Whipple procedure and to evaluate the usefulness\\u000a of CT in predicting tumor recurrence. Eighty-four postoperative abdominal CT scans and medical records of 43 patients were\\u000a retrospectively reviewed. Perioperative histopathologic examinations revealed malignancy in 32 patients (74.4 %). Time interval\\u000a between surgery and CT varied from 13 days to

K. J. Mortelé; M. Lemmerling; B. de Hemptinne; M. De Vos; G. De Bock; M. Kunnen

2000-01-01

52

CT Findings During Phase of Accelerated Deterioration in Patients with Idiopathic Pulmonary Fibrosis  

Microsoft Academic Search

OBJECTIVE. Most patients with idiopathic pulmonary fibrosis (IPF) show slowly pro- gressive deterioration. However, accelerated deterioration also occurs in patients with IPF who have previously shown slowly progressive deterioration. The purpose of this study was to evaluate the CT findings of accelerated deterioration in patients with IPF. MATERIALS AND METHODS. We evaluated the CT findings of I 7 patients with

Masanori Akira; Hironobu Hamada; Mitsunori Sakatani; Chikako Kobayashi; Michiho Nishioka; Satoru Yamamoto

53

Dynamic CT and MRA findings of a case of portopulmonary venous anastomosis (PPVA) in a patient with portal hypertension: a case report and review of the literature.  

PubMed

Portopulmonary venous anastomosis (PPVA), which has been rarely reported in conventional CT and MR studies, is an unusual collateral pathway in patients with portal hypertension. It has clinical implications related to right-to-left shunt that are different from the clinical implications related to other more usual portosystemic shunts in portal hypertensive patients. Here, we report the dynamic CT and MRA findings of a case of PPVA in a patient with portal hypertension, directly demonstrating the shunt flow from the paraesophageal varix to the left atrium via the right inferior pulmonary vein. PMID:21498289

Ko, Jeong Min; Ahn, Myeong Im; Han, Dae Hee; Jung, Jung Im; Park, Seog Hee

2011-06-01

54

Usual and unusual neuroendocrine tumor metastases on (68)Ga-DOTANOC PET/CT: a pictorial review.  

PubMed

Neuroendocrine tumors (NETs) are slow-growing indolent tumors that often present with metastatic disease at the outset. They commonly metastasize to lymph nodes, liver, bone, and lungs. However, metastasis to other rare sites may occur. It is important to have clear knowledge of unusual NET metastatic sites because their presence may lead to a more directed investigation. Also, it will be helpful in ruling out incidental second malignancies that might be encountered. The objective of this pictorial article was to provide an illustrative tutorial showing the clinical utility of Ga-labeled somatostatin analog [1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 10-tetraacetic acid]-1-NaI3-octreotide (Ga-DOTANOC) PET/CT for imaging usual and unusual metastatic sites in patients with NETs. PMID:23235484

Naswa, Niraj; Sharma, Punit; Kumar, Rakesh; Malhotra, Arun; Bal, Chandrasekhar

2013-06-01

55

Spontaneous vertebral dissection: Clinical, conventional angiographic, CT, and MR findings  

SciTech Connect

The purpose of this study was to determine if typical clinical and neuroradiologic patterns exist in patients with spontaneous vertebral artery (VA) dissection. The medical records and neuroradiologic examinations of 14 patients with spontaneous VA dissection were reviewed. The medical records were examined to exclude patients with a history of trauma and to record evidence of a nontratimatic precipitating event ({open_quotes}trivial trauma{close_quotes}) and presence of possible risk factors such as hypertension. All patients under-went conventional angiography, 13 either CT or MRI (II both CT and MRI), and 3 MRA. Conventional arteriograrris were evaluated for dissection site, evidence of fibromuscular dysplasia, luminal stenosis or occlusion, and pseudoaneurysm formation, CT examinations for the presence of infarction or subarachnoid hemorrhage, MR examinations for the presence of infarction or arterial signal abnormality, and MR angiograms for abnormality of the arterial signal column. Seven patients had precipitating events within 24 h of onset of symptoms that may have been causative of dissection and five had hypertension. At catheter angiography, two patients had dissections in two arteries (both VAs in one patient, VA and internal carotid artery in one patient), giving a total of 15 VAs with dissection. Dissection sites included V1 in four patients, V2 in one patient, V3 in three patients, V4 in six patients, and both V3 and V4 in one patient. Luminal stenosis was present in 13 VAs, occlusion in 2, pseudoaneurysm in 1, and evidence of fibromuscular dysplasia in 1. Posterior circulation infarcts were found on CT or MR in five patients. Subarachnoid hemorrhage was found on CT in two patients and by lumbar puncture alone in two patients. Abnormal periarterial signal on MRI was seen in three patients. MRA demonstrated absent VA signal in one patient, pseudoaneurysm in one, and a false-negative examination in one.

Provenzale, J.M.; Morgenlander, J.C. [Duke Univ. Medical Center, Durham, NC (United States)] [Duke Univ. Medical Center, Durham, NC (United States); Gress, D. [Univ. of California, San Francisco, CA (United States)] [Univ. of California, San Francisco, CA (United States)

1996-03-01

56

Incidental Findings on Simulation CT Images for Adjuvant Radiotherapy in Breast Cancer Patients.  

PubMed

We designed this study to evaluate the incidence of incidental findings on computed tomography (CT) scan implemented as simulation for adjuvant radiotherapy in breast cancer patients and to emphasize the need for careful review of simulation CT images before planning radiotherapy. A Resident and attending radiation oncologists retrospectively reviewed the medical records and simulation CT images of 776 patients treated with adjuvant radiotherapy at Samsung Medical Center during 2008. Previously undetected abnormal findings on simulation CT images were defined as incidental findings and interpreted by diagnostic radiologist. If the incidental findings required further evaluation or follow-up, they were defined as indeterminate findings. If subsequent cancers were diagnosed according incidental findings, they were defined as malignancy-related findings. There were 81 indeterminate findings (10.8%) including thyroid nodule, solitary pulmonary nodule, mediastinal lymph node, supraclavicular or axillary lymph node. Among them, there were nine malignancy-related findings (1.3%), including four thyroid cancers, three lung metastases, one primary lung cancer, and one axillary lymph node recurrence. The incidence of incidental findings in this study was low, but some of the findings were related to malignancy. Radiation oncologists should be alert to incidental findings on simulation CT, and incidental findings should be evaluated by diagnostic radiologists. PMID:24645749

Park, J S; Choi, D H; Huh, S J; Park, W; Nam, S J; Lee, J E; Kil, W H; Lee, K S

2014-03-17

57

Fibroepithelial Polyp of the Bronchus: CT and Histopathologic Findings  

PubMed Central

A fibroepithelial polyp of the bronchus is a rare, benign, and endobronchial tumor, histologically consisting of fibrovascular stroma covered by normal respiratory epithelium. We report a case of a fibroepithelial polyp arising from the left main bronchus. On CT, a characteristic lobulating contour of the endobronchial nodule was well visualized, which histopathologically represented a typical papillary growth pattern of the nodule. Such a lobulating contour of the nodule might help make a correct diagnosis of this rare disease among other various endobronchial neoplasms. PMID:22563275

Kang, Hee; Han, Joungho; Kim, Hojoong

2012-01-01

58

An unexpected CT finding in a patient with abdominal pain  

PubMed Central

A fit and well 16-year-old girl presented to the emergency department with signs and symptoms suggestive of appendicitis. A transabdominal ultrasound scan revealed a normal appendix but there was significant free fluid in the pelvis. Consequently, a CT scan of her abdomen was performed which showed mucosal oedema and inflammation involving virtually the entire length of her large bowel (the ‘accordion sign’). Clostridium difficile colitis was thus suspected; however, the toxin was not detected in her stool. The patient was treated conservatively with intravenous fluids and antibiotics and had an uneventful recovery. She was subsequently discharged home 3?days later with a full recovery. In this case, the radiological appearance of the accordion sign which is traditionally known to be pathognomonic of pseudomembranous colitis, reveals that it may also be indicative of severe colonic luminal inflammation. PMID:23345475

Lim, Jeffrey; Phillips, Alexander W; Thomson, Wendy L

2013-01-01

59

Lung findings on high resolution CT in early ankylosing spondylitis  

Microsoft Academic Search

Objective: Ankylosing spondylitis (AS) is a chronic inflammatory disease mainly affecting the axial skeleton and pulmonary involvement is a well known feature of the disease. The aim of this study was to investigate the pulmonary high resolution computed tomography (HRCT) findings of patients with early AS. The relationship between pulmonary function tests (PFT) and HRCT findings was also determined. Subjects

Adem Kiris; Salih Ozgocmen; Ercan Kocakoc; Ozge Ardicoglu; Erkin Ogur

2003-01-01

60

CT Findings in Acute, Subacute, and Chronic Ischemic Colitis: Suggestions for Diagnosis  

PubMed Central

Purpose. This paper aims at evaluating CT findings of occlusive and nonocclusive ischemic colitis (IC), in correlation with the etiology and the different phases of the disease. Materials and Methods. CT examination and clinical history of 32 patients with proven IC were retrospectively reviewed. The CT findings were analyzed according to the different phases of the disease (acute, subacute, and chronic). Results. Among the 32?CT examinations performed in the acute phase, 62.5% did not present signs of occlusion of the superior mesenteric artery (SMA) or inferior mesenteric artery (IMA), whereas IMA occlusion was detected in 37.5% of CT examinations. In the acute phase, the presence of pericolic fluid was found in 100% of patients undergoing progressive resorption from acute to subacute phase if an effective reperfusion occurred; the bowel wall thickening was observed in 28.1% patients in acute phase and in 86.4% patients evaluated in subacute phase. The unthickened colonic wall was found in all conditions where ischemia was not followed by effective reperfusion (71.9% of cases), and it was never found in chronic phase, when the colon appeared irregularly thickened. Conclusion. CT allows determining the morphofunctional alterations associated with the IC discriminating the occlusive forms from the nonocclusive forms. CT, furthermore, allows estimating the timing of ischemic damage. PMID:25247191

Iacobellis, Francesca; Berritto, Daniela; Fleischmann, Dominik; Gagliardi, Giuliano; Brillantino, Antonio; Mazzei, Maria Antonietta; Grassi, Roberto

2014-01-01

61

MRI and FDG PET/CT findings in 3 cases of spinal infectious arachnoiditis.  

PubMed

Spinal arachnoiditis is a disease characterized by inflammation and scarring of the arachnoid membrane of the spinal cord. FDG PET/CT findings of spinal arachnoiditis have been rarely reported. We present 3 cases of spinal infectious arachnoiditis (1 pyogenic and 2 tuberculous). MRI was performed in these 3 cases showing thickened spinal meninges with marked enhancement. FDG PET/CT was performed in 2 cases showing intense linear FDG uptake along the spinal canal. The combination of MRI and FDG PET/CT may be helpful in identifying the infectious sites and evaluating the activity of the infection. PMID:24321827

Dong, Aisheng; Zuo, Changjing; Zhang, Ping; Lu, Jianping; Bai, Yushu

2014-10-01

62

Accumulation of PBDEs in an urban river otter population and an unusual finding of BDE-209.  

PubMed

River otter scat samples (n = 77) and blood samples (n = 16) collected through non-invasive field collections and live-capture activities (November 2009 to October 2010) along the coastline of Southern Vancouver Island, near Victoria, British Columbia (BC) were analyzed for polybrominated diphenyl ethers (PBDEs). ?PBDEs were highest in urbanized regions of Victoria Harbour for blood (1.12 ?g/g lipid weight) and scat (0.35 ?g/g lipid weight). A location effect between zones was confirmed statistically for blood but not for scat. Specific congeners with the highest concentrations overall were BDE-47 in blood samples (0.37 ?g/g lipid weight) and BDE-206 (0.18 ?g/g lipid weight) and BDE-47 (0.16 ?g/g lipid weight) in scat samples. There was also an unusual finding of extremely high levels of BDE-209 in 2 scat samples (163 and 956 ?g/g lipid weight). The patterns of select congeners (BDE 47, 99, 100, 153, 154) measured in blood and scat were found not to be significantly different (Chi-square Test, X2 = 21.08, DF = 4, p = 0003). The most prominent congeners within Victoria Harbour were BDE-47 for both blood (0.82 mg/kg lipid weight) and scat (0.26 mg/kg lipid weight) followed by BDE-206 (0.18 ?g/g lipid weight) and BDE-207 (0.10 ?g/g lipid weight) for scat only. Comparable levels of BDE-47 were reported across the study area whereas BDE 206 and 207 were only observed in Victoria Harbour (scat). Toxicological effects of PBDEs in rivers otters from Victoria, BC are still unknown however the predominance of BDE-47 could have negative implication as an endocrine disruptor. PMID:25463257

Nelson, Cait; Drouillard, Ken; Cheng, Kimberly; Elliott, John; Ismail, Nargis

2015-01-01

63

FDG PET/CT in Evaluation of Unusual Cutaneous Manifestations of Breast Cancer.  

PubMed

Cutaneous metastases of primary internal malignancies are rare, with an incidence of 0.7% to 10.4%. Cutaneous manifestations due to breast cancer are the most common metastases dermatologists observe, with a prevalence of 2.4% and an incidence of 23.9%. Presence of cutaneous metastases is usually a late event in disease progression, indicating grave prognosis. Recognition of cutaneous breast cancer metastases significantly alters therapeutic plans, especially when the disease was thought to be successfully cured. F-FDG PET CT imaging can detect cutaneous metastasis and sites of distant metastases and monitor response to therapy. We report 3 patients with cutaneous-predominant breast carcinoma seen by FDG PET/CT. PMID:25140546

Dave, Shaylee R; Samuel, Thomas A; Pucar, Darko; Savage, Natasha; Williams, Hadyn T

2015-01-01

64

An unreported anatomical finding: unusual insertions of the stylohyoid and digastric muscles.  

PubMed

The presence of a unusual appearance of the stylohyoid and digastric muscles may lead to a confusion in some pathological cases, during the radiological examination and aesthetic facial surgery. These differences may cause pharyngeal pain and foreign body sensation in the throat. During the dissection, unusual insertions, origin, insertion, shape and bilaterality were investigated in 28 cadavers' heads. In a total of 56, the presence of unusual insertions which belong to the stylohyoid muscle were observed in 22 sides (39.3%), and atypical fibers which belong to the digastric muscle were observed in 39 sides (69.6%). Bilaterality of the presence of atypical appearance was observed for stylohyoid and digastric muscles, in 10 (35.7%) and 19 (67.8%) specimens, respectively. In 12 heads (42.9%), atypical fibers, the stylohyoid and the digastric coexisted. These fibers which were shaped like a circular spiral were realized to have the shape of an arch or circle in front of the hyoid bone. The posterior bellies of the digastric muscle, the mylohyoid and the remaining suprahyoid muscles of both sides were normal. The unusual insertion of the stylohyoid muscles which cover the hyoid bone as a collar was not described in the classification of the previous studies. These fibers may give an variant mobility to the hyoid and they occur depending on the differences in the stylohyoid chains. Although the styloid process was in normal size, unusual insertions of the stylohyoid muscle that cover the hyoid as a belt or collar may give symptoms similar to those of the stylohyoid syndrome. PMID:19763380

Ozgur, Zuhal; Govsa, Figen; Celik, Servet; Ozgur, Tomris

2010-06-01

65

Oligodendroglioma with neurocytic differentiation versus atypical extraventricular neurocytoma: a case report of unusual pathologic findings of a spinal cord tumor  

Microsoft Academic Search

Differentiating oligodendroglioma from extraventricular neurocytoma by conventional light microscopy alone can present a diagnostic\\u000a challenge. We report pathologic findings of an unusual spinal cord tumor from a 33-year-old male patient which showed hybrid\\u000a features of oligodendroglioma and extraventricular neurocytoma. Magnetic resonance imaging (MRI) showed an enhancing intramedullary\\u000a mass in the cervicothoracic region (C7 through T6). Histologic examination revealed a clear

Addisalem T. Makuria; Fraser C. Henderson; Elisabeth J. Rushing; Dan-Paul Hartmann; Norio Azumi; Metin Ozdemirli

2007-01-01

66

CT and US findings of ovarian torsion within an incarcerated inguinal hernia.  

PubMed

Inguinal hernia is relatively common in children. Although inguinal hernia is not frequently encountered in girls in comparison to boys, there are occasional cases of uterine or ovarian herniation in female indirect inguinal hernia. Incarcerated ovary in hernia sac has the risk of torsion and strangulation. We present an 8-year-old girl with painful mass in her left groin. With computed tomography (CT) and ultrasonography (US), we made the diagnosis of ovarian strangulation within an incarcerated inguinal hernia. Since ultrasound is primarily used for evaluation of groin mass, CT findings of an incarcerated inguinal hernia is rarely reported. PMID:24917391

Hyun, Park Mee; Jung, Ah Young; Lee, Yul; Yang, Ik; Yang, Dae Hyun; Hwang, Ji-Young

2015-02-01

67

Stability of CT scan findings in schizophrenia: results of an 8 year follow-up study.  

PubMed Central

Earlier cross-sectional studies have suggested that CT findings of ventricular enlargement and increased cortical markings in schizophrenic patients are not progressive, but individual patients have rarely been followed prospectively. Fifteen patients with chronic schizophrenia were rescanned on the same model machine after 7 to 9 years of continuous illness and, in seven cases, of continuous hospitalisation. It was not possible to demonstrate significant changes in either ventricular-brain ratio or frontal atrophy scores. These results suggest that the pathologic process responsible for CT changes in schizophrenia is static and is not affected by 8 years of neuroleptic medication and institutionalisation. Images PMID:3346684

Illowsky, B P; Juliano, D M; Bigelow, L B; Weinberger, D R

1988-01-01

68

Aorta-Left Renal Vein Fistula Complicating an Aortic Aneurysm: Preoperative and Postoperative Multislice CT Findings  

SciTech Connect

Fistulas complicating an abdominal aortic aneurysm (AAA) are rare, and fistulas involving the left renal vein are particularly uncommon. We highlight here a fistula between an infrarenal aortic aneurysm and a retroaortic left renal vein, revealed by left flank pain associated with hematuria and acute renal failure. The multislice CT angiography performed in this 68-year-old patient revealed communication and equal enhancement between the aorta and the left gonadic vein, suggesting the presence of a fistula. The three-dimensional VRT reconstructions presented in this case were of great value in the preoperative planning, enabling immediate visualization of this unusual feature. Alternative diagnoses to consider when encountering this clinical presentation are reviewed.

Barrier, Pierre, E-mail: p.barrier@gmail.com; Otal, Philippe [Hopital de Rangueil CHU de Toulouse, Department of Radiology (France); Garcia, Olivier; Vahdat, Olivier; Domenech, Brice [Clinique Pasteur, Department of Radiology (France); Lannareix, Valerie; Joffre, Francis; Rousseau, Herve [Hopital de Rangueil CHU de Toulouse, Department of Radiology (France)

2007-06-15

69

CT demonstration of a 5th ventricle--a finding to KO boxers?  

PubMed

The reported prevalence of 5th ventricles based on air studies varies from 1-12% and ranges up to 60% as an autopsy finding. The prevalence of what is usually an incidental anomaly has not been determined by computed tomography (CT). 5th ventricles are however known to be more common in brain damaged boxers and with the introduction of compulsory CT scanning for certain boxers it is necessary to know what significance to attach to the finding of a cavum in these individuals. To ascertain the prevalence and morphology of 5th ventricles as detected by CT in the population, a thousand consecutive scans were analysed for the presence or absence of a 5th ventricle and other associated midline developmental abnormalities and correlations made with any pathology found. A 5th ventricle was present in 5.5% of the group and in most cases was less than 3 mm wide. An apparent association with other pathology was found only in patients under the age of 15. A 6th ventricle was found in 0.5% while a cavum velum interpositum was present in 9.5%. The isolated finding of a small 5th ventricle on the CT scan of a young active boxer almost certainly represents a persistent congenital anomaly of no significance. PMID:3265765

Macpherson, P; Teasdale, E

1988-01-01

70

Pulmonary involvement in Churg-Strauss syndrome: an analysis of CT, clinical, and pathologic findings.  

PubMed

We tried to assess retrospectively thin-section CT findings of Churg-Strauss syndrome (CSS) in 25 patients and to compare these findings with clinical and histopathologic findings. Of 25 patients, 19 (76%) had parenchymal abnormalities at CT; small nodules (n = 12; 63%), ground-glass opacity (n = 10; 53%), bronchial wall thickening (n = 10; 53%), and consolidation (n = 8; 42%). Parenchymal abnormalities (n = 19) were categorizable as an airway pattern in 11 and an airspace pattern in eight. Patients with an airway pattern (n = 5) had obstructive (n = 3) or combined (n = 2) PFT results, whereas those with an airspace pattern (n = 4) had restrictive (n = 3) or obstructive (n = 1) results. Parenchymal opacities at CT corresponded histologically to areas of eosinophilic pneumonia, necrotizing granulomas, and granulomatous vasculitis; small nodules to eosinophilic bronchiolitis and peribronchiolar vasculitis; and bronchial wall thickening to airway wall eosinophil and lymphocyte infiltration. Patients with airspace pattern responded more readily to treatment than those with airway pattern. CT shows lung parenchymal abnormalities in about three-quarters of CSS patients and these abnormalities can be categorized as airspace or airway patterns. This classification helps predict PFT data, underlying histopathology, and treatment response. PMID:17605012

Kim, Yoon Kyung; Lee, Kyung Soo; Chung, Man Pyo; Han, Joungho; Chong, Semin; Chung, Myung Jin; Yi, Chin A; Kim, Ha Young

2007-12-01

71

Samonella-and Shigella-induced ileitis: CT findings in four patients  

SciTech Connect

The purpose of this study is to describe and illustrate the CT appearance of four cases of acute terminal ileitis induced by nontyphoidal Salmonella and Shigella infection and to review the radiographic and endoscopic findings of these entities. The medical records, CT examinations, and small bowel examinations of three patients with Salmonella ileitis and one patient with Shigella ileitis were retrospectively reviewed. CT examinations were done in four patients, colonoscopy in three patients, and small bowel examinations in two patients. Stool cultures established the diagnosis of nontyphoidal Salmonella enteritis in three patients and Shigella enteritis in one patient. The patients symptoms and clinical findings resolved promptly following supportive therapy and appropriate antibiotic therapy. CT showed slight circumferential and homogeneous thickening of the terminal ileum over a segment of 10-15 cm in patients with Salmonella ileitis. Associated mild thickening of the wall of the colon was present in addition. Small bowel examination performed in one patient revealed a spastic terminal ileum with thickened mucosal folds. Colonoscopy revealed acute colitis involving the colon diffusely in one case, but sparing the distal 50 cm of the colon in one case. CT showed more pronounced thickening of the terminal ileum and a target configuration in the patient with Shigella ileitis. Small bowel examination revealed narrowing, irregular contour, several large nodular defects, and a severely ulcerated mucosa affecting the terminal ileum. Colonoscopy revealed a normal colon and large ulcerations with fibro-purulent exudate in the terminal ileum. In patients with severe Salmonella or Shigella infections or persistent and/or confusing clinical presentations, CT can play a complementary but important role in the initial diagnostic evaluation. 20 refs., 2 figs.

Balthazar, E.J.; Charles, H.W.; Megibow, A.J. [New York Univ. Tisch-Bellevue Medical Center, New York, NY (United States)] [New York Univ. Tisch-Bellevue Medical Center, New York, NY (United States)

1996-05-01

72

Computed Tomography Findings of an Unusual Maxillary Sinus Mass: Brown Tumor Due to Tertiary Hyperparathyroidism  

PubMed Central

Brown tumor is a non-neoplastic bone lesion that develops secondary to hyperparathyroidism and it is very rare in the maxillofacial region. We report the case of a 59-year-old man who presented with pain and a swelling in the left cheek. Computed tomography (CT) demonstrated an expansile and radioluscent lesion in the left maxillary sinus. Incisional biopsy was performed, and the diagnosis was Brown tumor. Brown tumor must be considered in the differential diagnosis of expansile lesions of maxillary sinus. PMID:24404414

Altay, Canan; Erdo?an, Nezahat; Eren, Erdem; Altay, Sedat; Karasu, ?ebnem; Uluç, Engin

2013-01-01

73

18 F-FDG PET\\/CT findings of sinonasal inverted papilloma with or without coexistent malignancy: comparison with MR imaging findings in eight patients  

Microsoft Academic Search

Introduction  Sinonasal inverted papilloma (IP) is known for high rate of associated malignancy. The purpose of this study was to identify\\u000a 18F-FDG PET\\/CT findings of sinonasal IPs. We also tried to compare the PET\\/CT findings with the MR imaging findings.\\u000a \\u000a \\u000a \\u000a Methods  We retrospectively reviewed PET\\/CT and MR images of eight patients with sinonasal IP with (n?=?6) or without (n?=?2) coexistent squamous cell

Tae Yeon Jeon; Hyung-Jin Kim; Joon Young Choi; In Ho Lee; Sung Tae Kim; Pyoung Jeon; Keon Ha Kim; Hong Sik Byun

2009-01-01

74

Impact of chest CT on the clinical management of immunocompetent emergency department patients with chest radiographic findings of pneumonia  

Microsoft Academic Search

The purpose of this study is to assess the impact on clinical decision making of chest computed tomography (CT) in immunocompetent\\u000a emergency department (ED) patients with chest radiographic (CXR) findings of pneumonia. We retrospectively identified 1,373\\u000a patients from our ED who underwent chest CT between 7\\/05 and 6\\/06. Report of CXR within 24 h before CT were reviewed to identify\\u000a patients

Piyush D. Banker; Vineet R. Jain; Linda B. Haramati

2007-01-01

75

Visual Assessment of CT Findings in Smokers With Nonobstructed Spirometric Abnormalities in The COPDGene(®) Study.  

PubMed

Within the COPD Genetic Epidemiology (COPDGene(®)) study population of cigarette smokers, 9% were found to be unclassifiable by the Global Initiative for chronic Obstructive Lung Disease (GOLD) criteria. This study was to identify the differences in computed tomography (CT) findings between this nonobstructed (GOLDU) group and a control group of smokers with normal lung function. This research was approved by the institutional review board of each institution. CT images of 400 participants in the COPDGene(®) study (200 GOLDU, 200 smokers with normal lung function) were retrospectively evaluated in a blinded fashion. Visual CT assessment included lobar analysis of emphysema (type, extent), presence of paraseptal emphysema, airway wall thickening, expiratory air trapping, centrilobular nodules, atelectasis, non-fibrotic and fibrotic interstitial lung disease (ILD), pleural thickening, diaphragmatic eventration, vertebral body changes and internal thoracic diameters (in mm). Univariate comparisons of groups for each CT parameter and multiple logistic regression were performed to determine the imaging features associated with GOLDU. When compared with the control group, GOLDU participants had a significantly higher prevalence of unilateral diaphragm eventration (30% vs. 16%), airway wall thickening, centrilobular nodules, reticular abnormality, paraseptal emphysema (33% vs. 17%), linear atelectasis (60% vs. 35.6%), kyphosis (12% vs. 4%), and a smaller internal transverse thoracic diameter (255 ± 22.5 [standard deviation] vs. 264.8 ± 22.4, mm) (all p<0.05). With multiple logistic regression, all of these CT parameters, except non-fibrotic ILD and kyphosis, remained significantly associated with GOLDU status (p<0.05). In cigarette smokers, chest wall abnormalities and parenchymal lung disease, which contribute to restrictive physiologic impairment, are associated with GOLD-nonobstructed status. PMID:25197723

Kim, Song Soo; Yagihashi, Kunihiro; Stinson, Douglas S; Zach, Jordan A; McKenzie, Alexander S; Curran-Everett, Douglas; Wan, Emily S; Silverman, Edwin K; Crapo, James D; Lynch, David A

2014-01-01

76

Visual Assessment of CT Findings in Smokers With Nonobstructed Spirometric Abnormalities in The COPDGene® Study  

PubMed Central

Within the COPD Genetic Epidemiology (COPDGene®) study population of cigarette smokers, 9% were found to be unclassifiable by the Global Initiative for chronic Obstructive Lung Disease (GOLD) criteria. This study was to identify the differences in computed tomography (CT) findings between this nonobstructed (GOLDU) group and a control group of smokers with normal lung function. This research was approved by the institutional review board of each institution. CT images of 400 participants in the COPDGene® study (200 GOLDU, 200 smokers with normal lung function) were retrospectively evaluated in a blinded fashion. Visual CT assessment included lobar analysis of emphysema (type, extent), presence of paraseptal emphysema, airway wall thickening, expiratory air trapping, centrilobular nodules, atelectasis, non-fibrotic and fibrotic interstitial lung disease (ILD), pleural thickening, diaphragmatic eventration, vertebral body changes and internal thoracic diameters (in mm). Univariate comparisons of groups for each CT parameter and multiple logistic regression were performed to determine the imaging features associated with GOLDU. When compared with the control group, GOLDU participants had a significantly higher prevalence of unilateral diaphragm eventration (30% vs. 16%), airway wall thickening, centrilobular nodules, reticular abnormality, paraseptal emphysema (33% vs. 17%), linear atelectasis (60% vs. 35.6%), kyphosis (12% vs. 4%), and a smaller internal transverse thoracic diameter (255 ± 22.5 [standard deviation] vs. 264.8 ± 22.4, mm) (all p<0.05). With multiple logistic regression, all of these CT parameters, except non-fibrotic ILD and kyphosis, remained significantly associated with GOLDU status (p<0.05). In cigarette smokers, chest wall abnormalities and parenchymal lung disease, which contribute to restrictive physiologic impairment, are associated with GOLD-nonobstructed status. PMID:25197723

Kim, Song Soo; Yagihashi, Kunihiro; Stinson, Douglas S.; Zach, Jordan A.; McKenzie, Alexander S.; Curran-Everett, Douglas; Wan, Emily S.; Silverman, Edwin K.; Crapo, James D.; Lynch, David A.

2014-01-01

77

Radiologic Findings in Cutis Laxa Syndrome and Unusual Association with Hypertrophic Pyloric Stenosis  

PubMed Central

Cutis laxa (CL) is a rare congenital and acquired disorder characterized by loose and redundant skin with reduced elasticity. Three types of congenital cutis laxa have been recognized. Other findings are pulmonary emphysema, bronchiectasia, hernia and diverticulosis. We describe a female neonate involved by cutis laxa syndrome and a positive family history. We focus on the radiologic findings of this case such as multiple bladder diverticulosis, GI diverticulosis and very rare accompanying hypertrophic pyloric stenosis (HPS). PMID:24046787

Alehossein, Mehdi; Pourgholami, Masoud; Kamrani, Kamyar; Soltani, Mohammad; Yazdi, Afshin; Salamati, Payman

2013-01-01

78

Spiral CT and endoscopic findings in a case of tracheobronchopathia osteochondroplastica.  

PubMed

The following is a report of CT and bronchoscopic findings in a 58-year-old man, a miner for approximately 30 years and suffering from pulmonary silicosis, admitted for a restaging of his lung disease. CT scans showed thickening of the interstitial structures and revealed a distorted trachea, with changes of its caliber, because of nodules of calcific density in the internal mucosa, clearly separated from the cartilaginous rings. The patient underwent fiberoptic bronchoscopy, confirming the presence of numerous nodules on the anterior and lateral walls, sparing the pars membranacea. Brushing and biopsies revealed a squamous metaplasia. 99mTc bone scintigraphy showed no abnormal mediastinal uptake. The radiological and endoscopic picture was compatible with the diagnosis of tracheobronchopathia osteochondroplastica. PMID:9135651

Mariotta, S; Pallone, G; Pedicelli, G; Bisetti, A

1997-01-01

79

Tumor Recurrence After Radiofrequency Thermal Ablation of Hepatic Tumors: Spectrum of Findings on Dual-Phase Contrast Enhanced CT  

Microsoft Academic Search

OBJECTIVE. We conducted this study to determine the spectrum of CT findings of tumor recurrence after radiofrequency ablation of primary and secondary malignant hepatic tumors. MATERIALS AND METHODS. Twenty-five patients, 10 with hepatocellular carcinoma (HCC) and 15 patients with metastases who developed tumor recurrence after radiofrequency ab- lation of hepatic neoplasms, formed the study population. Three observers reviewed the CT

Shailendra Chopra; Gerald D. Dodd III; Kedar N. Chintapalli; John R. Leyendecker; Okkes I. Karahan; Hyunchul Rhim

80

Radiologists’ performance in the diagnosis of acute intestinal ischemia, using MDCT and specific CT findings, using a variety of CT protocols  

Microsoft Academic Search

The aim of this study was to evaluate the performance of radiologists in the diagnosis of acute intestinal ischemia using\\u000a specific multi-detector CT findings. The abdominal CT scans of 90 patients were retrospectively reviewed by three radiologists:\\u000a an abdominal imaging specialist, an experienced general radiologist, and a senior resident. Forty-seven patients had surgically\\u000a proven intestinal ischemia and comprised the case

Arye Blachar; Sophie Barnes; Sharon Z. Adam; Gad Levy; Iuliana Weinstein; Ronit Precel; Michael P. Federle; Jacob Sosna

81

Interpretation of PET/CT findings in patients with advanced lung cancer who have undergone pleurodesis  

PubMed Central

A consensus has not yet been reached for the ideal moment to carry out pleurodesis in patients with malignant pleural effusion among the majority of centres, especially those which don’t specialise in oncologic treatment. The PET (positron emission tomography)/CT (computed tomography) used in the staging of patients with non-small-cell lung cancer (NSCLC) and small-cell lung cancer (SCLC) has caused controversy when used in the evaluation of therapeutical response and in detection of recurrence in patients with pleurodesis. For not distinguishing between inflammatory and neoplasic processes while using PET or CT, suspicion of pleural involvement can result in the indication for invasive diagnostic procedures or inadequate exchange of therapy. In such cases, the hypothesis of the inflammatory process must be included in the differential diagnoses for positive findings with the PET/CT in patients with NSCLC who have undergone pleurodesis, independently of time since the procedure. The reports of two patients with NSCLC have been presented in order to illustrate situations in which pleurodesis has been performed at the moment of diagnosis, outside of a cancer centre. PMID:25183997

Amarante, Marcus Paulo Fernandes; Younes, Riad Naim; Rigo, Letícia; de Sousa Cruz, Marcelo Rocha

2014-01-01

82

Comparison of characteristic CT findings of lymphedema, cellulitis, and generalized edema in lower leg swelling.  

PubMed

To determine the different computed tomography (CT) findings of lymphedema, cellulitis, and generalized edema in the lower leg. CT images of 44 patients with confirmed lymphedema (n = 19), cellulitis (n = 11), or generalized edema (n = 14) were retrospectively reviewed. The following characteristics were evaluated: extent of edema, laterality, skin thickening, honeycombing, taller than wide appearance, muscle edema, conglomeration of septum of fat lobule, fluid collection, fascial enhancement, inguinal lymph node (LN) enlargement, medullary fat obliteration of inguinal LN, trunk subcutaneous edema, and bone marrow edema. Fisher's exact test with Bonferroni correction was used for multiple comparisons. Honeycombing and taller than wide appearance of fat lobules were more common in lymphedema (P < 0.01). Fat obliteration of inguinal LN and inguinal LN enlargement at the affected side were more common in cellulitis (P < 0.01). Bone marrow and subcutaneous edema of the trunk were more common in generalized edema (P < 0.01). Honeycombing is commonly seen in lymphedema, but is not a specific finding. Inguinal LN enlargement is a specific sign of cellulitis. Truncal edema and bone marrow edema were specific findings of generalized edema. PMID:24293042

Shin, Sung Ui; Lee, Whal; Park, Eun-Ah; Shin, Cheong-Il; Chung, Jin Wook; Park, Jae Hyung

2013-12-01

83

Use of coronary CT angiography in the diagnosis of patients with suspected coronary artery disease: findings and clinical indications  

PubMed Central

Objective To investigate the clinical applications of coronary CT angiography in patients with suspected coronary artery disease and identify factors that affect CT findings. Methods Medical records of patients suspected of coronary artery disease over a period of 12 months from a tertiary teaching hospital were retrospectively reviewed. Patient age, sex (male/female), duration of symptoms and abnormal rates of coronary CT angiography scans were analysed to investigate the relationship among these parameters. The patients by age were characterized into five groups: under 36 years, 36–45 years, 46–55 years, 56–65 years and more than 66 years, respectively; while the duration of symptoms was also classified into five groups: less than one week, one week to one month, one to three months, three to six months and more than six months. Results Of the 880 patient records reviewed, 800 met the above study criteria. Five hundred and forty nine patients demonstrated abnormal CT findings (68.6%). There was no significant difference in the percentage of abnormal CT findings based on patient sex and the duration of symptoms (P = 0.14). The abnormal rates of coronary CT angiography, however, increased significantly with increasing age (P < 0.001); with patients over 65 years of age 2.5 times more likely to have an abnormal CT scan relative to a patient under 45 years. A significant difference was found between abnormal coronary CT angiography and the duration of symptoms (P = 0.012). Conclusions Our results indicate coronary CT angiography findings are significantly related to the patient age group and duration of symptoms. Clinical referral for coronary CT angiography of patients with suspected coronary artery disease needs to be justified with regard to the judicious use of this imaging modality. PMID:22916056

Sun, Zhong-Hua; Liu, Yu-Pin; Zhou, Dong-Jin; Qi, Yan

2012-01-01

84

A rare syndrome with unusual dental findings: Oculo-facio-cardio-dental syndrome  

PubMed Central

Radiculomegaly of a tooth is a rare condition. When it is associated with other dental abnormalities, facial dysmorphism and congenital cataracts, the condition is named as oculofaciocardiodental (OFCD) syndrome. This is an X-linked dominant trait, reported only in women, suggesting that it is lethal in males. The most consistent and pathognomic dental finding of OFCD is radiculomegaly (extremely long roots), particularly of the canines and occasionally of other teeth including premolars and incisors, which can easily be diagnosed on dental panoramic radiographs by a dentist or an orthodontist. Till date, 21 cases have been reported worldwide. The aim of this report is to present a new case of a 24 year old female affected by this syndrome and to evaluate it from a dental perspective to call the attention of dentists to this rare anomaly. PMID:25328326

Verma, Geeta; Singh, Gulshan Kumar; Tandon, Pradeep; Verma, Sneh Late

2014-01-01

85

Zeta waves, an unusual EEG finding in structural brain lesions: report of two patients.  

PubMed

We report two patients with acute cerebral conditions and zeta waves on their EEGs. The first patient, a 48-year-old lady, had acute disseminated encephalomyelitis (ADEM)following afebrile illness. Neurological examination showed expressive dysphasia and a mild right hemiparesis. The magnetic resonance imaging (MRI) scan of the brain showed multiple, bilateral, subcortical white matter hyperintensities, predominantly in the centrum semiovale region of the left hemisphere, and also in the corpus callosum. An EEG done 21 days after the onset of the neurological deficit showed intermittent, sharply contoured, predominantly biphasic delta waves (zeta waves) over the left frontotemporal region. The second patient was a 2-year-old child, who had a head-injury resulting in bilateral, frontoparietal fractures of the skull; acute epidural hematoma on the left frontoparietal region; and a cerebral contusion on the right frontotemporal region. An EEG done one day after the evacuation of the hematoma showed zeta waves over the right frontal region. To the best of our knowledge, the association of zeta waves and ADEM has not been previously reported. The EEG findings in our patients again supports the hypothesis that these waves are seen predominantly in patients with structural brain lesions. Other conditions causing zeta waves in the EEG are briefly reviewed. PMID:15310029

Siepman, T A M; Cherian, P Joseph; Visser, G H

2004-03-01

86

CT findings in malignant pleural mesothelioma related to nonoccupational exposure to asbestos and fibrous zeolite (erionite).  

PubMed

Endemic malignant pleural mesothelioma (MPM) in Turkey is related to two mineral fibers, tremolite asbestos and fibrous zeolite (erionite). Thirteen cases of MPM from the Cappadocian area, where the soil is rich in erionite, and 29 cases of MPM, from villages whose occupants have high asbestos exposure, were examined by CT. The CT findings of the two groups of MPM were compared with respect to the configuration of the pleural lesions, stage of disease, fissural involvement, pleural effusion, presence of calcified pleural plaques, and chronic fibrosing pleuritis. In erionite-related MPM the pleural lesions were flat and smooth in 69.1%; in asbestos-related MPM the lesions were nodular in 55.1%. Stage IV disease, calcified pleural plaques, and chronic fibrosing pleuritis were more common in the erionite-related MPM. The rest of the findings were similar in both groups. The early radiological diagnosis of erionite-related MPM may be even more difficult because of the similarity of the pleural lesions to chronic fibrosing pleuritis. PMID:1848247

Erzen, C; Eryilmaz, M; Kalyoncu, F; Bilir, N; Sahin, A; Baris, Y I

1991-01-01

87

Electrocardiography in conscious releasable Andean condors (Vultur gryphus): reference panel and unusual findings.  

PubMed

Electrocardiography is a useful tool when included in healthcare protocols and is increasingly utilized for monitoring wild birds. However, the lack of reference data for many species is limiting the clinical value of this technique. In this study 26 Andean condors (Vultur gryphus) coming from rehabilitation and captive breeding programs were examined to determine electrocardiographic references prior to being released. Standard bipolar (I, II, and III) and augmented unipolar limb (aVR, aVL, and aVF) leads were recorded with birds under physical restraint. Five beats were analyzed on Lead II at 50?mm/sec and 1?cm?=?1?mV to determine QRS complex morphology, cardiac rhythm, heart rate, P, PR, R, S, QRS, T, QT, and ST amplitude and/or duration. P and T wave configuration was determined for all leads, and Mean Electrical Axis (MEA) in the frontal plane was determined using leads I and III. Cardiac rhythm corresponded to regular sinus rhythm in 42% of the birds, with a relevant rate of sinus arrhythmia in 58%, and rS as the most common pattern (42%) for QRS complex in lead II. We found an influence of age and heart rate but not of sex on several ECG waves and intervals. Relevant ECG findings for studied Andean condors include a high rate of T(a), R', and U wave detection. Waves T(a) and R' were considered non-pathological, while the significance of U waves remains unclear. Our results provide a useful reference to improve clinical interpretation of full electrocardiographic examination in Andean condors. PMID:23386535

Wiemeyer, Guillermo M; Lambertucci, Sergio A; Bianchini, Laura Torres; Belerenian, Guillermo

2013-01-01

88

Granulocytic Sarcoma in the Head and Neck: CT and MR Imaging Findings  

PubMed Central

Objectives To evaluate characteristic computed tomography (CT) and magnetic resonance (MR) imaging findings of granulocytic sarcomas of the head and neck. Methods The CT (n=11) and MR (n=1) images obtained from 11 patients (7 males and 4 females; mean age, 23.5 yr; age range, 1 to 69 yr) with histologically-proven granulocytic sarcomas of the head and neck were retrospectively reviewed. Histological confirmation was done by bone marrow biopsy in 9 patients, and/or local biopsy in 4 patients. The imaging findings were analyzed with particular attention to location, size, shape, margin, bone destruction, internal architecture, pattern and degree of enhancement, and multiplicity of the lesions. Results The masses were most commonly located in the orbital cavity (n=8); other locations included lymph nodes (n=5) and palatine/pharyngeal/lingual tonsils (n=3). The mass sizes varied from a mean diameter of 1.3 to 5.8 cm (average, 2.6 cm). Multiple lesions were found in 6 patients. The shapes of the tumors were ovoid in 12 patients and irregular in 4 patients. Most lesions had poorly-defined margins (13/16) and invaded adjacent bony structures (5/16). On the pre-contrast CT images, the masses were iso- (5/8) or low-density (3/8) in comparison with muscle. The MRI, which was obtained in one patient in this study, showed that the mass was iso-signal intensity on T1-weighted images and iso-signal intensity on T2-weighted images compared to the gray matter of the brain. On the post-contrast CT images, there was homogenesous (n=12) or heterogeneous (n=4) enhancement, with mild (n=10), moderate (n=4), and marked (n=2) enhancement in the solid portions of the lesions. Conclusion Although rare, granulocytic sarcomas arise in various locations in the head and neck area (most commonly in the orbit) in the form of well-demarcated, and mildly- and homogenously-enhancing masses with adjacent bony invasion. PMID:19565030

Noh, Bong Wan; Chun, Jung-Eun; Kim, Ji Hye; Kim, Hyung Jin; Lim, Myung Kwan

2009-01-01

89

Three-Dimensional CT Findings of Os Calcaneus Secundarius Mimicking a Fracture  

PubMed Central

Os calcaneus secundarius is one of several accessory ossicles of the foot that have been identified as normal variants of skeletal development. It may cause ankle pain and may mimic an avulsion fracture of the anterior calcaneal process. A twenty-year-old male was admitted to our institution with right ankle pain following an inversion injury. An axial CT image of the patient's right ankle revealed a shape with smooth and sharp margins, identified as a well-corticated bone fragment in the subtalar region. A diagnosis of an accessory ossicle, os calcaneus secundarius, was made based on radiographic findings. As a result of this case, it is recommended that potential locations of the accessory bones should be well understood in order to prevent misdiagnosis and inappropriate surgical procedures. Os calcaneus secundarius must be considered when an apparent bone fragment or a suspicious fracture line at the anterior region of os calcaneus is demonstrated. PMID:25610694

Bulut, Mehmet Deniz; Bora, Ayd?n; Gökalp, Mehmet Ata; Özkaçmaz, Sercan; Batur, Abdussamet

2014-01-01

90

Laparoscopic Extraperitoneal Para-aortic Lymphadenectomy in Locally Advanced Cervical Cancer: A Prospective Correlation of Surgical Findings with PET/CT Findings  

PubMed Central

Background Failure to detect metastasis to para-aortic nodes in patients with locally advanced cervical cancer leads to suboptimal treatment. No previous studies have prospectively compared PET/CT with laparoscopic extraperitoneal staging in the evaluation of para-aortic lymph nodes. Methods Sixty-five patients were enrolled; 60 were available for analysis. Patients with stage IB2-IVA cervical cancer without evidence of para-aortic lymphadenopathy on preoperative CT or MRI were prospectively enrolled. All patients underwent preoperative PET/CT. Laparoscopic extraperitoneal lymphadenectomy was performed from the common iliac vessels to the left renal vein. Results The median age at diagnosis was 48 years (range, 23-84). The median operative time was 140 minutes (range, 89-252). The median blood loss was 22.5 ml (range, 5-150). The median length of hospital stay was 1 day (range, 0-4). The median number of lymph nodes retrieved was 11 (range, 1-39). Fourteen patients (23%) had histopathologically positive para-aortic nodes. Of the 26 patients with negative pelvic and para-aortic nodes on PET/CT, 3 (12%) had histopathologically positive para-aortic nodes. Of the 27 patients with positive pelvic but negative para-aortic nodes on PET/CT, 6 (22%) had 4 histopathologically positive para-aortic nodes. The sensitivity and specificity of PET/CT in detecting positive para-aortic nodes when nodes were negative on CT or MRI were 36% and 96%, respectively. Eleven patients (18.3%) had a treatment modification based on surgical findings. Conclusion Laparoscopic extraperitoneal para-aortic lymphadenectomy is safe and feasible. Surgical staging of patients with locally advanced cervical cancer should be considered prior to planned radiation and chemotherapy. PMID:21509770

Ramirez, Pedro T.; Jhingran, Anuja; Macapinlac, Homer A.; Euscher, Elizabeth D.; Munsell, Mark F.; Coleman, Robert L.; Soliman, Pamela T.; Schmeler, Kathleen M.; Frumovitz, Michael; Ramondetta, Lois M.

2014-01-01

91

Impact of FDG-PET/CT on Radiotherapy Volume Delineation in Non-Small-Cell Lung Cancer and Correlation of Imaging Stage With Pathologic Findings  

SciTech Connect

Purpose: Fluorodeoxyglucose-positron emission tomography (FDG-PET)/computed tomography (CT) is more accurate than CT in determining the extent of non-small-cell lung cancer. We performed a study to evaluate the impact of FDG-PET/CT on the radiotherapy volume delineation compared with CT without using any mathematical algorithm and to correlate the findings with the pathologic examination findings. Methods and Materials: A total of 32 patients with proven non-small-cell lung cancer, pathologic specimens from the mediastinum and lung primary, and pretreatment chest CT and FDG-PET/CT scans were studied. For each patient, two data sets of theoretical gross tumor volumes were contoured. One set was determined using the chest CT only, and the second, done separately, was based on the co-registered FDG-PET/CT data. The disease stage of each patient was determined using the TNM staging system for three data sets: the CT scan only, FDG-PET/CT scan, and pathologic findings. Results: Pathologic examination altered the CT-determined stage in 22 (69%) of 32 patients and the PET-determined stage in 16 (50%) of 32 patients. The most significant alterations were related to the N stage. PET altered the TNM stage in 15 (44%) of 32 patients compared with CT alone, but only 7 of these 15 alterations were confirmed by the pathologic findings. With respect to contouring the tumor volume for radiotherapy, PET altered the contour in 18 (56%) of 32 cases compared with CT alone. Conclusion: The contour of the tumor volume of non-small-cell lung cancer patients with co-registered FDG-PET/CT resulted in >50% alterations compared with CT targeting, findings similar to those of other publications. However, the significance of this change is unknown. Furthermore, pathologic examination showed that PET is not always accurate and histologic examination should be obtained to confirm the findings of PET whenever possible.

Faria, Sergio L. [Department of Radiation Oncology, McGill University Health Centre, Montreal, QC (Canada)], E-mail: sergio.faria@muhc.mcgill.ca; Menard, Sonia [Department of Radiation Oncology, McGill University Health Centre, Montreal, QC (Canada); Devic, Slobodan [Department of Medical Physics, McGill University Health Centre, Montreal, QC (Canada); Sirois, Christian [Department of Surgery, McGill University Health Centre, Montreal, QC (Canada); Souhami, Luis [Department of Radiation Oncology, McGill University Health Centre, Montreal, QC (Canada); Lisbona, Robert [Department of Nuclear Medicine, McGill University Health Centre, Montreal, QC (Canada); Freeman, Carolyn R. [Department of Radiation Oncology, McGill University Health Centre, Montreal, QC (Canada)

2008-03-15

92

Burkitt's Lymphoma Presented as Advanced Ovarian Cancer without Evidence of Lymphadenopathy: CT and MRI Findings  

PubMed Central

Burkitt's lymphoma is a rare non-Hodgkin's lymphoma which can occasionally involve the ovary and may cause confusion for the clinician since its presentation might mimic other much more frequent tumors. We present a case of a 23-year-old woman with sporadic Burkitt's lymphoma presented as advanced ovarian cancer with bilateral ovarian masses, peritoneal carcinomatosis, ascites, and marked elevation of CA-125. Liver involvement and atypical bone lesions, such as the cranial vault and the iliac wing, were also detected without evidence of lymphadenopathy. We describe the MRI and CT findings of simultaneous ovarian and bone lesions, which have never been reported in literature in a patient with Burkitt's lymphoma, before and after one cycle of chemotherapy. In evaluating any ovarian neoplasm in a young woman, Burkitt's lymphoma should be considered as a possibility, particularly if associated with bone lesions. MRI is the most useful tool to characterize the ovarian lesions and suggest the diagnosis before the histopathological results. PMID:23607034

Manganaro, Lucia; Bernardo, Silvia; Sergi, Maria Eleonora; Sollazzo, Paolo; Vinci, Valeria; De Grazia, Alessandra; Clerico, Anna; Mollace, Maria Giovanna; Saldari, Matteo

2013-01-01

93

Primary Endobronchial Marginal Zone B-Cell Lymphoma of Bronchus-Associated Lymphoid Tissue: CT Findings in 7 Patients  

PubMed Central

Objective To investigate CT and 18F-flurodeoxyglucose (18F-FDG) positron-emission tomography/CT findings of primary endobronchial marginal zone B-cell lymphoma of the bronchus-associated lymphoid tissue (BALT). Materials and Methods From June 2006 through April 2012, seven patients (six female, one male; age range, 21-61 years; mean age, 49 years) were examined who were pathologically diagnosed with the primary endobronchial marginal zone B-cell lymphoma of BALT. We evaluated the locations and characteristics of the lesions on CT and 18F-FDG-PET/CT scans. The lesions were classified into the following three patterns: 1) solitary intraluminal nodule; 2) several tiny nodular protrusions; and 3) diffuse wall thickening. Results A solitary intraluminal nodule was observed in four patients (57.1%), several tiny nodular protrusion in two patients (28.6%), and diffuse wall thickening in one patient (14.3%). The lesions were categorized into 3 major locations: confined to the trachea (n = 3), confined to the lobar bronchus (n = 2), and diffuse involvement of the trachea and both main bronchi (n = 2). All lesions demonstrated homogeneous iso-attenuation as compared with muscle on pre- and post-enhancement scans. Secondary findings in the lungs (n = 3; 42.9%) included postobstructive lobar atelectasis (n = 1), air trapping (n = 1), and pneumonia (n = 1). On 18F-FDG-PET/CT (n = 5), 4 lesions showed homogeneous uptake with maximum standardized uptake values (mSUV), ranging 2.3-5.7 (mean mSUV: 3.3). One lesion showed little FDG uptake. Conclusion Primary endobronchial marginal zone B-cell lymphoma of the BALT manifests as three distinct patterns on CT, with the solitary intraluminal nodule presenting as the main pattern. Most lesions demonstrate homogeneous but weak FDG uptake on 18F-FDG-PET/CT. PMID:23483549

Yoon, Ra Gyoung; Song, Jae Woo; Chae, Eun Jin; Choi, Chang Min; Jang, SeJin

2013-01-01

94

18F-FDG PET/CT Findings of a Recurrent Adenocarcinoma Arising From Malignant Transformation of Abdominal Wall Endometriosis.  

PubMed

Abdominal wall endometriosis (AWE) is defined as endometrial tissue located superficial to the peritoneum, which usually develops in a surgical scar of cesarean delivery. Malignant transformation of AWE is a very rare disease. The most frequent histotype of malignancy developing from AWE is endometrioid adenocarcinoma. We present F-FDG PET/CT findings in a 37-year-old woman with a recurrent adenocarcinoma arising from malignant transformation of AWE, who underwent a repeat PET/CT scan because of a recurrent mass at the upper right side of the surgical incision after a previous cesarean delivery. PMID:25546222

Jiang, Maoqing; Chen, Ping; Sun, Long; Huang, Qiuli; Wu, Hua

2015-02-01

95

CT findings in two cases of lobular capillary haemangioma of the nasal cavity: focusing on the enhancement pattern.  

PubMed

Lobular capillary haemangioma, known as pyogenic granuloma, is a relatively common benign vascular neoplasm that is composed of hyperplastic clusters of capillaries arranged in a lobular architectural pattern. Most mucosal lobular capillary haemangioma (LCH) of the head and neck arise in the oral cavity, but the nasal cavity involvement is rare. We report here on the CT imaging findings of two cases of LCH involving the nasal cavity, with an emphasis being placed on the different pattern of enhancement of the tumour on the enhanced CT scans. PMID:22074874

Lee, Gk; Suh, Kj; Lee, Yh; Kang, Iw

2012-02-01

96

Incidental finding of anterior cranial fossa meningioma on 18F-fluoride PET/CT.  

PubMed

The association of breast carcinoma and meningioma has been described. We report a case of anterior cranial fossa meningioma in a woman with breast cancer detected by (18)F-fluoride PET/CT. The whole-body (18)F-fluoride PET images demonstrate an intense intracranial focal radiotracer accumulation in the skull base. Simultaneous CT showed a corresponding calcified space-occupying lesion consistent with meningioma. Follow-up CT image obtained 8 months later demonstrated the persistence and stable appearance of the lesion. PMID:24096998

Zacchi, Samara Riguete; Duarte, Paulo Schiavon; Coura Filho, George Barberio; Sapienza, Marcelo Tatit; Buchpiguel, Carlos Alberto

2013-11-01

97

UNUSUAL FINDINGS IN ZEBRAFISH, DANIO RERIO, FROM TOXICOLOGICAL STUDIES AND THE ZEBRAFISH INTERNATIONAL RESOURCE CENTER DIAGNOSTIC SERVICE  

EPA Science Inventory

A number of interesting and unusual lesions have been diagnosed in zebrafish that have been evaluated from toxicological studies or submitted as cases to the Diagnostic Service at Oregon State University. Lesions were observed in various wild-type and mutant lines of zebrafish an...

98

Acute epiploic appendagitis in hernia sac: CT appearance  

Microsoft Academic Search

We describe an unusual cause of acute abdomen due to acute epiploic appendagitis located within an incisional hernia sac. The contrast-enhanced CT showed an oval fat density structure with surrounding inflammation in the transverse mesocolon. The contrast-enhanced CT findings of the inflammation of appendices epiploicae of the transverse colon were diagnostic in this case.

Ajay K. Singh; Debra Gervais; James Rhea; Peter Mueller; Robert A. Noveline

2005-01-01

99

NIH study finds childhood CT scans linked to leukemia and brain cancer later in life  

Cancer.gov

Children and young adults scanned multiple times by computed tomography (CT), a commonly used diagnostic tool, have a small increased risk of leukemia and brain tumors in the decade following their first scan.

100

Coronary artery anomalies and clinically important anatomy in patients with congenital heart disease: multislice CT findings  

Microsoft Academic Search

In patients with congenital heart disease, coronary artery anomalies are common and have different clinical importance from\\u000a individuals with structurally normal hearts. Visibility of the coronary arteries by CT has markedly improved due to high temporal\\u000a resolution and ECG-synchronized data acquisition. In this article we describe current multislice CT techniques for coronary\\u000a artery imaging and illustrate coronary artery anomalies and

Hyun Woo Goo; Dong-Man Seo; Tae-Jin Yun; Jeong-Jun Park; In-Sook Park; Jae Kon Ko; Young Hwee Kim

2009-01-01

101

Transcatheter aortic valve replacement: postoperative CT findings of Sapien and CoreValve transcatheter heart valves.  

PubMed

Transcatheter aortic valve replacement represents one of the most exciting medical technical developments in recent years, offering a much-needed therapeutic alternative for patients with severe aortic valve stenosis who, due to comorbidities and advanced age, are considered to be inoperable or at high surgical risk. The efficacy of this procedure compared with standard surgical intervention has been properly validated in multicenter randomized controlled trials (PARTNER A and B trials), leading to widespread clinical implementation, with over 50,000 procedures currently being performed worldwide each year. Although much of the attention has rightly focused on the potential role of computed tomography (CT) in the preprocedural assessment of the aortic root and the establishment of imaging-guided valve-sizing algorithms, less is known regarding the postprocedural CT characteristics of transcatheter heart valves (THVs). However, given the increasing worldwide recognition and clinical implementation of these devices, they will no doubt be encountered with increasing frequency in patients referred for thoracic CT, either for postprocedural evaluation of the aortic root or for unrelated reasons. Familiarity with these devices and their CT characteristics will increase diagnostic confidence and the value of the radiology report. The authors describe the physical and imaging properties of the currently commercially available THVs, their normal postprocedural imaging appearances, and potential complications that can be detected at CT. In addition, they discuss the relative strengths and weaknesses of CT and echocardiography in this setting. PMID:25310415

Salgado, Rodrigo A; Budde, Ricardo P J; Leiner, Tim; Shivalkar, Bharati; Van Herck, Paul L; Op de Beeck, Bart J; Vrints, Christiaan; Buijsrogge, Marc P; Stella, Pieter R; Rodrigus, Inez; Bosmans, Johan; Parizel, Paul M

2014-10-01

102

A Case of Sarcoidosis with Unusual Radiographic Findings that Developed 5 Years after Silicone Augmentation Mammoplasty Complicated by Miliary Tuberculosis during Corticosteroid Treatment  

PubMed Central

A 54-year-old woman with a past history of silicone augmentation mammoplasty was admitted with fever and dyspnea with diffuse interstitial shadows on computed tomography (CT). Although radiological findings were atypical, we diagnosed sarcoidosis by laboratory, microbiological, and bronchoalveolar lavage fluid analysis. Corticosteroids ameliorated the condition, but she had recurrent of fever and CT revealed miliary nodules while interstitial shadows disappeared. Liver biopsy showed that noncaseating granuloma and Ziehl-Neelsen stain was positive. We diagnosed miliary tuberculosis which developed during corticosteroid therapy. Antituberculotic therapy resulted in favorable outcome. Possibility exists that onset of sarcoidosis was induced by mammoplasty, namely, human adjuvant disease. PMID:22937422

Miyashita, Tomoko; Yoshioka, Katsunobu; Nakamura, Tomoyuki; Yamagami, Keiko

2011-01-01

103

[Malignant chest wall infiltration in MR: comparison with CT and surgical findings].  

PubMed

CT and MRI were performed on 19 patients with pleura related thoracic tumors with respect to the detection of chest-wall invasion. All patients underwent surgery, which confirmed malignant infiltration in 16 cases, while this was excluded in three. CT showed chest-wall invasion in 12/19 patients. MRI demonstrated tumorous involvement in 16 patients. A reliable pattern of chest-wall invasion in MRI were high signal intensity lesions within the chest-wall in the T2-weighted images. However, increased signal intensity of pleural structures was found in inflammatory as well as in malignant lesions. MRI can prove the presence of chest-wall invasion when CT is equivocal. PMID:2554415

Bittner, R; Schörner, W; Sander, B; Weiss, T; Loddenkemper, R; Kaiser, D; Felix, R

1989-11-01

104

Intraorbital Encephalocele Presenting with Exophthalmos and Orbital Dystopia : CT and MRI Findings  

PubMed Central

A 15-year-old female patient with progressive pulsatile exophthalmos caused by intraorbital encephalocele was evaluated with computed tomography (CT) and magnetic resonance imaging (MRI) in our clinic. She had no history of trauma or reconstructive surgery. When she was a little girl, she had undergone surgery for congenital glaucoma on the right eye. On the three-dimensional image of CT, a hypoplasic bone defect was observed in the greater wing of the right sphenoid bone. MRI and CT scan showed herniation through this defect of the arachnoid membrane and protruded cerebral tissue into the right orbita. Intraorbital encephalocele is an important entity that can cause pulsatile exophthalmos and blindness. PMID:25674346

Gunduz, Yasemin; Yaldiz, Can; Aksoy, Yakup Ersel

2015-01-01

105

CT and MRI Findings of Hepatic Involvement in Rendu-Osler-Weber Disease  

PubMed Central

Rendu-Osler-Weber disease is a rare autosomal dominant disorder. Hepatic involvement manifests itself as vascular, parenchymal, and biliary lesions with characteristic telangiectasias and vascular shunts. In a 37-year-old female patient, dynamic contrast-enhanced upper abdominal CT and MRI were performed. CT and MRI revealed dilated celiac trunk and hepatic artery. On early arterial phase, dilated hepatic veins showed significant enhancement. On arterial and portal venous phases, liver showed significantly heterogeneous contrast enhancement and showed homogenous enhancement in the hepatic parenchymal phase. On the magnetic resonance cholangiopancreatography, irregular biliary ducts with strictures and dilatation were seen. PMID:23198241

Bilgin, Mehmet; Yildiz, Seyma; Toprak, Huseyin; Ahmad, Issam Cheikh; Kocakoc, Ercan

2012-01-01

106

Intraosseous pneumatocysts of the ilium: findings on radiographs and CT scans  

SciTech Connect

CT scans demonstrated a localized collection of gas adjacent to a normal sacroiliac joint in 5 patients. In each case the lesion was sharply demarcated by a thin sclerotic rim. A benign bone cyst was confirmed histologically in 2 cases. The radiologist should be aware of this appearance so as to avoid invasive procedures based on a misdiagnosis of infection or neoplasm.

Ramirez, H.; Blatt, E.S.; Cable, H.F.; McComb, B.L.; Zornoza, J.; Hibri, N.S.

1984-02-01

107

Using the World Health Organization Classification of Thymic Epithelial Neoplasms to Describe CT Findings  

Microsoft Academic Search

OBJECTIVE . Our purpose was to assess the CT features of various subtypes of thymic ep- ithelial neoplasms on the basis of the 1999 World Health Organization classification. MATERIALS AND METHODS . Thymic epithelial neoplasms in 53 patients who under- went thymectomy were retrospectively assessed histologically according to the 1999 World Health Organization classification. Type A and B neoplasms correspond

Noriyuki Tomiyama; Takeshi Johkoh; Naoki Mihara; Osamu Honda; Takenori Kozuka; Mitsuhiro Koyama; Seiki Hamad; Meinoshin Okumura; Mitsunori Ohta; Tadaaki Eimoto; Masao Miyagawa; Nestor L. Müller; Junpei Ikezoe; Hironobu Nakamura

108

Study Finds Small Increase in Cancer Risk after Childhood CT Scans  

Cancer.gov

A study published in the June 6, 2012, issue of The Lancet shows that radiation exposure from computed tomography (CT) scans in childhood results in very small but increased risks of leukemia and brain tumors in the first decade after exposure.

109

Northwestern researchers find lower dosage CT-guided lung biopsy protocol maintains quality, minimizes exposure  

Cancer.gov

New guidelines for CT-guided biopsies of lung nodules significantly reduce radiation exposure allowing individuals the benefit of the procedure, which may cut down on overall lung cancer deaths. This research is being presented at the Society of Interventional Radiology's 37th Annual Scientific Meeting in San Francisco, Calif.

110

Nutcracker Syndrome Accompanying Pelvic Congestion Syndrome; Color Doppler Sonography and Multislice CT Findings: A Case Report.  

PubMed

Nutcracker syndrome (NCS) is a rare pathology, caused by compression of the left renal vein (LRV) between the abdominal aorta (AA) and the superior mesenteric artery (SMA), due to reduction of the angle between AA and SMA. This leads to LRV varices, left gonadal vein varices and therefore, the pelvic congestion syndrome. For this reason, coexistence of NCS and pelvic congestion syndrome has been described. It manifests by hematuria, proteinuria, and nonspecific pelvic pain secondary to pelvic congestion, dyspareunia and persistent genital arousal. We report a 27-year-old woman who experienced hematuria and left flank pain. The diagnosis of NCS accompanied by pelvic congestion syndrome was missed initially, but later on the diagnosis was made by color Doppler ultrasound, abdominal computed tomography (CT) and CT angiography that were later performed. She refused interventional and surgical treatments, and was lost to follow up. PMID:25035694

Inal, Mikail; Karadeniz Bilgili, Mihrace Yasemin; Sahin, Safa

2014-05-01

111

Foramen of Monro meningioma with atypical appearance: CT and conventional MR findings.  

PubMed

Intraventricular meningiomas have often been reported; however, literature reveals very few cases localized within foramen of Monro. Herein we report a 57-year-old woman admitted with obstructive hydrocephalus-related symptoms. Strikingly, the lesion was completely calcified in CT and had no marked solid component on MRI. The lesion was completely removed by surgical resection with a transfrontal intraventricular approach. The resected mass was histopathologically diagnosed as meningioma. The patient's symptoms resolved immediately after the operation. PMID:17875150

Hakyemez, B; Erdogan, C; Oruc, E; Aker, S; Aksoy, K; Parlak, M

2007-10-01

112

CT and MR in non-neonatal hypoxic–ischemic encephalopathy: radiological findings with pathophysiological correlations  

Microsoft Academic Search

Non-neonatal hypoxic–ischemic encephalopathy is a clinical condition often related to cardiopulmonary arrest that demands\\u000a critical management and treatment decisions. Management depends mainly on the degree of neurological impairment and prognostic\\u000a considerations. Computed tomography (CT) is often used to exclude associated or mimicking pathology. If any, only nonspecific\\u000a signs such as cerebral edema, sulci effacement, and decreased gray matter (GM)\\/white matter

Leonardo Guilhermino Gutierrez; Àlex Rovira; Luiz Antonio Pezzi Portela; Claudia da Costa Leite; Leandro Tavares Lucato

2010-01-01

113

Focused radiation hepatitis after Bragg-peak proton therapy for hepatocellular carcinoma: CT findings  

SciTech Connect

Radiation hepatitis is clearly demonstrated by noncontrast and contrast enhanced CT following radiotherapy for liver diseases. Radiation hepatitis is dependent on dose distribution and is usually demonstrated as nonsegmental bandlike lesion after photon therapy. We report a case of focused, oval-shaped radiation hepatitis that was induced by photon therapy. The attenuation difference was localized in a high-dose area caused by Bragg-peak proton therapy. 17 refs., 2 figs.

Okumura, Toshiyuki; Itai, Yuji; Tsuji, Hiroshi [Central Hospital of Ibaraki (Japan)] [and others

1994-09-01

114

The double flipped meniscus sign: unusual MRI findings in bucket-handle tear of the lateral meniscus.  

PubMed

Bucket-handle meniscal tears are either longitudinal, vertical, or oblique in direction with an attached tear fragment displaced from the meniscus. Magnetic resonance imaging (MRI) signs are widely used in the diagnosis of these tears, including the 'fragment within the intercondylar notch sign', 'flipped meniscus sign', 'double anterior horn sign', 'absence of the bow tie sign', 'double posterior cruciate ligament (PCL) sign', 'posterior double PCL sign', and 'triple PCL sign'. We report an unusual case, not yet described in previous studies, of a bucket-handle tear presenting as a double longitudinal tear of the lateral meniscus (LM). Two longitudinal tears were observed in the white-white zone and the red-white zone of the LM, where both fragments were shown to be displaced and locked within the intercondylar notch. Partial menisectomy was performed for the central fragment and a repair with modified all-inside sutures was performed for the peripheral fragment. PMID:24156924

Ahn, Jin Hwan; Yim, Soo Jae; Seo, Yu Seok; Ko, Taeg Su; Lee, Joon Hee

2014-01-01

115

Extraskeletal intraspinal mesenchymal chondrosarcoma; 18F-FDG PET/CT finding.  

PubMed

Mesenchymal chondrosarcoma is a rare and aggressive form of chondrosarcoma. The extraskeletal intraspinal type is even rare among the mesenchymal chondrosarcoma cases. We presented a case of a 17-year-old boy pathologically diagnosed with intraspinal mesenchymal chondrosarcoma. MRI showed multiple intradural extramedullary masses with contrast enhancement, without the evidence of brain lesion. On F-FDG PET/CT, hypermetabolism was observed in the lesions matched with enhancement on spine MRI. The lesions were well differentiated from spinal cord. In the case of hypermetabolic lesion in intradural and extramedullary lesion of the spinal cord, mesenchymal chondrosarcoma should be considered for the differential diagnosis. PMID:23877507

Lee, EunSeong; Lee, Ho Young; Choe, Gheeyoung; Kim, Ki-Jeong; Lee, Won Woo; Kim, Sang Eun

2014-01-01

116

A case of intussusception of the appendix secondary to endometriosis: US and CT findings.  

PubMed

Intussusception of the appendix is an uncommon condition that is difficult to diagnose with radiology. Endometriosis causing appendiceal intussusception is a rare condition that has only been reported a few times in the literature. Here, we report a case of appendiceal intussusception caused by endometriosis in a 33-year-old woman who presented with intermittent right lower abdominal pain. Sonography revealed a hypoechoic mass invaginating into the cecum, which was covered by echogenic cecal wall with central dimpling indicating the appendiceal orifice. On CT, the mass was identified as an enhancing mass invaginating into the cecum at the level the appendiceal orifice. © 2014 Wiley Periodicals, Inc. J Clin Ultrasound, 2014. PMID:24956121

Lee, Dong Jun; Kim, Hyun Cheol; Yang, Dal Mo; Kim, Sang Won; Ryu, Jung Kyu; Won, Kyu Yeoun; Lee, Suk Hwan

2014-06-23

117

Common and unexpected findings in mummies from ancient Egypt and South America as revealed by CT.  

PubMed

Computed tomography (CT) has proved to be a valuable investigative tool for mummy research and is the method of choice for examining mummies. It allows for noninvasive insight, especially with virtual endoscopy, which reveals detailed information about the mummy's sex, age, constitution, injuries, health, and mummification techniques used. CT also supplies three-dimensional information about the scanned object. Mummification processes can be summarized as "artificial," when the procedure was performed on a body with the aim of preservation, or as "natural," when the body's natural environment resulted in preservation. The purpose of artificial mummification was to preserve that person's morphologic features by delaying or arresting the decay of the body. The ancient Egyptians are most famous for this. Their use of evisceration followed by desiccation with natron (a compound of sodium salts) to halt putrefaction and prevent rehydration was so effective that their embalmed bodies have survived for nearly 4500 years. First, the body was cleaned with a natron solution; then internal organs were removed through the cribriform plate and abdomen. The most important, and probably the most lengthy, phase was desiccation. After the body was dehydrated, the body cavities were rinsed and packed to restore the body's former shape. Finally, the body was wrapped. Animals were also mummified to provide food for the deceased, to accompany the deceased as pets, because they were seen as corporal manifestations of deities, and as votive offerings. Artificial mummification was performed on every continent, especially in South and Central America. PMID:18794321

Jackowski, Christian; Bolliger, Stephan; Thali, Michael J

2008-01-01

118

CT-Guided Transthoracic Core Biopsy for Pulmonary Tuberculosis: Diagnostic Value of the Histopathological Findings in the Specimen  

SciTech Connect

We evaluated the value of CT-guided transthoracic core biopsy for the diagnosis of mycobacterial pulmonary nodules. The 30 subjects in this study had pulmonary nodules that had been either diagnosed histopathologically as tuberculosis or were suspected as tuberculosis based on a specimen obtained by CT-guided transthoracic core biopsy. The histopathological findings, the existence of acid-fast bacilli in the biopsy specimens, and the clinical course of the patients after the biopsy were reviewed retrospectively. Two of the three histological findings for tuberculosis that included epithelioid cells, multinucleated giant cells and caseous necrosis were observed in 21 of the nodules which were therefore diagnosed as histological tuberculosis. Six of these 21 nodules were positive for acid-fast bacilli, confirming the diagnosis of tuberculosis. Thirteen of the 21 nodules did not contain acid-fast bacilli but decreased in size in response to antituberculous treatment and were therefore diagnosed as clinical tuberculosis. Seven nodules with only caseous necrosis were diagnosed as suspected tuberculosis, with a final diagnosis of tuberculosis being made in 4 of the nodules and a diagnosis of old tuberculosis in 2 nodules. Two nodules with only multinucleated giant cells were diagnosed as suspected tuberculosis with 1 of these nodules being diagnosed finally as tuberculosis and the other nodule as a nonspecific granuloma. When any two of the three following histopathological findings - epithelioid cells, multinucleated giant cells or caseous necrosis - are observed in a specimen obtained by CT-guided transthoracic core biopsy, the diagnosis of tuberculosis can be established without the detection of acid-fast bacilli or Mycobacterium tuberculosis.

Fukuda, Hozumi, E-mail: fkdhzmrad@mitsuihosp.or.jp; Ibukuro, Kenji; Tsukiyama, Toshitaka; Ishii, Rei [Mitsui Memorial Hospital, Department of Radiology (Japan)

2004-09-15

119

MRI and FDG PET/CT findings in a case of probable Heidenhain variant Creutzfeldt-Jakob disease.  

PubMed

Creutzfeldt-Jakob disease (CJD) is a neurodegenerative disease caused by the accumulation of a pathogenic isoform of a prion protein in neurons that is responsible for subacute dementia. The Heidenhain variant is an atypical form of CJD in which visual signs are predominant. This is a report of the case of a 65-year-old man with probable CJD of the Heidenhain variant, with topographical concordance between findings on magnetic resonance imaging (MRI) and 18F-fluorodeoxyglucose (FDG) photopenic areas on positron emission tomography (PET)/computed tomography (CT) for cortical parietooccipital lesions. PMID:18466976

Clarençon, F; Gutman, F; Giannesini, C; Pénicaud, A; Galanaud, D; Kerrou, K; Marro, B; Talbot, J-N

2008-10-01

120

Unusual parapharyngeal lipoma.  

PubMed

Lipomas of the parapharyngeal space (PPS) are extremely rare. CT scan and MRI are indispensable tools to investigate these hard to access tumors. PPS lipomas are confined to either the prestyloid or post styloid compartments. We report an unusual parapharyngeal lipoma involving both the compartments of the PPS. PMID:25621276

Pal, Pooja; Singh, Bikramjit; Sood, Arvinder Singh

2015-03-01

121

Incidental findings detection using low tube potential for CT pulmonary angiography.  

PubMed

While lowering the radiation dose using a reduced tube potential (kVp) strategy for CT pulmonary angiography (CTPA) maintains accuracy for pulmonary embolism detection, there is no data regarding the effect of increased noise from lower kVp on both the accuracy of lung and mediastinum lesion detection in the same patient cohort. This study compares the accuracy and diagnostic confidence of lung nodules and enlarged mediastinal lymph nodes detection between low and standard kVp CTPA. The study cohort included 272 CTPA studies acquired at low kVp and 274 studies at standard kVp. Each patient had a routine chest CT acquired within 60 days of the CTPA that served as a reference standard for lung and mediastinum lesions. In additional to the evaluation of image quality, two radiologists independently interpreted lung nodules and mediastinal lymph nodes on CTPA and recorded confidence level for each interpretation. Multivariate models assessed effect of kVp settings on diagnostic accuracy and confidence level in interpretation. Low kVp CTPAs had higher image noise. A significant decrease in the confidence levels for evaluation of mediastinal lymph nodes was observed at low kVp by one of two readers, although there was no significant correlation between accuracy of interpretation and kVp settings for lung and mediastinum lesion detection (adjusted odds ratios = 0.67-1.22, p values >0.2). While increased image noise may decrease the diagnostic confidence of the radiologist, the detection of lung nodules and enlarged mediastinal lymph nodes was not compromised. Referring clinicians can expect that lower radiation dose CTPA answers questions related to lungs and mediastinum. PMID:25082644

Kumamaru, Kanako K; Rybicki, Frank J; Madan, Rachna; Gill, Ritu; Wake, Nicole; Hunsaker, Andetta R

2014-12-01

122

A case of Robin sequence, microgastria, radiohumeral synostosis, femoral deficiency, and other unusual findings: a newly recognized syndrome?  

PubMed

In this report, we describe an 8-year-old male with Robin sequence, bilateral radiohumeral synostosis, microgastria, cryptorchidism, dislocated hips, proximal femoral deficiency, and an autism spectrum disorder. This combination of findings has not been previously reported. Features of particular interest are the radiohumeral synostosis and microgastria, both of which are rare defects, and to our knowledge, have not been reported to occur together. We propose that the patient has a newly recognized syndrome consisting of the aforementioned features, the etiology of which is unknown. PMID:24311538

Roberts, Jessica; Torres-Martinez, Wilfredo; Farrow, Emily; Stevens, Abby; Delk, Paula; White, Kenneth E; Weaver, David D

2014-02-01

123

Juvenile xanthogranuloma: unusual intraoral finding.  

PubMed

Juvenile xanthogranuloma is a rare non-Langerhans cell histiocytosis that usually presents as a self-limiting dermatological condition in young children. Rarely, extracutaneous sites may also be involved. We report a case in a 3-year-old girl that presented intraorally as a solitary, well-defined, soft, purple palatal swelling. Patients with these rare intraoral lesions may present to dentists and subsequently to oral and maxillofacial surgeons. Diagnosis requires histopathological analysis and immunohistochemical staining. Further investigation from other specialties is required to rule out involvement of other organ systems. PMID:25300889

Collins, L; Banks, R; Robinson, M

2015-01-01

124

Prediction of Nodal Involvement in Primary Rectal Carcinoma without Invasion to Pelvic Structures: Accuracy of Preoperative CT, MR, and DWIBS Assessments Relative to Histopathologic Findings  

PubMed Central

Objective To investigate the accuracy of preoperative computed tomography (CT), magnetic resonance (MR) imaging and diffusion-weighted imaging with background body signal suppression (DWIBS) in the prediction of nodal involvement in primary rectal carcinoma patients in the absence of tumor invasion into pelvic structures. Methods and Materials Fifty-two subjects with primary rectal cancer were preoperatively assessed by CT and MRI at 1.5 T with a phased-array coil. Preoperative lymph node staging with imaging modalities (CT, MRI, and DWIBS) were compared with the final histological findings. Results The accuracy of CT, MRI, and DWIBS were 57.7%, 63.5%, and 40.4%. The accuracy of DWIBS with higher sensitivity and negative predictive value for evaluating primary rectal cancer patients was lower than that of CT and MRI. Nodal staging agreement between imaging and pathology was fairly strong for CT and MRI (Kappa value?=?0.331 and 0.348, P<0.01) but was relatively weaker for DWIBS (Kappa value?=?0.174, P<0.05). The accuracy was 57.7% and 59.6%, respectively, for CT and MRI when the lymph node border information was used as the criteria, and was 57.7% and 61.5%, respectively, for enhanced CT and MRI when the lymph node enhancement pattern was used as the criteria. Conclusion MRI is more accurate than CT in predicting nodal involvement in primary rectal carcinoma patients in the absence of tumor invasion into pelvic structures. DWIBS has a great diagnostic value in differentiating small malignant from benign lymph nodes. PMID:24695111

Zhou, Jun; Zhan, Songhua; Zhu, Qiong; Gong, Hangjun; Wang, Yidong; Fan, Desheng; Gong, Zhigang; Huang, Yanwen

2014-01-01

125

Serial evaluation of high-resolution CT findings in patients with pneumonia in novel swine-origin influenza A (H1N1) virus infection  

PubMed Central

Objectives The purpose of our study was to review the changes in the serial high-resolution CT (HRCT) findings from patients with novel swine-origin influenza A (H1N1) virus (S-OIV) infection. Methods HRCT findings of 70 patients with presumed or laboratory-confirmed novel S-OIV infection were reviewed. The pattern (consolidation, ground glass, fibrosis and air trapping), distribution and extent of abnormality of the lesions on the HRCT were evaluated at different time points. To assess changes that occurred over time, the CT scans in 56 patients were examined in sequence. Results The most common CT findings in patients with S-OIV infection are ground-glass opacities with or without consolidation at the first week. The abnormalities peaked at the second week and resolved after that time, which resulted in substantial reduced residual disease at 4 weeks or later. The development of fibrosis was noted in the first week and peaked at the third week of illness (34.7%), then decreased slowly after that time. The mean time of air trapping being noted after the onset of symptoms was 55.5±20.6 days. Comparing the findings of initial CT, most results (96.4%) of follow-up chest CT findings showed improvement (p<0.01). Conclusion The abnormalities of ground-glass opacities and/or consolidation on initial CT scans tended to resolve to fibrosis, which then resolved completely or displayed substantially reduced residual disease. HRCT may show more changes in disease progression and play an important role in the evaluation of severe S-OIV. PMID:22167502

Li, P; Zhang, J-F; Xia, X-D; Su, D-J; Liu, B-L; Zhao, D-L; Liu, Y; Zhao, D-H

2012-01-01

126

Acute hemispheric stroke: Correlation between three-dimensional transcranial Doppler, MR-angiography, CT and clinical findings  

Microsoft Academic Search

We examined 50 ischemic stroke patients and 67 controls free of vascular disease, intra- or extracranial. We assessed all subjects clinically by neurological examination (quantified on the Canadian Neurological Scale or CNS), by three-dimensional transcranial Doppler sonography (TCD-3D) and by computed tomography (CT) within 24 h of the acute event, repeating CT 15 days later. 15 patients also underwent magnetic

S. Viola; M. G. Tenaglia; E. De Leonardis; L. Aquilone; D. Gambi

1993-01-01

127

Finding \\  

Microsoft Academic Search

Different data mining algorithms applied to the same data can result in similar findings, typically in the form of rules. These similarities can be exploited to identify especially powerful rules, in particular those that are common to the different algorithms. This research focuses on the independent application of association and classification mining algorithms to the same data to discover common

Karthik Rajasethupathy; Anthony Scime; Kulathur S. Rajasethupathy; Gregg R. Murray

2009-01-01

128

FDG PET-CT Finding in Bilateral Renal and Bone Involvement of Diffuse Large B-Cell Lymphoma  

PubMed Central

Thirty-six year old male patient with pathological fracture of the left tibia underwent intramedullary and soft tissue curettage. The histopathological examination revealed diffuse large B cell lymphoma. The patient underwent F18-FDG PET-CT scanning for initial staging. FDG PET-CT scan revealed hypermetabolic lesions at the left tibia and in bilateral kidneys. After the systemic chemotherapy and local radiotherapy to the tibia, repeated FDG PET/CT scan showed improvement of the previous hypermetabolic lesions, suggesting good response to therapy. Bone and renal involvement is an uncommon variant of diffuse large B-cell lymphoma and FDG PET-CT is an useful whole body imaging modality in these cases. PMID:25541935

Tan, Yusuf Ziya; Y?lmaz, Sabire; Özhan, Meftune; Halaç, Metin

2014-01-01

129

CT Findings of Risk Factors for Persistent Type II Endoleak from Inferior Mesenteric Artery to Determine Indicators of Preoperative IMA Embolization  

PubMed Central

Purpose: To identify the computed tomography (CT) findings of persistent type II endoleak from the inferior mesenteric artery (IMA) which indicate the need for preoperative IMA embolization. Materials and Methods: Included were 120 patients (96 males, 49–93 years old, mean: 77.7) who underwent endovascular aortic aneurysm repair (EVAR) between June 2007 and October 2010. The relationship between persistent type II endoleak and CT findings of IMA orifice was examined. Results: CT showed no type II endoleak from IMA in 106 patients (89%; Group N), and transient type II endoleak from IMA in 10 patients (8.3%; Group T). CT showed persistent type II endoleak from IMA in 4 patients (3.3%; Group P) and three of them underwent reintervention. Univariate Cox-Mantel test analysis indicated that stenosis (p = 0.0003) and thrombus (p = 0.043) in IMA orifice were significant factors for persistent type II endoleak. The ratios of patients with proximal IMA more than 2.5 mm diameter in Groups N, Y, and P were 26/106 (24%), 5/10 (50%) and 4/4 (100%), respectively. Conclusion: Indicators for embolization of IMA prior to EVAR for the prevention of type II endoleak appear to be: (1) more than 2.5 mm in diameter and (2) no stenosis due to calcification or mural thrombus in IMA orifice. PMID:25298829

Matsuda, Hitoshi; Sanda, Yoshihiro; Morita, Yoshiaki; Minatoya, Kenji; Kobayashi, Junjiro; Naito, Hiroaki

2014-01-01

130

Unusual families.  

PubMed

The introduction of assisted reproduction has led to unusual forms of procreation. This article describes the social consequences of lesbian motherhood and of families headed by single heterosexual mothers. PMID:15819999

Golombok, Susan

2005-03-01

131

Unusual presentation of rib exostosis  

Microsoft Academic Search

We report two cases of unusual presentation of rib exostosis. The first patient presented acutely with hemorrhagic shock due to massive hemothorax, and the second patient presented with repetitive chest infection complicated by empyema. In both patients, preoperative computed tomographic (CT) scan of the chest revealed rib exostoses, necessitating thoracotomy and rib resection.

Waseem M Hajjar; Yasser M El-Medany; Mohamed A Essa; Mohamad A Rafay; Mahmoud H Ashour; Khaled M Al-Kattan

2003-01-01

132

CT findings of pulmonary non-tuberculous mycobacterial infection in non-AIDS immunocompromised patients: a case-controlled comparison with immunocompetent patients  

PubMed Central

Objective: To describe CT findings of non-tuberculous mycobacteria (NTM) pulmonary infection in non-AIDS immunocompromised patients (ICPs) and to compare these findings with those in immunocompetent patients. Methods: From July 2000 to August 2007, 369 patients (mean age 58.3 years; 169 males and 200 females) with pulmonary NTM infection were retrospectively reviewed. Of these 369 patients, 24 ICPs (mean age 64.8 years; 15 males and 9 females) were identified. 16 patients had diabetes mellitus, and 6 patients had received long-term steroid therapy. One had received solid organ transplantation and one had received high-dose chemotherapy for haematological disease. 24 age- and sex-matched immunocompetent patients (mean age 64.6 years; 15 males and 9 females) were selected as the control group from the same registry. CT images were reviewed in consensus by three chest radiologists, who were blinded to immune status. Each lung lobe was evaluated in terms of extent of the lesion, bronchiectasis, parenchymal opacity and the presence of ancillary findings. Results: A total of 287 lobes were evaluated in ICPs and the control group. The ICPs showed a higher prevalence of ill-defined nodules, with cavities and large opacity >2?cm with/without cavity (p=0.03, 0.04 and 0.02, respectively). Regardless of the immune status, the most common CT findings were bronchiectasis and ill-defined nodules without cavity. Conclusion: The most common CT findings of pulmonary NTM infection in ICPs were bronchiectasis and ill-defined nodules, similar to those in the control group. Ill-defined nodules with cavity and large opacity >2?cm with/without cavity were more frequently found in ICPs. Advances in knowledge: In patients affected by NTM infection, large opacities and cavitation in pulmonary nodules are more frequent in ICPs than in immunocompetent patients. PMID:23440166

Lee, Y; Chae, E J; Lee, H J; Lee, C-W; Do, K-H; Seo, J B; Kim, M-Y; Lee, J S; Song, K-S; Shim, T S

2013-01-01

133

Evaluation by SPECT-CT of an incidental finding of a thymoma and breast cancer in a myocardial perfusion SPECT with 99mTc-MIBI.  

PubMed

We present a case of a 78-year-old female with effort angina. A myocardial perfusion SPECT (MPS) showed increased tracer uptake in two synchronic tumor lesions, a thymoma and a breast cancer. This case highlights the contribution of SPECT-CT in the characterization of these findings and its essential role in rapid decision-making. The patient underwent surgery of both lesions that had gone undetected prior to the conduction of the MPS. PMID:23267742

García-Talavera, P; Olmos, R; Sainz-Esteban, A; Ruiz, M Á; González, M L; Gamazo, C

2013-01-01

134

Scanning Beyond Anatomic Limits of the Thorax in Chest CT: Findings, Radiation Dose, and Automatic Tube Current Modulation  

Microsoft Academic Search

OBJECTIVE. Our objective was to determine additional radiation dose associated with scanning beyond the anatomic limits of the thorax in chest CT protocol and to assess the effect of z-axis modulation on the additional radiation dose associated with the scanning protocol. MATERIALS AND METHODS. \\

Justin Campbell; Mannudeep K. Kalra; Stefania Rizzo; Michael M. Maher; Jo-Anne Shepard; Kalra MK; Maher MM; Shepard J-A

2005-01-01

135

75 FR 38148 - Finding of No Significant Impact Related to Approval of the Mallinckrodt C-T Phase 2...  

Federal Register 2010, 2011, 2012, 2013, 2014

...products including metallic oxides and salts, ammonia...MED-AEC) to process uranium ore to produce uranium...materials containing uranium and thorium isotopes...extracted C-T from natural uranium ores and tin slags...equipment to the extent necessary, to meet NRC's...

2010-07-01

136

[Findings of the (18)F-FDG PET-CT in a cardiac angiosarcoma complicated by a cardiac rupture].  

PubMed

Primary malignant tumors of the heart are a rare condition. The most common type is the cardiac angiosarcoma. The symptoms of this disease are very nonspecific and can be very difficult to diagnose by conventional imaging techniques. We report the case of a male patient with cardiac angiosarcoma who also had a rare complication, this being cardiac rupture, which required the use of (18)F-FDG PET-CT to demonstrate the mass malignancy and to reach a definitive diagnosis. PMID:23810660

Santiago-Chinchilla, Alicia; Ruiz-Carazo, Eduardo; Moral-Ruiz, Antonio; Testart Dardel, Nathalie; Martínez-Martínez, Alberto; López-Fernández, Silvia

2014-01-01

137

Quantitative assessment of left ventricular function with dual-source CT in comparison to cardiac magnetic resonance imaging: initial findings  

Microsoft Academic Search

Cardiac magnetic resonance imaging and echocardiography are currently regarded as standard modalities for the quantification\\u000a of left ventricular volumes and ejection fraction. With the recent introduction of dual-source computedtomography (DSCT),\\u000a the increased temporal resolution of 83 ms should also improve the assessment of cardiac function in CT. The aim of this study\\u000a was to evaluate the accuracy of DSCT in the

S. Busch; T. R. C. Johnson; B. J. Wintersperger; N. Minaifar; A. Bhargava; C. Rist; M. F. Reiser; C. Becker; K. Nikolaou

2008-01-01

138

Immediate periodontal bone plate changes induced by rapid maxillary expansion in the early mixed dentition: CT findings  

PubMed Central

Objective This study aimed at evaluating buccal and lingual bone plate changes caused by rapid maxillary expansion (RME) in the mixed dentition by means of computed tomography (CT). Methods The sample comprised spiral CT exams taken from 22 mixed dentition patients from 6 to 9 years of age (mean age of 8.1 years) presenting constricted maxillary arch treated with Haas-type expanders. Patients were submitted to spiral CT scan before expansion and after the screw activation period with a 30-day interval between T1 and T2. Multiplanar reconstruction was used to measure buccal and lingual bone plate thickness and buccal bone crest level of maxillary posterior deciduous and permanent teeth. Changes induced by expansion were evaluated using paired t test (p < 0.05). Results Thickness of buccal and lingual bone plates of posterior teeth remained unchanged during the expansion period, except for deciduous second molars which showed a slight reduction in bone thickness at the distal region of its buccal aspect. Buccal bone dehiscences were not observed in the supporting teeth after expansion. Conclusion RME performed in mixed dentition did not produce immediate undesirable effects on periodontal bone tissues. PMID:25162564

Garib, Daniela Gamba; Menezes, Maria Helena Ocké; da Silva Filho, Omar Gabriel; dos Santos, Patricia Bittencourt Dutra

2014-01-01

139

Retrospective analysis of incidental non-trauma associated findings in severely injured patients identified by whole-body spiral CT scans  

PubMed Central

Background Whole-body Computed Tomography (CT) scan today is considered a crucial imaging technique in the diagnostic work-up of polytrauma patients implicating a potential survival benefit. Apart from prompt identification of life threatening injuries this imaging technique provides an additional benefit by diagnosing incidental non-trauma associated medical diseases. These incidental findings might be also life threatening and warrant urgent therapy. The downside of whole-body CT is a relatively high radiation exposure that might result in an increased life time cancer risk. The aim of this study was to investigate the frequency and type of non trauma associated incidental medical findings in relation to patient age and potential clinical relevance. Methods Between January 1st 2011 and December 15th 2012, a total of 704 trauma patients were referred to our hospital’s emergency room that triggered trauma room alarm according to our trauma mechanism criteria. Of these 534 (75.8%) received a whole-body CT according to our dedicated multiple trauma protocol. Incidental Findings (IF) were assigned in three groups according to their clinical relevance. Category 1: IF with high medical relevance (urgent life threatening conditions, unless treated) needing early investigations and intervention prior to or shortly after hospital discharge. Category 2: IF with intermediate or low medical relevance, warranting further investigations. Category 3: IF without clinical relevance. Results Overall 231 IFs (43.3%) were identified, 36 (6.7%) patients had IFs with a high clinical relevance, 48 (9.0%) with a moderate or minor clinical relevance and 147 (27.5%) with no clinical relevance. The distribution of incidental findings with high or moderate relevance according to age showed an incidence of 2.6%, 6.6% and 8.8% for patients younger than 40 years, 40 to 60 years and older than 60 years, respectively. Conclusion Whole-body CT scans of trauma patients demonstrate a high rate of incidental findings. Potentially life-threatening, medical findings were found in approximately every 15th patient, predominantly aged over 40 years and presenting with minor to moderate injuries and an Injury Severity Score (ISS) of 10 or less. PMID:25187791

2014-01-01

140

18F-FDG PET/CT findings in a patient with isolated intracranial Rosai-Dorfman disease.  

PubMed

Rosai-Dorman disease (RDD) or sinus histiocytosis with massive lymphadenopathy is a rare histiocytic disorder first described in 1969. RDD involving the central nervous system is considered to be rare, with fewer than 120 cases reported in the literature. We present a 51-year-old woman with a history of panhypopituitarism, episodic memory disturbance, and a hypothalamic tumor. Stereotaxic hypothalamic lesion biopsy showed histiocytic proliferation positive for S100 protein and CD68, but negative for CD1a, typical for RDD. ¹?F-FDG PET/CT 4 months later demonstrated increased hypothalamic metabolic activity. PMID:23242068

Deshayes, Emmanuel; Le Berre, Jean-Philippe; Jouanneau, Emmanuel; Vasiljevic, Alexandre; Raverot, Gérald; Seve, Pascal

2013-01-01

141

Mass General study finds laxative-free CT colonography may be as accurate as colonoscopy in detecting high-risk polyps  

Cancer.gov

A CT-scan-based form of virtual colonoscopy that does not require laxative preparation appears to be as effective as standard colonoscopy in identifying the intestinal polyps most likely to become cancerous. In the May 15 issue of Annals of Internal Medicine, a Massachusetts General Hospital-based research team reports finding that the new technique, which uses computer-aided systems both to virtually cleanse and to analyze the images acquired, was able to identify more than 90 percent of the common polyps called adenomas that were 10 mm or larger.

142

Rare solitary focal tuberculous involvement of liver masquerading as hepatic metastasis on FDG PET/CT in a case of fibular round cell tumor  

PubMed Central

Finding of focal 18F-fluoro-deoxyglucose (FDG) uptake in liver on FDG positron emission tomography/computed tomography (FDG PET/CT) in a known case of malignancy is often considered to be metastases. We report a similar finding on FDG PET/CT in a case of Ewing's sarcoma of thigh, which turned out to be of tuberculous etiology, an unusual cause of false positive FDG uptake in the liver. PMID:25589811

Puranik, Ameya D; Purandare, Nilendu C; Sridhar, Epari; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2015-01-01

143

Rare solitary focal tuberculous involvement of liver masquerading as hepatic metastasis on FDG PET/CT in a case of fibular round cell tumor.  

PubMed

Finding of focal 18F-fluoro-deoxyglucose (FDG) uptake in liver on FDG positron emission tomography/computed tomography (FDG PET/CT) in a known case of malignancy is often considered to be metastases. We report a similar finding on FDG PET/CT in a case of Ewing's sarcoma of thigh, which turned out to be of tuberculous etiology, an unusual cause of false positive FDG uptake in the liver. PMID:25589811

Puranik, Ameya D; Purandare, Nilendu C; Sridhar, Epari; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2015-01-01

144

Inhibition of fibrosis and inflammation by triple therapy with pirfenidone, edaravone and erythropoietin in rabbits with drug-induced lung injury: comparison of CT imaging and pathological findings  

PubMed Central

In a rabbit model of bleomycin-induced lung injury, computed tomography (CT) and pathological studies were conducted to investigate whether the progression of this injury is inhibited by pirfenidone and by triple therapy with pirfenidone, edaravone and erythropoietin. We divided nine rabbits with bleomycin-induced lung injury into three equally sized groups. Group 1 served as the control, group 2 received pirfenidone alone and group 3 was treated with pirfenidone, edaravone and erythropoietin. Multidetector CT (MDCT) scans were acquired immediately after the administration of bleomycin, and further scans were performed on days 14 and 28. The area of abnormal opacity was calculated. The rabbit lungs were removed and the size of abnormal areas in macroscopic specimens was calculated and the degree of fibrosis and inflammation in microscopic specimens was scored. In order, the average size of the area of abnormal opacity on CT scans was largest in group 1, followed by groups 2 and 3. On day 28, the area of opacity was significantly smaller in group 3 than in group 1 (P=0.071). The average size of the area of abnormal opacity on macroscopic findings was largest in group 1, followed in order by groups 2 and 3; the difference between group 1 and 3 was significant (P<0.05). The average fibrosis score was highest in group 3 followed by groups 2 and 1. By contrast, the average inflammation score was highest in group 2 followed by groups 1 and 3. Although the administration of pirfenidone alone slowed the progression of bleomycin-induced lung injury, the triple-drug combination was more effective. PMID:24223628

WATANABE, SHOBU; NITTA, NORIHISA; SONODA, AKINAGA; NITTA-SEKO, AYUMI; OHTA, SHINICHI; TSUCHIYA, KEIKO; OTANI, HIDEJI; TOMOZAWA, YUKI; NAGATANI, YUKIHIRO; MUKAISHO, KENICHI; TAKAHASHI, MASASHI; MURATA, KIYOSHI

2013-01-01

145

Inhibition of fibrosis and inflammation by triple therapy with pirfenidone, edaravone and erythropoietin in rabbits with drug-induced lung injury: comparison of CT imaging and pathological findings.  

PubMed

In a rabbit model of bleomycin-induced lung injury, computed tomography (CT) and pathological studies were conducted to investigate whether the progression of this injury is inhibited by pirfenidone and by triple therapy with pirfenidone, edaravone and erythropoietin. We divided nine rabbits with bleomycin-induced lung injury into three equally sized groups. Group 1 served as the control, group 2 received pirfenidone alone and group 3 was treated with pirfenidone, edaravone and erythropoietin. Multidetector CT (MDCT) scans were acquired immediately after the administration of bleomycin, and further scans were performed on days 14 and 28. The area of abnormal opacity was calculated. The rabbit lungs were removed and the size of abnormal areas in macroscopic specimens was calculated and the degree of fibrosis and inflammation in microscopic specimens was scored. In order, the average size of the area of abnormal opacity on CT scans was largest in group 1, followed by groups 2 and 3. On day 28, the area of opacity was significantly smaller in group 3 than in group 1 (P=0.071). The average size of the area of abnormal opacity on macroscopic findings was largest in group 1, followed in order by groups 2 and 3; the difference between group 1 and 3 was significant (P<0.05). The average fibrosis score was highest in group 3 followed by groups 2 and 1. By contrast, the average inflammation score was highest in group 2 followed by groups 1 and 3. Although the administration of pirfenidone alone slowed the progression of bleomycin-induced lung injury, the triple-drug combination was more effective. PMID:24223628

Watanabe, Shobu; Nitta, Norihisa; Sonoda, Akinaga; Nitta-Seko, Ayumi; Ohta, Shinichi; Tsuchiya, Keiko; Otani, Hideji; Tomozawa, Yuki; Nagatani, Yukihiro; Mukaisho, Kenichi; Takahashi, Masashi; Murata, Kiyoshi

2013-11-01

146

Hemoperitoneum caused by hepatic necrosis and rupture following a snakebite: a case report with rare CT findings and successful embolization.  

PubMed

We report the computed tomographic and angiographic findings in the case of a recently obtained successful clinical outcome after embolization of the hepatic artery in the case of a snakebite causing hemoperitoneum associated with hepatic necrosis and rupture with active bleeding. PMID:18071289

Ahn, Jae Hong; Yoo, Dong Gon; Choi, Soo-Jung; Lee, Jong Hyeog; Park, Man Soo; Kwak, Jin Ho; Jung, Seung Mun; Ryu, Dae Shick

2007-01-01

147

Hemoperitoneum Caused by Hepatic Necrosis and Rupture Following a Snakebite: a Case Report with Rare CT Findings and Successful Embolization  

PubMed Central

We report the computed tomographic and angiographic findings in the case of a recently obtained successful clinical outcome after embolization of the hepatic artery in the case of a snakebite causing hemoperitoneum associated with hepatic necrosis and rupture with active bleeding. PMID:18071289

Ahn, Jae Hong; Yoo, Dong Gon; Choi, Soo-Jung; Lee, Jong Hyeog; Park, Man Soo; Kwak, Jin Ho; Ryu, Dae Shick

2007-01-01

148

Clinically-Important Brain Injury and CT Findings in Pediatric Mild Traumatic Brain Injuries: A Prospective Study in a Chinese Reference Hospital  

PubMed Central

This study investigated injury patterns and the use of computed tomography (CT) among Chinese children with mild traumatic brain injury (MTBI). We enrolled children with MTBI who were treated within 24 hours of head trauma in the emergency department of Wuhan Medical Care Center for Women and Children in Wuhan, China. Characteristics of MTBIs were analyzed by age and gender. Results of cranial CT scan and clinically-important brain injury (ciTBI) for children were obtained. The definition of ciTBI was: death from TBI, intubation for more than 24 h for TBI, neurosurgery, or hospital admission of 2 nights or more. Of 455 eligible patients with MTBI, ciTBI occurred in two, and no one underwent neurosurgical intervention. CT scans were performed for 441 TBI patients (96.9%), and abnormal findings were reported for 147 patients (33.3%, 95% CI 29.0–37.8). Falls were the leading cause of MTBI (61.5%), followed by blows (18.9%) and traffic collisions (14.1%) for children in the 0–2 group and 10–14 group. For children aged between 3 and 9, the top three causes of TBI were falls, traffic collisions and blows. Leisure activity was the most reported activity when injuries occurred for all age groups. Sleeping/resting and walking ranked in the second and third place for children between 0 and 2 years of age, and walking and riding for the other two groups. The places where the majority injuries occurred were the home for the 0–2 and 3–9 years of age groups, and school for the 10–14 years of age group. There was no statistical difference between boys and girls with regard to the activity that caused the MTBI. This study highlights the important roles that parents and school administrators in the development of preventive measures to reduce the risk of traumatic brain injury in children. Also, identifying children who had a head trauma at very low risk of clinically important TBI for whom CT might be unnecessary is a priority area of research in China. PMID:24675642

Zhu, Huiping; Gao, Qi; Xia, Xin; Xiang, Joe; Yao, Hongli; Shao, Jianbo

2014-01-01

149

Clinically-important brain injury and CT findings in pediatric mild traumatic brain injuries: a prospective study in a Chinese reference hospital.  

PubMed

This study investigated injury patterns and the use of computed tomography (CT) among Chinese children with mild traumatic brain injury (MTBI). We enrolled children with MTBI who were treated within 24 hours of head trauma in the emergency department of Wuhan Medical Care Center for Women and Children in Wuhan, China. Characteristics of MTBIs were analyzed by age and gender. Results of cranial CT scan and clinically-important brain injury (ciTBI) for children were obtained. The definition of ciTBI was: death from TBI, intubation for more than 24 h for TBI, neurosurgery, or hospital admission of 2 nights or more. Of 455 eligible patients with MTBI, ciTBI occurred in two, and no one underwent neurosurgical intervention. CT scans were performed for 441 TBI patients (96.9%), and abnormal findings were reported for 147 patients (33.3%, 95% CI 29.0-37.8). Falls were the leading cause of MTBI (61.5%), followed by blows (18.9%) and traffic collisions (14.1%) for children in the 0-2 group and 10-14 group. For children aged between 3 and 9, the top three causes of TBI were falls, traffic collisions and blows. Leisure activity was the most reported activity when injuries occurred for all age groups. Sleeping/resting and walking ranked in the second and third place for children between 0 and 2 years of age, and walking and riding for the other two groups. The places where the majority injuries occurred were the home for the 0-2 and 3-9 years of age groups, and school for the 10-14 years of age group. There was no statistical difference between boys and girls with regard to the activity that caused the MTBI. This study highlights the important roles that parents and school administrators in the development of preventive measures to reduce the risk of traumatic brain injury in children. Also, identifying children who had a head trauma at very low risk of clinically important TBI for whom CT might be unnecessary is a priority area of research in China. PMID:24675642

Zhu, Huiping; Gao, Qi; Xia, Xin; Xiang, Joe; Yao, Hongli; Shao, Jianbo

2014-04-01

150

The Multi-Detector CT findings of giant abdominal lymphangiectasis mimicking a mesenteric cystic mass in a patient with midgut volvulus  

PubMed Central

Our purpose is to show the Multi-Detector CT (MDCT) findings of an intra-abdominal giant cystic lesion with midgut volvulus and to share our experience with giant lymphangiectasis mimicking a mesenteric cyst or a cystic mass. The pathological evaluation indicated that the cyst contained abdominal lymphatic material. Malrotation is usually detected in infants and children, but rarely in adults. In patients with chronic and recurrent volvulus, chronic venous congestion with lymphatic engorgement may occur. Interference with lymphatic drainage may result in formation of a lymphangioma or a chylous mesenteric cyst. In our case, because of the intestinal lymphatic torsion, there was a cystic lesion mimicking a mesenteric cyst or a cystic mass. To our knowledge, this is the first case of midgut volvulus and large mesenteric lymphangiectasis to be depicted by MDCT.

Kantarci, Mecit; Doganay, Selim; Kurtcan, Serpil; Gundogdu, Cemal; Oral, Akgun; Demir, Berrin

2008-01-01

151

Vascular thrombosis as a cause of abdominal pain in a patient with neuroendocrine carcinoma of pancreas: Findings on (68)Ga-DOTANOC PET/CT.  

PubMed

Neuroendocrine tumors of pancreas are relatively rare neoplasms and are classified as either functioning or non-functioning tumors. A 55-year-old female diagnosed with a large, well-differentiated, non-functional neuroendocrine carcinoma of pancreas, presented with abdominal pain of increasing severity. A contrast-enhanced examination of the abdomen was performed to reveal a large, diffuse, enhancing pancreatic mass with multiple filling defects within the mesenteric vasculature. We present findings on (68)Ga-labeled [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid]-1-NaI(3)-Octreotide, positron emission tomography-computed tomography ((68)Ga-DOTANOC PET/CT) and the importance of somatostatin receptor-based PET imaging in such patients. PMID:23599597

Naswa, Niraj; Kumar, Rakesh; Bal, Chandrasekhar; Malhotra, Arun

2012-01-01

152

Vascular thrombosis as a cause of abdominal pain in a patient with neuroendocrine carcinoma of pancreas: Findings on 68Ga-DOTANOC PET/CT  

PubMed Central

Neuroendocrine tumors of pancreas are relatively rare neoplasms and are classified as either functioning or non-functioning tumors. A 55-year-old female diagnosed with a large, well-differentiated, non-functional neuroendocrine carcinoma of pancreas, presented with abdominal pain of increasing severity. A contrast-enhanced examination of the abdomen was performed to reveal a large, diffuse, enhancing pancreatic mass with multiple filling defects within the mesenteric vasculature. We present findings on 68Ga-labeled [1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid]-1-NaI3-Octreotide, positron emission tomography-computed tomography (68Ga-DOTANOC PET/CT) and the importance of somatostatin receptor-based PET imaging in such patients. PMID:23599597

Naswa, Niraj; Kumar, Rakesh; Bal, Chandrasekhar; Malhotra, Arun

2012-01-01

153

[Recommendations for reporting benign asbestos-related findings in chest X-ray and CT to the accident insurances].  

PubMed

Asbestos-related diseases still play an important role in occupational medicine. The detection of benign asbestos-related diseases is one condition for the compensation of asbestos-related lung cancer in Germany. Due to the increasing use of computed tomography, asbestos-related diseases are more frequently detected in the early stages. The present article proposes recommendations for the findings which have to be reported as suspicious for being asbestos-related based on a) chest X-rays and b) computed tomography using the International Classification System for Occupational and Environmental Respiratory Diseases (ICOERD). PMID:19937572

Kraus, T; Borsch-Galetke, E; Elliehausen, H J; Frank, K; Hering, K G; Hieckel, H G; Hofmann-Preiss, K; Jacques, W; Jeremie, U; Kotschy-Lang, N; Mannes, E; Otten, H; Raab, W; Raithel, H J; Schneider, W D; Tuengerthal, S

2009-12-01

154

The added value of hybrid ventilation/perfusion SPECT/CT in patients with stable COPD or apparently healthy smokers. Cancer-suspected CT findings in the lungs are common when hybrid imaging is used  

PubMed Central

Ventilation/perfusion (V/P) single-photon emission computed tomography (SPECT) is recognized as a diagnostic method with potential beyond the diagnosis of pulmonary embolism. V/P SPECT identifies functional impairment in diseases such as heart failure (HF), pneumonia, and chronic obstructive pulmonary disease (COPD). The development of hybrid SPECT/computed tomography (CT) systems, combining functional with morphological imaging through the addition of low-dose CT (LDCT), may be useful in COPD, as these patients are prone to lung cancer and other comorbidities. The aim of this study was to investigate the added value of LDCT among healthy smokers and patients with stable COPD, when examined with V/P SPECT/CT hybrid imaging. Sixty-nine subjects, 55 with COPD (GOLD I–IV) and 14 apparently healthy smokers, were examined with V/P SPECT and LDCT hybrid imaging. Spirometry was used to verify COPD grade. Only one apparently healthy smoker and three COPD patients had a normal or nearly normal V/P SPECT. All other patients showed various degrees of airway obstruction, even when spirometry was normal. The same interpretation was reached on both modalities in 39% of the patients. LDCT made V/P SPECT interpretation more certain in 9% of the patients and, in 52%, LDCT provided additional diagnoses. LDCT better characterized the type of emphysema in 12 patients. In 19 cases, tumor-suspected changes were reported. Three of these 19 patients (ie, 4.3% of all subjects) were in the end confirmed to have lung cancer. The majority of LDCT findings were not regarded as clinically significant. V/P SPECT identified perfusion patterns consistent with decompensated left ventricular HF in 14 COPD patients. In 16 patients (23%), perfusion defects were observed. HF and perfusion defects were not recognized with LDCT. In COPD patients and long-time smokers, hybrid imaging had added value compared to V/P SPECT alone, by identifying patients with lung malignancy and more clearly identifying emphysema. V/P SPECT visualizes comorbidities to COPD not seen with LDCT, such as pulmonary embolism and left ventricular HF.

Jögi, Jonas; Markstad, Hanna; Tufvesson, Ellen; Bjermer, Leif; Bajc, Marika

2015-01-01

155

The added value of hybrid ventilation/perfusion SPECT/CT in patients with stable COPD or apparently healthy smokers. Cancer-suspected CT findings in the lungs are common when hybrid imaging is used.  

PubMed

Ventilation/perfusion (V/P) single-photon emission computed tomography (SPECT) is recognized as a diagnostic method with potential beyond the diagnosis of pulmonary embolism. V/P SPECT identifies functional impairment in diseases such as heart failure (HF), pneumonia, and chronic obstructive pulmonary disease (COPD). The development of hybrid SPECT/computed tomography (CT) systems, combining functional with morphological imaging through the addition of low-dose CT (LDCT), may be useful in COPD, as these patients are prone to lung cancer and other comorbidities. The aim of this study was to investigate the added value of LDCT among healthy smokers and patients with stable COPD, when examined with V/P SPECT/CT hybrid imaging. Sixty-nine subjects, 55 with COPD (GOLD I-IV) and 14 apparently healthy smokers, were examined with V/P SPECT and LDCT hybrid imaging. Spirometry was used to verify COPD grade. Only one apparently healthy smoker and three COPD patients had a normal or nearly normal V/P SPECT. All other patients showed various degrees of airway obstruction, even when spirometry was normal. The same interpretation was reached on both modalities in 39% of the patients. LDCT made V/P SPECT interpretation more certain in 9% of the patients and, in 52%, LDCT provided additional diagnoses. LDCT better characterized the type of emphysema in 12 patients. In 19 cases, tumor-suspected changes were reported. Three of these 19 patients (ie, 4.3% of all subjects) were in the end confirmed to have lung cancer. The majority of LDCT findings were not regarded as clinically significant. V/P SPECT identified perfusion patterns consistent with decompensated left ventricular HF in 14 COPD patients. In 16 patients (23%), perfusion defects were observed. HF and perfusion defects were not recognized with LDCT. In COPD patients and long-time smokers, hybrid imaging had added value compared to V/P SPECT alone, by identifying patients with lung malignancy and more clearly identifying emphysema. V/P SPECT visualizes comorbidities to COPD not seen with LDCT, such as pulmonary embolism and left ventricular HF. PMID:25565797

Jögi, Jonas; Markstad, Hanna; Tufvesson, Ellen; Bjermer, Leif; Bajc, Marika

2015-01-01

156

Evaluation of the relationship between smear positivity and high-resolution CT findings in children with pulmonary tuberculosis  

PubMed Central

Summary Background The aim of this study is to find a relationship between the radiological manifestations of childhood tuberculosis on a high-resolution computed tomography (HRCT) and the results of sputum smear. This study aims to propose an alternative indicator of infectivity in terms of prevention of disease transmission through selective isolation policy in children whose clinical condition is highly suggestive of tuberculosis. Material/Methods This retrospective comparative study was performed on 95 children under 15 years of age diagnosed with tuberculosis based on both WHO criteria and positive sputum culture for mycobacterium Tuberculosis. The children were admitted for TB screening in the pediatric department of national research institute of tuberculosis and lung disease (NRITLD) between 2008–2012. Direct smear collected from sputum or gastric lavage, as well as HRCT were performed in all children prior to administration of medical therapy. Children were divided into 2 groups based on positive and negative smear results. HRCT abnormalities, as well as their anatomical distribution were compared between these 2 groups using multivariate analytic model. Results The most prevalent abnormalities in the positive smear group were consolidation, tree-in-bud pattern, upper lobe nodular infiltration and cavitation. The negative smear group featured lymphadenopathy, consolidation, collapse and nodular infiltration in the upper lobe. Cavity, tree- in-bud pattern and upper lobe nodular infiltration were highly associated with smear positivity in children. Conversely, lymphadenopathy and collapse had significant association with a negative smear. Conclusions This study revealed that cavity, tree-in-bud and upper lobe nodular infiltration has significant association with smear positivity in childhood tuberculosis. On the other hand, lymphadenopathy and collapse were closely associated with smear negativity in this age group. It was also demonstrated that children with a positive smear most likely presented with radiological features of post primary tuberculosis, while the negative smear group most often manifested with primary tuberculosis. PMID:24883144

Bolursaz, Mohammad Reza; Mehrian, Payam; Aghahosseini, Farahnaz; Lotfian, Ferial; Khalilzadeh, Soheila; Baghaie, Nooshin; Hassanzad, Maryam; Velayati, Ali Akbar

2014-01-01

157

A case of boomerang dysplasia with a novel causative mutation in filamin B: identification of typical imaging findings on ultrasonography and 3D-CT imaging.  

PubMed

Boomerang dysplasia is a rare lethal osteochondrodysplasia characterized by disorganized mineralization of the skeleton, leading to complete nonossification of some limb bones and vertebral elements, and a boomerang-like aspect to some of the long tubular bones. Like many short-limbed skeletal dysplasias with accompanying thoracic hypoplasia, the potential lethality of the phenotype can be difficult to ascertain prenatally. We report a case of boomerang dysplasia prenatally diagnosed by use of ultrasonography and 3D-CT imaging, and identified a novel mutation in the gene encoding the cytoskeletal protein filamin B (FLNB) postmortem. Findings that aided the radiological diagnosis of this condition in utero included absent ossification of two out of three long bones in each limb and elements of the vertebrae and a boomerang-like shape to the ulnae. The identified mutation is the third described for this disorder and is predicted to lead to amino acid substitution in the actin-binding domain of the filamin B molecule. PMID:22354125

Tsutsumi, Seiji; Maekawa, Ayako; Obata, Miyuki; Morgan, Timothy; Robertson, Stephen P; Kurachi, Hirohisa

2012-01-01

158

Unusual fundus examination findings in tuberculous meningitis  

PubMed Central

Vision impairment is one of the devastating complications of central nervous system tuberculosis (CNS TB). Optic atrophy is a sequelae of various forms of CNS TB which, ultimately, is responsible for vision impairment. It is usually the secondary optic atrophy which occurs in CNS TB. In this case report, we present two cases of CNS tuberculosis developing primary optic atrophy, which is infrequently reported. The relevant pathophysiology and causes of vision impairment in CNS TB are also discussed. PMID:23396930

Verma, Rajesh; Chaudhari, Tejendra S

2013-01-01

159

Giant ovarian cyst--an unusual finding.  

PubMed

A 16 year old unmarried girl presented with complaints of abdominal distension, vomiting, constipation, difficulty in breathing and restlessness. On examination abdomen was grossly distended with fluid thrill. Ultrasonographic examination revealed that there was a huge cystic collection with internal debris, multiple septations involving the whole abdomen and pelvis originating from right ovary. The left ovary was normal. Her laparatomy was done. A giant ovarian cyst measuring 45 x 32 x 28 cm, which weighed 18 Kg (almost 1/3 of whole body weight), was removed as such like a yoyo balloon. Post-operative recovery was smooth. Histopathological examination revealed that it was mucinous cystadenoma. PMID:25603687

Mehboob, Mukhtar; Naz, Samina; Zubair, Muhammad; Kasi, Muhammad Ashraf

2014-01-01

160

Unusual spacecraft materials  

NASA Technical Reports Server (NTRS)

For particularly innovative space exploration missions, unusual requirements are levied on the structural components of the spacecraft. In many cases, the preferred solution is the utilization of unusual materials. This trend is forecast to continue. Several hypothetic examples are discussed.

Post, Jonathan V.

1990-01-01

161

The more you look, the more you find: challenging results on FDG-PET CT in a patient with neurofibromatosis type I  

PubMed Central

Background FDG-PET/CT is part of the standard diagnostic management of a patients with a large variety of common and less common malignant tumors, based on the increased glucose metabolism within tumors. Case presentation A hybrid fluorodeoxyglucose positron emission tomography and computed tomography (FDG-PET/CT) was performed in a neurofibromatosis patient to rule out relapse of malignant peripheral nerve sheet tumor. The scan revealed non-malignant neurofibromas, a testis seminoma and hypermetabolic syphilitic granulomata. Conclusion This case stresses the need to rule out infectious diseases when atypical hypermetabolic lesions are present. PMID:24885974

2014-01-01

162

Chemical-shift MRI of rebound thymic hyperplasia with unusual appearance and intense (18)F-FDG uptake in adulthood: report of two cases.  

PubMed

Rebound thymic hyperplasia (RTH) with increased (18)F-FGD uptake at positron emission tomography (PET) computed tomography (CT) is typical of pediatric patients after chemotherapy, although it may occasionally occur in adults. At CT, RTH usually appears as a diffusely enlarged thymus with areas of fatty attenuation. We report two cases of RTH in adults detected at follow-up: both showed unusual morphology on CT and were confirmed at PET-CT as areas of strongly increased radiopharmaceutical uptake, which suggested disease recurrence. Chemical-shift magnetic resonance imaging, however, demonstrated fat infiltration within the tissue. Such finding was consistent with the diagnosis of RTH and was paramount in preventing unnecessary invasive procedures or treatments. PMID:24667047

Priola, Adriano Massimiliano; Priola, Sandro Massimo

2014-01-01

163

CT and MR Imaging Findings and Their Implications in the Follow-up of Patients with Intracranial Aneurysms Treated with Endosaccular Occlusion with Onyx  

Microsoft Academic Search

BACKGROUND AND PURPOSE: Our purpose was to describe the CT and MR features of intracranial aneurysms occluded with the liquid polymer Onyx. METHODS: At two centers, 35 aneurysms in 33 patients and 11 in nine patients were treated with the polymer. In 17 patients, adjunctive stents were placed at the aneurysm neck. All but three aneurysms originated from the internal

Isil Saatci; H. Saruhan Cekirge; Elisa F. M. Ciceri; Michel E. Mawad; A. Gulsun Pamuk; Aytekin Besim

164

Correlation of clinical findings, duplex carotid artery scanning and CT scanning of the brain in 54 consecutive patients with bruits over the carotid artery bifurcation.  

PubMed Central

Fifty-four patients presenting consecutively with bruits over the carotid artery bifurcation have been studied by Duplex ultrasonography of the carotid artery and CT of the brain. The patients were divided into symptomatic (transient ischaemic attacks (TIA), non-focal neurological symptoms, minor and major strokes) and asymptomatic groups. The duplex scans were subdivided into those showing a greater than 50% stenosis of the internal carotid artery and those with a less than 50% stenosis. The CT brain scans were subdivided into those showing evidence of cerebral infarction and those without. Symptomatic patients were found to be more likely to have an area of cerebral infarction than asymptomatic ones (P = 0.0086 Fisher's Exact Test). Patients with a significant stenosis (greater than 50%) of the internal carotid artery were more likely to have an ipsilateral cerebral infarction on CT than patients with a minor stenosis (less than 50% stenosis) (P = 0.028 Fisher's Exact Test). Three patients (two with TIA's and one with non-focal neurological symptoms) were found to have unsuspected cerebral infarcts on CT of the brain. These patients could theoretically be at risk following carotid endarterectomy and revascularization if the infarct were an early one. Patients with non-focal neurological symptoms and carotid bruit were more likely to have a significant stenosis than asymptomatic patients with carotid bruit (P = 0.0069 Fisher's Exact Test). Therapy should be directed at the carotid artery lesion in these cases. Duplex scanning of the carotid artery bifurcation may be combined usefully with CT brain scanning in the non-invasive investigation of patients with symptomatic extracranial carotid artery bruits. PMID:3898969

Englund, R.; Fairgrieve, J.; Brown, P. F.; Brock, M.; Shedden, E. J.; Aldoori, M. I.

1985-01-01

165

Primary epiploic appendagitis: CT diagnosis  

Microsoft Academic Search

The purpose of this study was to analyze the CT signs of primary epiploic appendagitis. A retrospective search of the CT database over 12 months for this diagnosis revealed 11 cases. The clinical findings were recorded. Softcopy CT images were reviewed by two experienced abdominal radiologists (KS, DM) for location of lesion, size, shape, presence of central hyperdense focus, degree

Kumaresan Sandrasegaran; Dean D. Maglinte; Arumugam Rajesh; Fatih M. Akisik

2004-01-01

166

CT Appearance of Acute Appendagitis  

Microsoft Academic Search

OBJECTIVE. Our aim was to describe the spectrum of CT findings in patients with acute epiploic appendagitis and also to evaluate the changes seen with this condition. MATERIALS AND METHODS . Fifty patients diagnosed with acute epiploic ap- pendagitis seen on contrast-enhanced CT were included in this study. The CT scans of the epiploic appendagitis were evaluated for the presence

Ajay K. Singh; Debra A. Gervais; Peter F. Hahn; James Rhea; Peter R. Mueller

2004-01-01

167

Hypertrophic Columns of Bertin: Imaging Findings  

PubMed Central

Hypertrophic column of Bertin (HCB) may mimic renal mass and may lead to unnecessary nephrectomy in some conditions. In this case report we present a patient with HCB, which mimics renal mass in ultrasonography (US) examination with its US, Doppler US and magnetic resonance imaging (MRI) findings. In contrast to the US, excretory urography (EU) and computed tomography (CT) findings of HCB, MRI findings of this entity could not take part in the literature sufficiently. We suggest that this case report could be useful in preventing the unnecessary biopsy and surgical procedures. In conclusion, however, US is often sufficient in the diagnosis of HCB, unusual lesions could be seen. In the final diagnosis of these lesions, MRI is very useful and more responsive technique. Understanding the imaging characteristics of HCB could prevent unnecessary interventional or surgical procedures. PMID:25610298

Algin, Oktay; Ozmen, Evrim; Gumus, Mehmet

2014-01-01

168

Unusual presentation of metastatic adenocarcinoma  

PubMed Central

Background The most common tumours of the adrenal gland are adenoma, pheochromocytoma, adrenocortical carcinoma, and metastases. Although the imaging features of these tumours are established, the imaging characteristics of uncommon adrenal masses are less well known. In patients with extradrenal tumour, incidental discovery of an adrenal mass necessitates excluding the possibility of metastatic malignancy. Case presentation A 52 year-old female was diagnosed with oesophageal adenocarcinoma and treated with oesophagectomy and adjuvant chemotherapy. Sixteen months later on staging CT scan a 2 × 2 cm adrenal mass was detected, which increased in size over a period of time to 3 × 3 cm in size. Adrenalectomy was performed and histological examination revealed metastatic adenocarcinoma within an adrenal adenoma. Conclusion The present case highlights the unusual behaviour of an oesophageal adenocarcinoma causing metastasis to an adrenocortical adenoma. PMID:17949483

Bagwan, Izhar N; Cook, Gary; Mudan, Satvinder; Wotherspoon, Andrew

2007-01-01

169

Pulmonary vasculitis: CT features.  

PubMed

The pulmonary vasculitides are a heterogeneous group of inflammatory disorders that may be primarily localized to the pulmonary vasculature or be systemic in nature. The primary pulmonary vasculitides usually affect small vessels, whereas the systemic vasculitides can involve any size pulmonary vessels. For all types of vasculitis, there is a high degree of overlap within groups in regard to their appearance at computed tomography (CT). The most common CT findings are the result of either diffuse or focal pulmonary hemorrhage, are nonspecific, and include ground-glass opacity, consolidation, and small centrilobular nodules. Therefore, the CT findings must be considered in concert with the history, physical examination, and laboratory examination when a specific diagnosis is sought. This review will discuss the typical CT features of both the systemic and the primary pulmonary vasculitides, drawing a distinction where CT is helpful in differentiating among the various causes. PMID:16088562

Ravenel, James G; McAdams, H Page

2003-08-01

170

CT -- Body  

MedlinePLUS

... contrast injection usually lasts only 10 to 30 seconds. top of page • What you'll experience View larger with caption CT scan: appendicitis View larger with caption CT scan: normal appendix CT exams are generally painless, fast and easy. With multidetector CT, the amount of ...

171

Unusual presentations of metastatic prostate carcinoma as detected by anti-1-amino-3-[18F]fluorocyclobutane-1-carboxylic acid (anti-3-[18F] FACBC) PET-CT  

PubMed Central

Prostate carcinoma is the second most common cause of cancer related mortality in males in the United States. The pattern of metastatic disease of prostate cancer is well recognized, frequently involving sclerotic bone lesions and abdomino-pelvic lymph nodes. Anti-1-amino-3-[18F]fluorocyclobutane-1-carboxylic acid (anti-3-[18F] FACBC) is a synthetic amino acid analog positron emission tomography (PET) radiotracer with reported utility in the detection of prostate carcinoma. We present two cases of unusual presentations of prostate carcinoma, one with malignant ascitis and omental implants and the other with lytic bone lesions detected with anti-3-[18F]FACBC. PMID:21825855

Amzat, Rianot; Taleghani, Pooneh; Savir-Baruch, Bital; Nieh, Peter T.; Master, Viraj A.; Halkar, Raghuveer K.; Lewis, Melinda M.; Faurot, Michelle; Bellamy, Leah M.; Goodman, Mark M.; Schuster, David M.

2013-01-01

172

An unusual facial sinus.  

PubMed

An unusual presentation of a chronic suppurative granuloma on the alar base area originating from a maxillary lateral incisor is reported. Treatment involved adequate endodontic therapy with simultaneous apical surgery and excision of the granuloma and sinus tract. Awareness of the possible dental origin of facial sinuses, despite their unusual location, is emphasized. PMID:8639118

Cheung, L K; Samman, N; Lee, E

1996-02-01

173

Some Unusual Matrix Eigenvalue Problems  

E-print Network

. We survey some unusual eigenvalue problems arising in different applications. We show that all these problems can be cast as problems of estimating quadratic forms. Numerical algorithms based on the well-known Gauss-type quadrature rules and Lanczos process are reviewed for computing these quadratic forms. These algorithms reference the matrix in question only through a matrix-vector product operation. Hence it is well suited for large sparse problems. Some selected numerical examples are presented to illustrate the efficiency of such an approach. 1 Introduction Matrix eigenvalue problems play a significant role in many areas of computational science and engineering. It often happens that many eigenvalue problems arising in applications may not appear in a standard form that we usually learn from a textbook and find in software packages for solving eigenvalue problems. In this paper, we described some unusual eigenvalue problems we have encountered. Some of those problems have been ...

Zhaojun Bai And; Zhaojun Bai; Gene H. Golub

1999-01-01

174

True hermaphrodite: very unusual type.  

PubMed

True hermaphrodite is one of the rare gonadal as well as genital abnormality due to a defect in sexual differentiation. Here, we are reporting the most unusual type of true hermaphrodite diagnosed at the age of 25 years during operation for undescended testis, presenting as a case of infertility and failure to ejaculate during sexual intercourse. The patient was found to have grossly as well as histologically proven left ovary, left fallopian tube and uterus as well as a well descended left testis, with totally absent either right fallopian tube and ovary or testis. Thus, this is unusual finding to ratify the occurrence of true hermaphrodite in the absence of ambiguous external genitalia. PMID:16895042

Berhan, Yifru; Lemma, Be-ede; Ergete, Wondwossen; Gemechu, Tufa

2004-07-01

175

The Aa-Pri4 gene, specifically expressed during fruiting initiation in the Agrocybe aegerita complex, contains an unusual CT-rich leader intron within the 5' uncoding region.  

PubMed

The Aa1-Pri4 gene was cloned from the edible mushroom Agrocybe aegerita. The gene, specifically expressed during fruiting initiation, encodes a glycine-rich protein of 116 amino acids, with no homology to already known proteins. Homologous genes were amplified from two other strains belonging to the Agr. aegerita complex and originating from South-East Asia; and a comparison of the three genes revealed a high conservation of the coding sequences (72.8-97.8%). The PRI4 putative protein sequences were highly similar (87.5-100.0%); and all of them contained two protein kinase C sites, suggesting a potential supplementary regulation by phosphorylation at the protein level. The 5' uncoding regions all presented a leader intron, very variable in sequence (45.7% identity), but with a high C+T content (74.5-79.0%). The presence of such CT-rich sequences previously described in the promoter of highly expressed fungal genes suggests that the leader intron of the Aa1-Pri4 gene could be involved in the high-level, stage-specific expression. PMID:13680153

Sirand-Pugnet, Pascal; Santos, Cruz; Labarère, Jacques

2003-11-01

176

An Unusual Lunar Halo  

ERIC Educational Resources Information Center

Discusses a photograph of an unusual combination of lunar halos: the 22-degree refraction halo, the circumscribed halo, and a reflection halo. Deduces the form and orientations of the ice crystals responsible for the observed halo features. (MLH)

Cardon, Bartley L.

1977-01-01

177

Acute chest pain in emergency room. Preliminary findings with 40-64-slice CT ECG-gated of the whole chest.  

PubMed

ECG-gated MDCT of the entire chest represents the latest technical advance in the diagnostic work-up of atypical chest pain. The authors report their preliminary experience with the use of 40 and 64-slice CT in the emergency room and recommend to study only patients with moderate likelihood of coronary artery disease. ECG-gated MDCT of the entire chest will be preferentially performed on 64-slice MDCT rather than 40-slice MDCT because it enable to reduce the scan time (18 seconds versus 28 seconds acquisition time), the volume of contrast medium (82 mL + 15 mL versus 97 mL + 15 mL of highly concentrated contrast agent for a patient of 70 kgs) and radiation exposure (17 mSv versus 19 mSv). Approximately 1500 to 2000 of images are produced and need to be analysed on a dedicated workstation by a radiologist expert in cardiac and thoracic disorders. At the present time, only a few studies exist in the literature showing some promising results but further large clinical studies are needed before to implement such sophisticated protocol in emergency room. PMID:17555066

Coche, E

2007-01-01

178

3D computed tomography of an unusual triple ended xiphoid process.  

PubMed

The sternum is the site of frequent variations and anomalies. Knowledge of the plain film and CT appearance of these variations and anomalies is useful in differentiating from pathologic conditions and in surgical planning. We present a rare case of an unusual triple ended xiphoid process with its plain film and 3D CT volume rendered reconstructed imaging. PMID:22708239

Mosca, Heather; Dross, Peter

2012-03-01

179

An unusual case of perinatal tuberous sclerosis.  

PubMed

We report a case of a neonate who presented to us with multiple rhabdomyomas of heart, cortical tubers in the brain and skeletal anomalies such as Pierre Robin sequence, bilateral clubfoot and lower small bowel obstruction. Though a diagnosis of neonatal tuberous sclerosis was made, the association of skeletal anomalies and intestinal obstruction was a rare and unusual finding. PMID:25024981

Hegde, Deeparaj Ganapati; Mondkar, Jayashree; Panchal, Harshad

2014-04-01

180

Identifying Unusual Galaxies  

NSDL National Science Digital Library

In this activity, students match unusual galaxies with their distinctive names and justify their reasoning. Students discover that often, galaxies acquire their names based upon how they appear to observers. This activity includes a student worksheet and background information for the teacher. This is activity four in "The Hidden Lives of Galaxies" information and activity booklet.

181

Unusual DNA structures  

SciTech Connect

The contents of this book are: Unusual DNS Structures and the Probes Used for Their Detection; The Specificity of Single Strand Specific Endonucleases; Chromatin STructure and DNA Structure at the hsp 26 Locus of Drosophilia; Cruciform Extrusion in Supercoiled DNA-Mechanisms and Contextual Influence; Torsional Stress, Unusual DNA Structures, and Eukaryotic Gene Expression; DNA Sequence and Structure: Bending to Biology. Cruciform Transitions Assayed Using a Psoralen Cross-linking Method: Applications to Measurements of DNA Torisonal Tension; NMR-Distance Geometry Studies of Helical Errors and Sequence Dependent Conformations of DNA in Solution; Hyperreactivity of the B-Z Junctions Probed by Two Aromatic Chemical Carcinogens; Inherently Curved DNA and Its Structural Elements; and DNA Flexibility Under Control: The Juma Algorithm and its Application to BZ Junctions.

Wells, R.D.; Harvey, S.C.

1988-01-01

182

FDG PET/CT in follicular dendritic cell sarcoma with extensive peritoneal involvement.  

PubMed

Follicular dendritic cell sarcoma (FDCS) is a rare neoplasm that originates from follicular dendritic cells. A 33-year-old woman was referred because of a 2-month history of lower abdominal fullness. Enhanced T1-weighted MR images showed enhancement of the thickened pelvic peritoneum. FDG PET/CT was performed showing multiple FDG-avid lymph nodes in the parapharyngeal, bilateral supraclavicular, left axillary, mediastinal, and abdominal regions, and intense FDG uptake in the thickened mesentery and peritoneum. Pathologic findings of both the left supraclavicular lymph node and peritoneal biopsy specimens were consistent with high-grade FDCS. In this case, extensive peritoneal involvement by FDCS was unusual. PMID:24476636

Dong, Aisheng; Wang, Yang; Zuo, Changjing

2014-06-01

183

Unusual causes of pneumothorax.  

PubMed

Pneumothorax is divided to primary and secondary. It is a situation that requires immediate treatment, otherwise it could have severe health consequences. Pneumothorax can be treated either by thoracic surgeons, or pulmonary physicians. In our current work, we will focus on unusual cases of pneumothorax. We will provide the etiology and treatment for each case, also a discussion will be made for each situation. PMID:25337394

Ouellette, Daniel R; Parrish, Scott; Browning, Robert F; Turner, J Francis; Zarogoulidis, Konstantinos; Kougioumtzi, Ioanna; Dryllis, Georgios; Kioumis, Ioannis; Pitsiou, Georgia; Machairiotis, Nikolaos; Katsikogiannis, Nikolaos; Tsiouda, Theodora; Madesis, Athanasios; Karaiskos, Theodoros; Zarogoulidis, Paul

2014-10-01

184

Unusual causes of pneumothorax  

PubMed Central

Pneumothorax is divided to primary and secondary. It is a situation that requires immediate treatment, otherwise it could have severe health consequences. Pneumothorax can be treated either by thoracic surgeons, or pulmonary physicians. In our current work, we will focus on unusual cases of pneumothorax. We will provide the etiology and treatment for each case, also a discussion will be made for each situation. PMID:25337394

Ouellette, Daniel R.; Parrish, Scott; Browning, Robert F.; Turner, J. Francis; Zarogoulidis, Konstantinos; Kougioumtzi, Ioanna; Dryllis, Georgios; Kioumis, Ioannis; Pitsiou, Georgia; Machairiotis, Nikolaos; Katsikogiannis, Nikolaos; Tsiouda, Theodora; Madesis, Athanasios; Karaiskos, Theodoros

2014-01-01

185

[An unusual leading symptom].  

PubMed

We report the case of a 81-year-old male with a long standing history of progressive dyspnea and depression. In spite of extensive cardiological, pneumological and neurological investigations the reason for his complaints remained unclear. Known for a parasellar meningioma MRI scans were repeated, but were shown to be stable. Finally endocrine investigations revealed the presence of a panhypopituitarism explaining the unusual clinical picture. PMID:25097165

von Felten, Claudia; Eberhard, Stephan

2014-08-01

186

[Unusual antenatal gestational choriocarcinoma].  

PubMed

Choriocarcinoma is a rare and aggressive tumor that occurs mainly after a molar pregnancy, and exceptionally during a diploid viable pregnancy. We report a case of a 30 years old primipare that revealed a choriocarcinoma at 37 weeks by a generalized seizure. This unusual event did not, however, delay the early introduction of chemotherapy even in the absence of histological diagnosis. This diagnosis must be evoked in woman with genital activity presenting an unknown tumor. Treatment can be started without waiting for the histological evidence, due to the important feature of the hCG assay, significantly improving the prognosis. PMID:25242439

Tardif, C; Nowak, C; Sagan, C; Frenel, J-S; Philippe, H-J

2014-10-01

187

Leukostasis in an Adult with AML Presenting as Multiple High Attenuation Brain Masses on CT  

PubMed Central

Acute myeloid leukemia (AML) is a hematologic malignancy that can present with central nervous system (CNS) symptoms. Neurological symptoms may result from the local accumulation of malignant cells in or near the brain (chloroma), infection, hemorrhage, or infarcts from leukostasis. Leukostasisis a syndrome that can include brain infarction due hyperviscosity of blood with vascular occlusion but CNS involvement is rarely encountered in adults. We report an unusual case of leukostasis in an adult who presented with multiple high attenuation intracranial masses on CT. While initially thought to represent chloromasthey proved to be hemorrhagic infarcts secondary toleukostasis on open brain biopsy. This condition is under-reported in the radiology literature and only rarely biopsy proven. We review in this paper the pathological, CT and MRI findings of leukostasis in order to increase awareness of this uncommon entity and facilitate diagnosis. PMID:24551717

Algharras, Abdulaziz Ahmad; Mamourian, Alexander; Coyne, Thomas; Mohan, Suyash

2013-01-01

188

Extracolonic Findings on Computed Tomography (CT) Colonography  

ClinicalTrials.gov

Solitary Pulmonary Nodules; Multiple Pulmonary Nodules; Renal Neoplasms; Adrenal Gland Neoplasms; Aortic Aneurysm, Abdominal; Liver Neoplasms; Adnexal and Skin Appendage Neoplasms; Lymphadenopathy; Pancreatic Neoplasms

2013-01-25

189

(131)I SPECT/CT demonstrated ovarian endometrioma.  

PubMed

A 44-year-old woman had a history of papillary thyroid carcinoma and underwent total thyroidectomy and I ablation therapy. During the follow-up, 2-mCi I cancer workup showed an unusual shape of uptake in the pelvic region. Hybrid SPECT/CT revealed uptake posterior to the uterus, where sonography showed an 85.4-mm right ovarian endometrioma just corresponding to the location. Laparoscopic salpingo-oophorectomy showed right ovarian endometrioma (7 cm) and left ovarian cyst (4 cm). Pathologic findings showed bilateral endometriosis. After that survey, follow-up I cancer workup showed left supraclavicular, pretracheal, and right hilar metastatic lymphadenopathy with pulmonary metastasis, but no pelvic uptake was noted. PMID:24300362

Chuang, Tzyy-Ling; Hsu, Chun-Shuo; Wang, Yuh-Feng

2014-02-01

190

MRI, Enhanced CT, and FDG PET/CT in Primary Retroperitoneal Mucinous Cystadenocarcinoma.  

PubMed

Primary retroperitoneal mucinous cystadenocarcinoma (PRMC) is an extremely rare neoplasm. We present a case of PRMC with MRI, enhanced CT, and FDG PET/CT findings. Abdominal MRI showed a cystic lesion in the retroperitoneum with a mural nodule. The mural nodule showed progressive enhancement on enhanced CT and intense FDG uptake on early PET/CT with increased SUVmax on delayed PET/CT. Laparoscopy was performed. Retroperitoneal mucinous cystadenocarcinoma was confirmed histopathologically. Metastasis from gastrointestinal tract or ovary was excluded. This case indicates, although rare, PRMC should be considered when a hypermetabolic retroperitoneal cystic lesion with bilateral normal ovaries is found on FDG PET/CT. PMID:24445275

Dong, Aisheng; Zhai, Zhijun; Wang, Yang; Zuo, Changjing

2015-01-01

191

Acute eosinophilic ascites: An unusual form of an unusual case.  

PubMed

Eosinophilic gastroenteritis (EGE) is an uncommon disease characterised by eosinophilic infiltration in the gastrointestinal tract. EGE may involve more than one layer of the gastrointestinal tract. Clinical features depend on the layer and location which is involved. We report an unusual case of eosinophilic ascites associated with antinuclear antibody positivity, which is an unusual variety of serosal form of EGE. PMID:25315240

Kodan, Parul; Shetty, Meenakshi A; Pavan, Mr; Kariappa, Ahalya; Mahabala, Chakrapani

2015-01-01

192

Some Unusual Pathways  

NSDL National Science Digital Library

Photos and images taken from the space shuttle are used to show unusual paths, such as those created by smoke, camel tracks, lava flows, and river deltas. After observing and discussing the images, students will record their observations, and draw conclusions about the origin and nature of the paths. Additionally, students are introduced to one-way (rivers, jet stream) and two-way (roads, bird flyways) paths. The URL opens to the investigation directory, with links to teacher and student materials, lesson extensions, resources, teaching tips, and assessment strategies. This is Investigation 3 of four found in the Grades K-4 Module 4 of Mission Geography. The Mission Geography curriculum integrates data and images from NASA missions with the National Geography Standards. Each of the four investigations in Module 4, while related, can be done independently. Please see Investigation 1 of this module for a two-page module overview and list of all standards addressed.

193

Computed tomography findings of a solitary extramedullary plasmacytoma of the spleen: A case report and literature review  

PubMed Central

Solitary extramedullary plasmacytoma (EMP) of the spleen is a rare condition. The present study describes the case of a 23-year-old female with an extremely rare solitary EMP of the spleen. Upon examination, the tumor demonstrated unusual and notable multiple-phase spiral computed tomography (CT) findings. The lesion was a solitary, well-defined mass, with areas of variable splenic necrosis and cystic degeneration. Contrast-enhanced CT revealed progressive enhancement of the lesion in the cystic wall, internal septa and solid portion, a finding that has not previously been described. The patient underwent a splenectomy and recovered without complications. No evidence of tumor recurrence has occurred during the past two years of follow-up. To the best of our knowledge, this is the first study to examine the CT findings of a solitary EMP of the spleen. The study aimed to investigate the imaging features of solitary EMP, in particular the multiple-phase spiral CT findings, and raise awareness of the disease to reduce misdiagnoses. PMID:25435962

WANG, YING; YANG, LI; QIAN, ZI-HUA; ZHU, XIU-LIANG; YU, RI-SHENG

2015-01-01

194

Unusual Presentation of a Metastatic Esophageal Carcinoma  

PubMed Central

Esophageal cancer most commonly presents with upper digestive symptoms such as dysphagia. Lymph nodes are among the most common metastatic sites of this type of cancer. We report the case of a 53-year-old man presenting with unusual sole presenting features of esophageal cancer. The patient sought medical attention for abdominal pain without dysphagia, which was first investigated with an abdominal computed tomography scan. A large abdominal mass was discovered on imaging. Biopsies of this mass were in keeping with esophageal squamous cell cancer. With this finding, gastroscopy was performed, confirming the presence of primary esophageal cancer. This is a rare presentation of esophageal cancer without upper gastrointestinal symptoms. This case reinforces the value of biopsy for any neoplastic mass, especially in a context of unusual symptoms. PMID:22679417

Orlicka, Katarzyna; Maynard, Stéphanie; Bouin, Mickael

2012-01-01

195

Atypical distribution of small nodules on high resolution CT studies: patterns and differentials.  

PubMed

Accurate diagnosis of lung disease with high resolution CT is challenging and relies on a pattern-based approach coupled with knowledge of the distribution of the abnormalities in the lung parenchyma. Some findings and distributions of small nodules are specific for certain diseases, but atypical patterns have been described, especially for granulomatous diseases such as sarcoidosis and tuberculosis. Unusual HRCT aspects that involve the coalescence of small nodules have been termed the "sarcoid galaxy sign" and the "sarcoid cluster sign". Other imaging findings such as the "reversed halo sign" and the "fairy ring sign" can also be composed of small nodules. The aim of this review was to describe and illustrate a range of conditions that manifest with atypical distribution of small nodules on HRCT. We discuss the various aspects, associated findings, and differential diagnosis particularly in sarcoidosis and tuberculosis. PMID:21377343

Marchiori, Edson; Zanetti, Gláucia; Barreto, Miriam Menna; de Andrade, Flávio Teixeira Azeredo; Rodrigues, Rosana Souza

2011-09-01

196

Kaposi sarcoma in unusual locations  

PubMed Central

Kaposi sarcoma (KS) is a multifocal, vascular lesion of low-grade malignant potential that presents most frequently in mucocutaneous sites. KS also commonly involves lymph nodes and visceral organs. This article deals with the manifestation of KS in unusual anatomic regions. Unusual locations of KS involvement include the musculoskeletal system, central and peripheral nervous system, larynx, eye, major salivary glands, endocrine organs, heart, thoracic duct, urinary system and breast. The development of KS within wounds and blood clots is also presented. KS in these atypical sites may prove difficult to diagnose, resulting in patient mismanagement. Theories to explain the rarity and development of KS in these unusual sites are discussed. PMID:18605999

Pantanowitz, Liron; Dezube, Bruce J

2008-01-01

197

Experiments with Unusual Oxidation States  

ERIC Educational Resources Information Center

Describes four synthesis experiments, adapted for the general chemistry laboratory, in which compounds in unusual oxidation are prepared. The abnormal oxidation states involved in the synthesis products are: silver (II), chromium (II), lead (IV), and bromine (I). (MLH)

Kauffman, G. B.

1975-01-01

198

Two unusual, radially pulsating stars  

NASA Astrophysics Data System (ADS)

We present the results of pulsation modelling of two unusual radially pulsating stars pds and bep. The former variable is the first BL Her-type star showing the period doubling effect. The second variable is a member of well-detached eclipsing binary system and the first member of a new class of variable stars that mimic RR Lyrae pulsation, but have unusually small masses.

Smolec, Rados?aw

2014-12-01

199

Primary epiploic appendagitis: MRI findings  

Microsoft Academic Search

Primary epiploic appendagitis (PEA) occurs secondary to inflammation of an epiploic appendage, and is considered to be a rare cause of acute abdomen. In this case report, we describe the magnetic resonance imaging (MRI) findings of PEA correlated with computed tomographic (CT) findings. MRI findings included an oval shaped fat intensity mass with a central dot on T1- and T2-weighted

Mustafa ?irvanci; N. Cem Balci; Kutlay Karaman; Cihan Duran; Ercan Karaka?

2002-01-01

200

An unusual presentation of diabetic amyotrophy: myoclonus  

PubMed Central

Diabetic amyotrophy is a distinctive form of diabetic neuropathy. It is characterised by a weakness and wasting of proximal muscles of the lower limbs with associated pain. We report a case of an elderly patient with unusual presentation of diabetic amyotrophy. He presented with myoclonic jerks and recurrent falls. Examination findings and electrophysiological studies were consistent with a diagnosis of diabetic amyotrophy. He responded well to steroids with marked improvement in strength of the lower limb muscles and complete resolution of myoclonic jerks. Diabetic amyotrophy presenting as myoclonic jerks has been rarely reported before. PMID:23386493

Zaidi, Syed Amir; Chhetri, Suresh Kumar; Lekwuwa, Godwin; Majeed, Tahir

2013-01-01

201

Adenoid cystic carcinoma: An unusual presentation  

PubMed Central

The adenoid cystic carcinoma is a relatively rare epithelial tumor of the major and minor salivary glands, accounting for about 1% of all malignant tumor of the oral and maxillofacial regions. Peak incidence occurs between the 5th and 6th decades of life. The clinical and pathological findings typical of this tumor include slow growth, peri-neural invasion, multiple local recurrences and distant metastasis. Herein, we report a case of adenoid cystic carcinoma of oropharynx with unusual clinical presentation. The diagnosis of this case and importance of cytology in diagnosing such cases is discussed. PMID:25328314

Pushpanjali, M; Sujata, D Naga; Subramanyam, S Bala; Jyothsna, M

2014-01-01

202

Unusual presentation of osteopoikilosis.  

PubMed

We present a case of osteopoikilosis in a 74-year-old woman with hip pain, presenting multiple osteoblastic lesions of the axial skeleton including an osteoblastic large lesion of her left femur. The imaging findings on X-rays and computed tomography are provided along with the discussion of the differential diagnosis on the basis of the recent literature. PMID:24617187

Simoni, P; Denut, J; Ben Mustapha, S; Bianchi, E; Mutijima, E; Alvarez-Miezentseva, V; Malaise, O

2013-01-01

203

CT enterography with polyethylene glycol solution vs CT enteroclysis in small bowel disease  

PubMed Central

Objective The aim of the study is to compare CT enterography with polyethylene glycol solution (PEG-CT) with CT enteroclysis (CT-E) in patients with suspected small bowel disease. Methods 145 patients underwent abdominal contrast-enhanced 16-row multidetector CT after administration of 2000 ml of PEG by mouth (n = 75) or after administration of 2000 ml of methylcellulose by nasojejunal tube (n = 70). Small bowel distension, luminal and extraluminal findings were evaluated and compared with small bowel follow-through examination in 60 patients, double contrast enema in 50, surgery in 25 and endoscopy in 35. Statistical evaluation was carried out by ?2 testing. For both techniques we have also calculated the effective dose and the equivalent dose in a standard patient. Results Crohn's disease was diagnosed in 64 patients, neoplasms in 16, adhesions in 6. Distension of the jejunum was better with CT-E than PEG-CT (p<0.05: statistically significant difference). No significant difference was present for others sites (p>0.05). Evaluation of pathological ileal loops was good with both techniques. The values of sensitivity, specificity and diagnostic accuracy were respectively 94%, 100% and 96% with CT-E, and 93%, 94% and 93% with PEG-CT. The effective dose for PEG-CT was less than the dose for the CT-E (34.7 mSv vs 39.91 mSv). Conclusion PEG-CT shows findings of Crohn's disease as well as CT-E does, although CT-E gives better bowel distension, especially in the jejunum, and has higher specificity than PEG-CT. PMID:20959377

Minordi, L M; Vecchioli, A; Mirk, P; Bonomo, L

2011-01-01

204

An Unusual Exponential Graph  

ERIC Educational Resources Information Center

This paper is an addition to the series of papers on the exponential function begun by Albert Bartlett. In particular, we ask how the graph of the exponential function y = e[superscript -t/t] would appear if y were plotted versus ln t rather than the normal practice of plotting ln y versus t. In answering this question, we find a new way to…

Syed, M. Qasim; Lovatt, Ian

2014-01-01

205

Multiphase multidetector CT in the diagnosis of haemobilia: a potentially catastrophic ruptured hepatic artery aneurysm complicating the treatment of a patient with locally advanced rectal cancer  

PubMed Central

Acute haemobilia is an unusual and potentially catastrophic cause of gastrointestinal bleeding. We describe such a case presenting as a rare complication of a hepatic artery aneurysm following the development and successful treatment of subacute bacterial endocarditis during a radical downstaging chemoradiotherapy regime for locally advanced rectal cancer. We suggest that multiphase multidetector-row CT can have an important role in the diagnosis of acute haemobilia and discuss imaging findings associated with the condition. This case raises awareness of benign conditions mimicking malignancy in oncological patients and reinforces the importance of reviewing historical imaging. PMID:21511745

Mortimer, A M; Wallis, A; Planner, A

2011-01-01

206

Primary epiploic appendagitis: CT manifestations  

Microsoft Academic Search

Inflammation of an epiploic appendage is considered to be a rare cause of acute abdomen. Recently, it has been reported that typical computed tomography (CT) findings of primary epiploic appendagitis (PEA) provide a definitive diagnosis in most of the cases. However, since these papers are only few, they are easily overlooked by the practicing radiologists. Our purpose is to add

Mustafa ?irvanci; Mehmet H Tekelio?lu; Cihan Duran; Hakan Yardimci; Levent Onat; Kadir Özer

2000-01-01

207

Bilateral renal artery dissections: unusual complication of polyarteritis nodosa.  

PubMed

A case of polyarteritis nodosa with the acute complications of multiple bilateral real artery dissection, perirenal haemorrhage and kidney infarction is described. The diagnosis of polyarteritis nodosa was established on the basis of angiographical and clinical findings. Follow-up arteriograms and CT-findings after prednisone therapy are discussed. PMID:6144545

Hekali, P E; Pajari, R I; Kivisaari, M L; Haapanen, E J; Leirisalo, M

1984-02-01

208

Plummer Vinson syndrome: unusual features.  

PubMed

Plummer Vinson syndrome is a constellation of postcricoid esophageal webs, iron deficiency anemia, dysphagia and koilonychia. We describe some unusual manifestations in three patients with this syndrome; these were clubbing instead of koilonychia, tortuous esophagus in addition to presence of esophageal webs, and celiac disease. PMID:11990331

Makharia, Govind K; Nandi, Bhaskar; Garg, Pramod K; Tandon, Rakesh K

2002-01-01

209

An unusual cause of syncope  

Microsoft Academic Search

We present an unusual cause for syncope that was initially thought to be due to drug therapy. Further investigations revealed the cause to be secondary to hypoadrenalism from a primary breast tumour. This case highlights the importance of arriving at the right diagnosis as signs and symptoms of adrenal insufficiency can mimic other conditions. Appropriate treatment also improves quality of

Lin H. Yeo; Rachel Pyburn; Thirumalesha Desa Venkatanarayana

2006-01-01

210

Hypertrophic osteoarthropathy: two unusual causes.  

PubMed Central

Two patients with hypertrophic osteoarthropathy of unusual aetiology are described. The first patient developed the condition in association with oesophageal carcinoma and the second as a complication of active pulmonary tuberculosis. In the second case, substantial resorption of new bone was seen following treatment. Images Fig. 1 PMID:6866884

Barber, P. V.; Lechler, R.

1983-01-01

211

Evolution of IPv6 Internet topology with unusual sudden changes  

NASA Astrophysics Data System (ADS)

The evolution of Internet topology is not always smooth but sometimes with unusual sudden changes. Consequently, identifying patterns of unusual topology evolution is critical for Internet topology modeling and simulation. We analyze IPv6 Internet topology evolution in IP-level graph to demonstrate how it changes in uncommon ways to restructure the Internet. After evaluating the changes of average degree, average path length, and some other metrics over time, we find that in the case of a large-scale growing the Internet becomes more robust; whereas in a top—bottom connection enhancement the Internet maintains its efficiency with links largely decreased.

Ai, Jun; Zhao, Hai; Kathleen, M. Carley; Su, Zhan; Li, Hui

2013-07-01

212

Brown tumor as an unusual but preventable cause of spinal cord compression: Case report and review of the literature  

PubMed Central

Brown tumor (BT), also known as osteoclastoma, may appear in the context of primary and secondary hyperparathyroidism. Spinal cord compression due to the BT is extremely rare. We present here an unusual case of BT involving thoracal spine and mandible. A 26-year-old woman, who had been on hemodialysis for chronic renal failure for over 6 years, got admitted with dorsal pain and progressive weakness in her lower extremities and gait disturbances. Neurological examination revealed spastic paraparesis and symmetrically hyperactive tendon reflex in the lower extremities. She had hypoesthesia under T10 level. On physical examination, a swelling on the left side of her jaw was also detected. Magnetic resonance imaging (MRI) showed cord compression due to an extradural mass lesion at T8 level. A computerized tomography (CT) scan showed that this expansile lytic lesion was caused by the collapse of vertebra corpus (T8) at that level. CT of the mandible revealed an expansile lytic lesion on left arm of the mandible. Laboratory findings were nearly normal except parathormone level elevation to 1289 pg/mL (normal 30-70 pg/mL). Ultrasound examination showed enlargement of the parathyroid glands. The patient underwent an emergency decompression and stabilization surgery. The lesion was fragile and reddish in appearance and was easy to aspirate. The tumor was reported as “BT.” Her weakness in the lower extremities improved in the early postoperative period. Following surgical intervention, the patient was transferred to nephrology clinic for additional medical treatment. PMID:24891890

Tayfun, Hakan; Metin, Orakdö?en; Hakan, Somay; Zafer, Berkman; Vardar, Aker Fügen

2014-01-01

213

Unidentified phenomena - Unusual plasma behavior?  

NASA Astrophysics Data System (ADS)

The paper describes observations of a phenomenon belonging to the UFO category and the possible causes of these events. Special attention is given to an event which occurred during the night of September 19-20, 1974, when a huge 'star' was observed over Pertrozavodsk (Russia), consisting of a bright-white luminous center, emitting beams of light, and a less bright light-blue shell. The star gradually formed a cometlike object with a tail consisting of beams of light and started to descend. It is suggested that this event was related to cosmic disturbances caused by an occurrence of unusually strong solar flares. Other examples are presented that relate unusual phenomena observed in space to the occurrence of strong magnetic turbulence events.

Avakian, S. V.; Kovalenok, V. V.

1992-06-01

214

Aggressive angiomyxoma: an unusual presentation.  

PubMed

Aggressive angiomyxoma is an uncommon mesenchymal myxoid tumor that is characterized by slow growth and frequent local recurrence. It is currently regarded as a nonmetastasizing tumor. We describe a case of recurrent aggressive angiomyxoma with invasion into the veins including the inferior vena cava and the right atrium and with pulmonary metastases. Our case, together with those unusual cases documented in previous reports, may lead to a reappraisal of the nature of aggressive angiomyxoma. PMID:22247641

Geng, Junzu; Cao, Bofeng; Wang, Liping

2012-01-01

215

Unusual Presentation of Cutaneous Leiomyoma  

PubMed Central

Herein, we report a case of leiomyoma cutis because of its rarity and unusual presentation. The case presented with a solitary leiomyoma lesion which was painless. However, the adjacent normal appearing area was tender. A biopsy of the lesion as well as of a portion of the adjacent normal appearing area was taken, which confirmed the diagnosis of cutaneous leiomyoma. This may suggest the dormant nature of the disease which has not yet become apparent. PMID:25484434

Bhaskar, Sapnashree; Jaiswal, Ashok K; Madhu, SM; Santosh, KV

2014-01-01

216

Star Library: An Unusual Episode  

NSDL National Science Digital Library

Created by Mary Richardson of Grand Valley State University, this article describes an activity that illustrates contingency table (two-way table) analysis. Students use contingency tables to analyze the "Â?Â?unusual episode" (the sinking of the ocean liner Titanic) data (from Dawson, 1995) and attempt to use their analysis to deduce the origin of the data. The activity is appropriate for use in an introductory college statistics course or in a high school AP statistics course.

Richardson, Mary

2003-03-17

217

Syringocystadenoma Papilliferum: An Unusual Presentation  

PubMed Central

Syringocystadenoma papilliferum is a benign hamartomatous adnexal tumour. Most of the patients present with solitary lesions in the head and neck region at birth or in early childhood. Multiple lesions are rarely seen and those which arise outside the head and neck region are even more uncommon. A case of syringocystadenoma papilliferum with multiple verrucous lesions and which was located in the right flank, an unusual site, has been presented. PMID:24995228

Kumar, Parbodh; Varshney, Rahul

2014-01-01

218

Preoperative evaluation of colorectal cancer using CT colonography, MRI, and PET/CT.  

PubMed

Imaging studies are a major component in the evaluation of patients for the screening, staging and surveillance of colorectal cancer. This review presents commonly encountered findings in the diagnosis and staging of patients with colorectal cancer using computed tomography (CT) colonography, magnetic resonance imaging (MRI), and positron emission tomography (PET)/CT colonography. CT colonography provides important information for the preoperative assessment of T staging. Wall deformities are associated with muscular or subserosal invasion. Lymph node metastases from colorectal cancer often present with calcifications. CT is superior to detect calcified metastases. Three-dimensional CT to image the vascular anatomy facilitates laparoscopic surgery. T staging of rectal cancer by MRI is an established modality because MRI can diagnose rectal wall laminar structure. N staging in patients with colorectal cancer is still challenging using any imaging modality. MRI is more accurate than CT for the evaluation of liver metastases. PET/CT colonography is valuable in the evaluation of extra-colonic and hepatic disease. PET/CT colonography is useful for obstructing colorectal cancers that cannot be traversed colonoscopically. PET/CT colonography is able to localize synchronous colon cancers proximal to the obstruction precisely. However, there is no definite evidence to support the routine clinical use of PET/CT colonography. PMID:25493009

Kijima, Shigeyoshi; Sasaki, Takahiro; Nagata, Koichi; Utano, Kenichi; Lefor, Alan T; Sugimoto, Hideharu

2014-12-01

219

NETL CT Imaging Facility  

ScienceCinema

NETL's CT Scanner laboratory is equipped with three CT scanners and a mobile core logging unit that work together to provide characteristic geologic and geophysical information at different scales, non-destructively.

None

2014-05-21

220

NETL CT Imaging Facility  

SciTech Connect

NETL's CT Scanner laboratory is equipped with three CT scanners and a mobile core logging unit that work together to provide characteristic geologic and geophysical information at different scales, non-destructively.

None

2013-09-04

221

Micro-CT  

Microsoft Academic Search

Tomographic imaging started with clinical X-ray computed tomography (CT) in 1972 (Hounsfield 1973). Since then, CT technology\\u000a has rapidly advanced and clinical CT became radiology’s powerhouse. In addition to clinical CT imaging, there is increasing\\u000a need for preclinical exams such as scans of tissue samples, organs or whole animals (in vitro or in vivo) that are used as\\u000a models to

Marc Kachelrieß

222

Falx Cerebri Ossification: CT and MRI Evaluation.  

PubMed

During the last three years, CT and MRI brain scans of 40 patients revealed falx cerebri partial ossification as an incidental finding. The patients had been admitted for brain CT and MRI for several reasons. In most cases, there was no problem in the differential diagnosis of falx cerebri ossification during interpretation of the cases. In a few cases, the lesion should be distinguished from calcified meningioma, small hematoma in the interhemispheric fissure and in one case there was also meningeal infiltration of breast cancer. In these cases both CT and MRI scans of the brain were evaluated and a definite diagnosis was made. PMID:24351265

Tsitouridis, I; Natsis, K; Goutsaridou, F; Tsitouridis, K; Tarazi, L; Chondromatidou, S; Papapostolou, P; Papastergiou, C; Emmanouilidou, M

2006-11-30

223

Reliable predictions of unusual molecules.  

PubMed

Quantum chemistry can today be employed to invent new molecules and investigate their properties and chemical bonding. However, the predicted species must be viable in order to be synthesized by experimentalists. In this perspective article we describe the technology of reliable theoretical predictions and show how understanding of chemical bonding in studied chemical systems could help to design new molecular structures. We also provide a short overview of successfully predicted and already produced (in some cases) planar hypercoordinate species to demonstrate that the consistent theoretical prediction of viable molecules with unusual structures and properties is now a reliable tool for exploring new, yet unknown molecules, clusters, nanomaterials and solids. PMID:23103915

Ivanov, Alexander S; Boldyrev, Alexander I

2012-12-14

224

[Unusual presentation of Wegener's granulomatosis].  

PubMed

We report an unusual case of Wegener's granulomatosis revealed by spleen infarction and complicated by reno-vascular hypertension. A 33-year-old man with a history of spleen infraction and cerebral venous thrombosis was admitted for malignant hypertension, renal failure and nephritic syndrome. On Doppler renal ultrasonography, ostial stenosis of the right renal artery was evidenced. Right kidney was non functional on scintigraphy and the patient underwent a right nephrectomy. Granulomatous vasculitis of the right renal artery was found but anti-neutrophilic cytoplasmic antibodies were absent. The diagnosis of Wegener's granulomatosis was suspected. The patient was treated with cyclophosphamide, corticosteroids and plasma exchanges, and renal function markedly improved. PMID:20605284

Jamoussi, S Ketari; Ben Dhaou, B; Boussema, F; Turki, E; Kochbati, S; Cherif, O; Maamar, M; Rokbani, L

2010-08-01

225

Scrub typhus with unusual presentation.  

PubMed

Scrub typhus is an acute, febrile zoonosis caused by an obligate intracellular bacterium Orientia tsutsugamushi. The clinical manifestations of the disease range from subclinical to fatal organ failure. The common symptoms are fever, chills, headache, myalgia, dry cough, lymphadenopathy, and gastrointestinal disturbances. The presentation with complications is usually due to delay in diagnosis and treatment. We report three cases of scrub typhus that presented with features of meningo-encephalitis, which is very unusual, and all patients recovered with empirical doxycycline treatment. PMID:25489455

Kumar, A S Praveen; Anupama, M P

2014-08-01

226

77 FR 76491 - Findings of Research Misconduct  

Federal Register 2010, 2011, 2012, 2013, 2014

...redone. Specifically, ORI finds that Respondent: Falsified Powerpoint slides and spreadsheets for histomorphometric and microCT results by using the values of HS1 knockout (KO) mice and their controls to represent the CathepsinK cre- Cortactin KO...

2012-12-28

227

A prospective comparison study of double contrast computed tomography (CT) arthrography and arthroscopy of the shoulder  

Microsoft Academic Search

Thirty consecutive patients who underwent double con trast CT arthrography prior to shoulder arthroscopy were prospectively studied. Results from both studies were recorded with the radiologist blinded to the ar throscopic findings when making the final CT reading. The sensitivity, specificity, and accuracy, respectively, of CT arthrography findings compared to arthroscopy were 50%, 100%, 96% for rotator cuff; 66%, 100%

John J. Callaghan; Lawrence M. McNiesh; James P. Dehaven; Carlton G. Savory; David W. Polly

1988-01-01

228

[Unusual presentation of plasma cell myeloma].  

PubMed

A 41 year-old woman consulted because of facial pain. A magnetic resonance imaging showed a mass in the right petrous apex. A biopsy revealed a diffuse proliferation of large atypical cells with plasmablastic appearance, positive for CD138, BCL6, CD56 and p53. The proliferation factor was 80%. Monoclonal kappa light chain expression was observed. Because the unusual clinicopathological features the patient was studied to rule out systemic plasma cell myeloma. Bone scan disclosed multiple cranium osteolytic lesions; proteinogram showed hypogammaglobulinemia and immunofixation in serum and urine were negative. Afterwards, bone marrow biopsy was performed and it presented a 30% infiltration of the bone cylinder by mature plasma cells. These were monoclonal for kappa light chain with focal expression of p53 and without expression of CD56. These findings suggested the diagnosis of multiple myeloma. This case proposes a morphological spectrum of plasma cell neoplasms, showing a continuous clonal evolution of tumor cells, with an acquired plasticity of dedifferentiate, become immature and infiltrate extramedullary tissues, a fact possibly determined by accumulation of multiple genetic alterations. These findings confirm the difficulty of the differential diagnosis from histopathology study between plasmablastic lymphoma and plasmablastic transformation of plasma cell myeloma because of the nearly identical immunohistochemical profiles. PMID:22763165

Bürgesser, María Virginia; Basquiera, Ana Lisa; Diller, Ana

2012-01-01

229

Multiple osteosclerotic lesions in an Iron Age skull from Switzerland (320-250 BC)--an unusual case.  

PubMed

The single Hochdorf burial was found in 1887 during construction work in the Canton of Lucerne, Switzerland. It dates from between 320 and 250 BC. The calvarium, the left half of the pelvis and the left femur were preserved. The finding shows an unusual bony alteration of the skull. The aim of this study was to obtain a differential diagnosis and to examine the skull using various methods. Sex and age were determined anthropologically. Radiological examinations were performed with plain X-ray imaging and a multislice computed tomography (CT) scanner. For histological analysis, samples of the lesion were taken. The pathological processing included staining after fixation, decalcification, and paraffin embedding. Hard-cut sections were also prepared. The individual was female. The age at death was between 30 and 50 years. There is an intensely calcified bone proliferation at the right side of the os frontalis. Plain X-ray and CT imaging showed a large sclerotic lesion in the area of the right temple with a partly bulging appearance. The inner boundary of the lesion shows multi-edged irregularities. There is a diffuse thickening of the right side. In the left skull vault, there is a mix of sclerotic areas and areas which appear to be normal with a clear differentiation between tabula interna, diploë and tabula externa. Histology showed mature organised bone tissue. Radiological and histological findings favour a benign condition. Differential diagnoses comprise osteomas which may occur, for example, in the setting of hereditary adenomatous polyposis coli related to Gardner syndrome. PMID:23897004

Moghaddam, Negahnaz; Langer, Rupert; Ross, Steffen; Nielsen, Ebbe; Lösch, Sandra

2013-01-01

230

[Unusual presentation of giant thymolipoma].  

PubMed

Thymolipoma is a rare thymic tumor; His frequency is estimated at 2 at 9% of all thymic tumors. His diagnosis usually easy, can be difficult with an unusual radio clinic pattern, but actually get benefice from progress in radiologic investigations especially MRI. We reported a case of a 36-year old woman, admitted for a left pleuro-pneumopathy investigation. Evolution, after antibiotic treatment and pleural effusion draining, was well. However, patient developed systolic aortic murmur and a chest-X-ray cardiomegaly supposing cardiologic dysfunction. But the normality of cardiac sonography, the ascension of diaphragma and non-specific thoracic sonographic pattern, guided to thoracic MRI. This exploration demonstrated a giant thymolipoma, which was confirmed by the histologic examination of a resected mass. PMID:12708194

Fenniche, Soraya; Maalej, Sonia; Hassene, Hela; Hantous, Saoussen; Belhabib, Dalenda; Bakkari, Sonia; el Mezni, Faouzi; Horchani, Habiba; Megdiche Mohamed, Lamine

2003-01-01

231

Unusual locations of osteoarticular tuberculosis.  

PubMed

Tuberculosis continues to occur frequently in some underdeveloped regions. Bone and joint tuberculosis is less common than the pulmonary form. Fourteen cases of bone and joint tuberculosis in unusual locations are presented. Tuberculostatic treatment and surgical approach were associated in all the patients. In 6 cases an arthrodesis of the affected joint was carried out. A surgical debridement was done in 6 patients and a needle biopsy in 2 patients in order to obtain samples for pathology and bacteriology. Twelve of the 14 patients recovered. One patient who was affected by atlanto-axial tuberculosis died within the immediate postoperative period. A second one affected by the acquired immunodefiency syndrome died 4 months after surgery. PMID:9266032

García, S; Combalía, A; Serra, A; Segur, J M; Ramón, R

1997-01-01

232

CT findings in Petersen's hernia as a complication of bariatric surgery with a Roux-en-Y gastric bypass Achados tomográficos na hérnia de Petersen como complicação de cirurgia bariátrica com bypass gástrico em Y de Roux  

Microsoft Academic Search

Objectives: To describe tomographic findings in Petersen's hernia associated with laparoscopic Roux-en-Y gastric bypass surgery. Methods: Two radiologists, experts in abdominal radiology, independently and retrospectively reviewed four cases of Petersen's hernia confirmed surgically in three patients, between March 2007 and July 2008, who had undergone laparoscopic Roux-en-Y gastric bypass surgery with an antecolic anastomosis for treating morbid obesity. The main

Mauricio Álvares; Salum Ximenes; Ronaldo Hueb Baroni; Ronald Trindade; Rodrigo Abdala; Marcelo de Castro; Jorge Racy; Alberto Goldenberg; Thomas Szego; Almino Cardoso Ramos; Marcelo Buarque de Gusmão Funari

233

Intraventricular Hemorrhage after Epidural Blood Patching: An Unusual Complication  

PubMed Central

The authors present two cases of intraventricular hemorrhage (IVH) believed to be a result of epidural blood patching. The first was a 71-year-old woman who had new onset of nontraumatic IVH on computed tomography (CT) scan after undergoing an epidural blood patch (EBP). This amount of intraventricular blood was deemed an incidental finding since it was of very small volume to account for her overall symptoms. The second patient, a 29-year-old woman, was found to have nontraumatic IVH three days after undergoing an EBP. This was seen on CT scan of the head for workup of pressure-like headaches, nausea, vomiting, and absence seizures. Conservative management was followed in both instances. Serial CT scan of the head in our first patient displayed complete resolution of her IVH. The second patient did not have follow-up CT scans because her overall clinical picture had improved significantly. This highlights a potential sequel of EBP that may be observed on CT scan of the head. In the event that IVH is detected, signs and symptoms of hydrocephalus should be closely monitored with the consideration for a future workup if warranted by the clinical picture. PMID:25544916

Couldwell, William T.

2014-01-01

234

Combined PET and low-dose, noncontrast CT scanning obviates the need for additional diagnostic contrast-enhanced CT scans in patients undergoing staging or restaging for lymphoma  

PubMed Central

Background: Positron emission tomography (PET) is more accurate than computed tomography (CT) in staging and restaging of lymphoma, but both are considered necessary. Increasingly, PET is carried out with a low-dose CT scan. Many patients undergo both PET/CT and standard diagnostic CT. The clinical utility of performing both studies in patients with lymphoma was evaluated. Patients and methods: Patients with lymphoma who underwent concurrent PET/CT and diagnostic CT (a scan pair) were identified, and findings detected in either scan but not both were documented. Discrepancies were considered significant if they were related to either lymphoma or another disease process which potentially required intervention. Results: Eighty-seven scan pairs were identified. PET/CT detected additional lesions over diagnostic CT in 30 patients, of which 11 demonstrated increased clinical stage. Lymphoma therapy changed based on PET/CT in two patients, and one occult rectal cancer was detected. In contrast, diagnostic CT detected five relevant findings, including two incidental findings (venous thrombosis) and three patients with splenic lesions, none of which could be confirmed as lymphoma. No patient had change of stage or lymphoma therapy based on diagnostic CT. Conclusion: In our series, diagnostic CT did not add value to staging or restaging of lymphoma when carried out concurrently with PET/CT. PMID:18550578

Elstrom, R. L.; Leonard, J. P.; Coleman, M.; Brown, R. K. J.

2008-01-01

235

Cardiac PET-CT.  

PubMed

Integrated positron emission tomography computed tomography (PET/CT) scanners allow a true integration of the structure and function of the heart. Myocardial perfusion PET provides a high sensitivity (91%) and specificity (89%) for the diagnosis of obstructive coronary artery disease (CAD). But, as with single photon emission CT, relative perfusion PET often uncovers only the territory subtended by the most severe coronary stenosis, leading to underestimation of the extent of CAD. In contrast, quantitative PET provides a noninvasive assessment of myocardial blood flow and coronary flow reserve and improves detection of preclinical and multivessel coronary atherosclerosis. Similarly, CT coronary angiography is an accurate means to image the entire continuum of anatomic coronary atherosclerosis from nonobstructive to obstructive CAD. However, not all coronary stenoses are hemodynamically significant and <50% of the patients with obstructive CAD on CT angiography demonstrate stress induced perfusion defects. Stress PET data complement the anatomic information on the CT angiogram by providing instant readings about the ischemic burden of coronary stenoses. Thus, combined PET/CT may be potentially superior to CT angiography alone for the guiding revascularization decisions. Further, fusion of the PET and CT angiogram images allows identification of the culprit stenosis in patients presenting with chest pain. Finally, the advances in molecular imaging and image fusion may soon make noninvasive detection of vulnerable coronary plaques a clinical reality. In summary, integrated PET/CT is a powerful new noninvasive modality that offers the potential for refined diagnosis and management of the entire spectrum of coronary atherosclerosis. PMID:17325581

Di Carli, Marcelo F; Dorbala, Sharmila

2007-02-01

236

Unusual scintigraphic appearance of perforation of the common bile duct.  

PubMed

This report deals with the diagnosis of perforation of the common bile duct into the lesser sac by HIDA cholescintigraphy. The first hour images after injection were suggestive of biliary obstruction. Subsequent images demonstrated unusual accumulations of the activity into the lesser sac and retroperitoneal potential spaces. Careful correlation between scintigraphic and surgical findings were undertaken. The case is reported to demonstrate the scintigraphic findings in choledochal perforation and to stress the importance of carrying out late images when the initial ones are abnormal. PMID:6686097

Acevedo, M O; Tauxe, W N; Scott, J W; Aldrete, J S

1983-12-01

237

Rock Finding  

ERIC Educational Resources Information Center

In this article, the authors discuss a literature-based activity that helps students discover the importance of making detailed observations. In an inspiring children's classic book, "Everybody Needs a Rock" by Byrd Baylor (1974), the author invites readers to go "rock finding," laying out 10 rules for finding a "perfect" rock. In this way, the…

Rommel-Esham, Katie; Constable, Susan D.

2006-01-01

238

Nanoexposure, Unusual Diseases, and New Health and Safety Concerns  

PubMed Central

Accumulating studies in animals have shown that nanoparticles could cause unusual rapid lung injury and extrapulmonary toxicity. Whether exposure of workers to nanoparticles may result in some unexpected damage as seen in animals is still a big concern. We previously reported findings regarding a group of patients exposed to nanoparticles and presenting with an unusual disease. The reported disease was characterized by bilateral chest fluid, pulmonary fibrosis, pleural granuloma, and multiorgan damage and was highly associated with the nanoparticle exposure. To strengthen this association, further information on exposure and the disease was collected and discussed. Our studies show that some kinds of nanomaterials, such as silica nanoparticles and nanosilicates, may be very toxic and even fatal to occupational workers exposed to them without any effective personal protective equipment. More research and collaborative efforts on nanosafety are required in order to prevent and minimize the potential hazards of nanomaterials to humans and the environment. PMID:22125440

Song, Yuguo; Tang, Shichuan

2011-01-01

239

Pneumoconiosis: Comparison of imaging and pathologic findings  

SciTech Connect

Pneumoconiosis may be classified as either fibrotic or nonfibrotic, according to the presence or absence of fibrosis. Silicosis, coal worker pneumoconiosis, asbestosis, berylliosis, and talcosis are examples of fibrotic pneumoconiosis. Siderosis, stannosis, and baritosis are nonfibrotic forms of pneumoconiosis that result from inhalation of iron oxide, tin oxide, and barium sulfate particles, respectively. In an individual who has a history of exposure to silica or coal dust, a finding of nodular or reticulonodular lesions at chest radiography or small nodules with a perilymphatic distribution at thin-section computed tomography (CT), with or without eggshell calcifications, is suggestive of silicosis or coal worker pneumoconiosis. Magnetic resonance imaging is helpful for distinguishing between progressive massive fibrosis and lung cancer. CT and histopathologic findings in asbestosis are similar to those in idiopathic pulmonary fibrosis, but the presence of asbestos bodies in histopathologic specimens is specific for the diagnosis of asbestosis. Giant cell interstitial pneumonia due to exposure to hard metals is classified as a fibrotic form of pneumoconiosis and appears on CT images as mixed ground-glass opacities and reticulation. Berylliosis simulates pulmonary sarcoidosis on CT images. CT findings in talcosis include small centrilobular and subpleural nodules or heterogeneous conglomerate masses that contain foci of high attenuation indicating talc deposition. Siderosis is nonfibrotic and is indicated by a CT finding of poorly defined centrilobular nodules or ground-glass opacities.

Chong, S.; Lee, K.S.; Chung, M.J.; Han, J.H.; Kwon, O.J.; Kim, T.S. [Sungkyunkwan University School of Medicine, Seoul (Republic of Korea). Samsung Medical Center

2006-01-15

240

Pneumoconiosis: comparison of imaging and pathologic findings  

SciTech Connect

Pneumoconiosis may be classified as either fibrotic or nonfibrotic, according to the presence or absence of fibrosis. Silicosis, coal worker pneumoconiosis, asbestosis, berylliosis, and talcosis are examples of fibrotic pneumoconiosis. Siderosis, stannosis, and baritosis are nonfibrotic forms of pneumoconiosis that result from inhalation of iron oxide, tin oxide, and barium sulfate particles, respectively. In an individual who has a history of exposure to silica or coal dust, a finding of nodular or reticulonodular lesions at chest radiography or small nodules with a perilymphatic distribution at thin-section computed tomography (CT), with or without eggshell calcifications, is suggestive of silicosis or coal worker pneumoconiosis. Magnetic resonance imaging is helpful for distinguishing between progressive massive fibrosis and lung cancer. CT and histopathologic findings in asbestosis are similar to those in idiopathic pulmonary fibrosis, but the presence of asbestos bodies in histopathologic specimens is specific for the diagnosis of asbestosis. Giant cell interstitial pneumonia due to exposure to hard metals is classified as a fibrotic form of pneumoconiosis and appears on CT images as mixed ground-glass opacities and reticulation. Berylliosis simulates pulmonary sarcoidosis on CT images. CT findings in talcosis include small centrilobular and subpleural nodules or heterogeneous conglomerate masses that contain foci of high attenuation indicating talc deposition. Siderosis is nonfibrotic and is indicated by a CT finding of poorly defined centrilobular nodules or ground-glass opacities.

Semin Chong; Kyung Soo Lee; Myung Jin Chung; Joungho Han; O. Jung Kwon; d Tae Sung Kim [Sungkyunkwan University School of Medicine, Seoul (Republic of Korea). Department of Radiology and Center for Imaging Science

2006-01-15

241

Computed Tomography (CT) - Spine  

MedlinePLUS

... verifies that the images are of high enough quality for accurate interpretation. The CT scanning is usually completed within 30 minutes. top ... Contrast Media and its references. ... to radiation, they should have a CT exam only if it is essential for making ...

242

SpaceWire Tiger Team Findings and Suggestions  

NASA Technical Reports Server (NTRS)

This technical report intends to highlight the key findings and recommendations of the SpaceWire Tiger Team for the CoNNeCT project. It covers findings which are technical in nature, covering design concepts and approaches.

Ishac, Joseph A.

2011-01-01

243

Primary and secondary histiocytic lymphoma of the brain: CT features  

SciTech Connect

The authors examined 19 patients with diffuse histiocytic lymphoma of the brain, including 8 with primary disease and 11 with secondary disease. Both primary disease and secondary disease involving the brainstem and deep nuclei exhibited the characteristic CT appearance, consisting of a large, solid, homogeneously enhanced mass with varying amounts of edema. However, most secondary lymphomas outside the brainstem and basal ganglia contained large areas of low attenuation consistent with necrosis. Multifocal lesions were seen only in patients with secondary lymphoma. Systemic chemotherapy for extracranial lymphoma had no effect on the CT appearance of intracranial lesions. The authors suggest that these unusual CT patterns are actually typical of a distinct subset of histiocytic lymphomas.

Yang, P.J.; Knake, J.E.; Gabrielsen, T.O.; Latack, J.T.; Gebarski, S.S.; Mehta, B.A.; Metes, J.J.

1985-03-01

244

Scrub Typhus: Radiological and Clinical Findings  

Microsoft Academic Search

OBJECTIVES: To describe the radiological and clinical findings of scrub typhus. We retrospectively analysed the radiographic, thin-section CT and clinical features of scrub typhus.METHODS: The study included 75 consecutive patients (median age=47 years, range=18–81 years) with scrub typhus. Plain chest radiographs were obtained in all 75 patients and 19 underwent thin-section CT within 6 days of initial radiography. The radiographic

Y. H. CHOI; S. J. KIM; J. Y. LEE; H. J. PAI; K. Y. LEE; Y. S. LEE

2000-01-01

245

Thoracic Computed Tomography Findings in Malignant Mesothelioma  

PubMed Central

Background Malignant pleural mesothelioma (MPM) is an uncommon neoplasm. MPM occurs more frequently in patients born or living in certain villages of Turkey. Objectives We aimed to review radiological findings of MPM. Patients and Methods We reviewed the CT findings in 219 biopsy-proven MPM patients admitted to our clinic between 1993 and 2008. Results The most common CT findings included pleural thickening (n=197, 90%) classified as diffuse (n=138, 63%), nodular (n=49, 22%) and mass-type (n=16, 7%). Pleural effusion was found in 173 patients (79%), involvement of the interlobar fissures in 159 (73%), mediastinal pleural involvement in 170 (78%), volume contraction in 142 (65%), mediastinal shift in 102 (47%) and mediastinal lymphadenopathy in 54 (25%). Conclusion MPM may present with diverse radiological features. Pleural thickening and pleural effusion were the most frequent radiological findings. Thoracic CT scans might be assessed more cautiously in patients with environmental exposure to asbestos. PMID:23407863

Tamer Dogan, Omer; Salk, Ismail; Tas, Fikret; Epozturk, Kursat; Gumus, Cesur; Akkurt, Ibrahim; Levent Ozsahin, Sefa

2012-01-01

246

Concerted evolution of the tandemly repeated genes encoding primate U2 small nuclear RNA (the RNU2 locus) does not prevent rapid diversification of the (CT){sub n} {center_dot} (GA){sub n} microsatellite embedded within the U2 repeat unit  

SciTech Connect

The RNU2 locus encoding human U2 small nuclear RNA (snRNA) is organized as a nearly perfect tandem array containing 5 to 22 copies of a 5.8-kb repeat unit. Just downstream of the U2 snRNA gene in each 5.8-kb repeat unit lies a large (CT){sub n}{center_dot}(GA){sub n} dinucleotide repeat (n {approx} 70). This form of genomic organization, in which one repeat is embedded within another, provides an unusual opportunity to study the balance of forces maintaining the homogeneity of both kinds of repeats. Using a combination of field inversion gel electrophoresis and polymerase chain reaction, we have been able to study the CT microsatellites within individual U2 tandem arrays. We find that the CT microsatellites within an RNU2 allele exhibit significant length polymorphism, despite the remarkable homogeneity of the surrounding U2 repeat units. Length polymorphism is due primarily to loss or gain of CT dinucleotide repeats, but other types of deletions, insertions, and substitutions are also frequent. Polymorphism is greatly reduced in regions where pure (CT){sub n} tracts are interrupted by occasional G residues, suggesting that irregularities stabilize both the length and the sequence of the dinucleotide repeat. We further show that the RNU2 loci of other catarrhine primates (gorilla, chimpanzee, ogangutan, and baboon) contain orthologous CT microsatellites; these also exhibit length polymorphism, but are highly divergent from each other. Thus, although the CT microsatellite is evolving far more rapidly than the rest of the U2 repeat unit, it has persisted through multiple speciation events spanning >35 Myr. The persistence of the CT microsatellite, despite polymorphism and rapid evolution, suggests that it might play a functional role in concerted evolution of the RNU2 loci, perhaps as an initiation site for recombination and/or gene conversion. 70 refs., 5 figs.

Liao, D.; Weiner, A.M. [Yale Univ., New Haven, CT (United States)] [Yale Univ., New Haven, CT (United States)

1995-12-10

247

Rheological Characterization of Unusual DWPF Slurry Samples (U)  

SciTech Connect

A study was undertaken to identify and clarify examples of unusual rheological behavior in Defense Waste Processing Facility (DWPF) simulant slurry samples. Identification was accomplished by reviewing sludge, Sludge Receipt and Adjustment Tank (SRAT) product, and Slurry Mix Evaporator (SME) product simulant rheological results from the prior year. Clarification of unusual rheological behavior was achieved by developing and implementing new measurement techniques. Development of these new methods is covered in a separate report, WSRC-TR-2004-00334. This report includes a review of recent literature on unusual rheological behavior, followed by a summary of the rheological measurement results obtained on a set of unusual simulant samples. Shifts in rheological behavior of slurries as the wt. % total solids changed have been observed in numerous systems. The main finding of the experimental work was that the various unusual DWPF simulant slurry samples exhibit some degree of time dependent behavior. When a given shear rate is applied to a sample, the apparent viscosity of the slurry changes with time rather than remaining constant. These unusual simulant samples are more rheologically complex than Newtonian liquids or more simple slurries, neither of which shows significant time dependence. The study concludes that the unusual rheological behavior that has been observed is being caused by time dependent rheological properties in the slurries being measured. Most of the changes are due to the effect of time under shear, but SB3 SME products were also changing properties while stored in sample bottles. The most likely source of this shear-related time dependence for sludge is in the simulant preparation. More than a single source of time dependence was inferred for the simulant SME product slurries based on the range of phenomena observed. Rheological property changes were observed on the time-scale of a single measurement (minutes) as well as on a time scale of hours to weeks. The unusual shape of the slurry flow curves was not an artifact of the rheometric measurement. Adjusting the user-specified parameters in the rheometer measurement jobs can alter the shape of the flow curve of these time dependent samples, but this was not causing the unusual behavior. Variations in the measurement parameters caused the time dependence of a given slurry to manifest at different rates. The premise of the controlled shear rate flow curve measurement is that the dynamic response of the sample to a change in shear rate is nearly instantaneous. When this is the case, the data can be fitted to a time independent rheological equation, such as the Bingham plastic model. In those cases where this does not happen, interpretation of the data is difficult. Fitting time dependent data to time independent rheological equations, such as the Bingham plastic model, is also not appropriate.

Koopman, D. C.

2005-09-01

248

MR and CT of brain's cava.  

PubMed

The Cavum Septi Pellucidi (CSP), Cavum Vergae (CV) and Cavum Veli Interpositi, are anatomical variants located in the midline of the brain. It is important to identify these conditions to distinguish them from other entities that may require treatment. In this paper, our purpose is to describe MR and CT findings of CSP, CV and Cavum Veli Interpositi, explaining the differential diagnosis. PMID:23320830

Saba, Luca; Anzidei, Michele; Raz, Eytan; Suri, Jasjit; Piga, Mario; Grassi, Roberto; Catalano, Carlo

2013-07-01

249

Finding Perimeter  

NSDL National Science Digital Library

In this lesson, students will explore a real world problem based on the Marilyn Burns book Spaghetti and Meatballs for All!. The problem and further practice finding the distance around rectangles will lead them to discover efficient strategies and formulas for solving perimeter.

Strickland, Susanna

2012-07-27

250

[Silicosis: computed tomography findings].  

PubMed

Silicosis is an occupational lung disease, which is caused by the inhalation of silica and affects a wide range of jobs. There are many clinical forms of silicosis: acute silicosis, results from exposure to very large amounts of silica dust over a period of less than 2 years. Simple chronic silicosis, the most common type that we see today, results from exposure to low amounts of silica between 2 and 10 years. Chronic silicosis complicated, with silicotic conglomerates. In many cases the diagnosis of silicosis is made according to epidemiological and radiological data, without a histological confirmation. It is important to know the various radiological manifestations of silicosis to differentiate it from other lung diseases and to recognize their complications. The objective of this work is to describe typical and atypical radiological findings of silicosis and their complications in helical and high resolution (HRCT) thorax CT. PMID:22884889

González Vázquez, M; Trinidad López, C; Castellón Plaza, D; Calatayud Moscoso Del Prado, J; Tardáguila Montero, F

2013-01-01

251

An unusual origin of the celiac trunk and the superior mesenteric artery in the thorax.  

PubMed

The authors report a case of a 44-year-old male found to have unusual origins of the celiac trunk (CT) and superior mesernteric artrery (SMA) as revealed by routine multidetector computed tomograph (MDCT) angiography. The CT and SMA originate from the thoracic aorta (TA) 21 mm and 9 mm above the aortic hiatus, respectively. The median arcuate ligament (MAL) is located at the level of the L1-L2 intervertebral disc. The course of the CT descends in the thoracic cavity making a 14° acute downward angle in front of the TA; below the level of the MAL, the CT descends, making an angle of 47°. The course of the SMA descends at both the thoracic and abdominal level making an angle of 17°, and having an aortomesenteric distance of 9 mm at the level of the third part of the duodenum. In the present case, the supradiaphragmatic origin of the CT and the SMA was determined by their incomplete caudal descent, associated with a pronounced apparent descent of the diaphragm. A thoracic origin of the CT and SMA and the acute downward aortomesenteric angle (17°) associated with a reduced aortomesenteric distance at the level of the third part of the duodenum (9 mm), although no clinical signs are present, may predispose the patient to develop simultaneously a triple syndrome: the compression of CT by MAL (celiac axis compression syndrome), the compression of SMA by MAL (superior mesenteric artery compression syndrome), and the compression of the duodenum by the SMA (superior mesenteric artery syndrome). PMID:24108529

Matusz, Petru; Iacob, Nicoleta; Miclaus, Gratian D; Pureca, Ana; Ples, Horia; Loukas, Marios; Tubbs, R Shane

2013-11-01

252

CT head in children.  

PubMed

The advances in computerized technology (CT) technique over the last few decades have greatly modified imaging protocols in children. The range of pathologies that can now be demonstrated has broadened with the advent of newer techniques such as CT perfusion and the ability to perform complex reconstructions. Increasing speed of scanning and reduction in scan time have influenced the need for sedation and general anaesthetic as well as impacting on motion artefact. Additionally, concerns about radiation safety and avoidance of unnecessary radiation have further impacted on the inclusion of CT in the imaging armamentarium. Justification and image optimisation are essential. It is important to familiarize oneself with the appearances of normal variants or age related developmental changes. CT does however remain an appropriate investigation in a number of conditions. PMID:22209524

Rao, Padma; Bekhit, Elhamy; Ramanauskas, Fiona; Kumbla, Surekha

2013-07-01

253

Normal Chest CT  

NSDL National Science Digital Library

Set of normal chest CT images with various important anatomic structures outlined, for cine viewing to gain a 3D view of the structure and its relationship to adjacent organs.Annotated: trueDisease diagnosis: Normal

Shaffer, Kitt

254

Normal Abdominal CT  

NSDL National Science Digital Library

Set of normal abdominal CT images with various important anatomic structures outlined, for cine viewing to gain a 3D view of the structure and its relationship to adjacent organs.Annotated: trueDisease diagnosis: Normal

Shaffer, Kitt

255

Factor Findings  

NSDL National Science Digital Library

In this lesson, students first create factor posters for a variety of different numbers that will be displayed in the classroom to be utilized as a resource throughout the school year. They make discoveries about factors using color tiles, represent their discoveries using graph paper, and display their information on poster board as find factors of an assigned number. The plan includes a list of materials, questions, assessment options, and extensions.

Piecora, Jamie

2000-01-01

256

Main Findings  

Cancer.gov

This study looked at the ALTS patients with ASCUS who were found to have a precancerous lesion when they underwent colposcopy and biopsy. Its purpose was to find out how sensitive HPV testing was at identifying these women compared to repeat Pap testing. The study found that HPV testing was 96-percent sensitive - that is, identified 96% of the women with ASCUS who had a precancerous lesion. The authors concluded that HPV testing is a viable option for the management of ASCUS.

257

Correlation of Chest Radiograph and CT of the Heart  

Microsoft Academic Search

\\u000a Routinely visible imaging features of the heart are many times underappreciated by general radiologists, often due to a lack\\u000a of specific radiological training. Nevertheless, the increasing use of CT for evaluation of the heart and coronary arteries\\u000a offers a unique opportunity to revisit the imaging findings of this organ, correlating CT and conventional radiograph imaging\\u000a findings. As such, common semiologic

Rodrigo A. Salgado

258

Improvement in CT pelvimetry  

SciTech Connect

When computed tomographic (CT) digital radiography is used for pelvimetry, measurement error may occur. Geometric distortion in the lateral direction of the CT digital radiograph can lead to an error in any measurement of the transverse pelvic inlet. The authors measured the magnitude of this error on two scanners and present a general method for correction of this potential error. The authors also showed that an additional dose reduction is possible if the patient is imaged in the posteroanterior rather than anteroposterior projection.

Wiesen, E.J.; Crass, J.R.; Bellon, E.M.; Ashmead, G.G.; Cohen, A.M. (Case Western Reserve Univ., Cleveland, OH (USA))

1991-01-01

259

CT of pituitary abscess  

SciTech Connect

Pituitary abscess is a rare condition, with only 50 cases reported in the literature. Of those, 29 cases were well documented for analysis. Preoperative diagnosis of pituitary abscess is difficult. The computed tomographic (CT) appearance of pituitary abscess was first described in 1983; the abscess was depicted by axial images with coronal reconstruction. The authors recently encountered a case of pituitary abscess documented by direct coronal CT of the sella turcica.

Fong, T.C.; Johns, R.D.; Long, M.; Myles, S.T.

1985-06-01

260

Unusual Structure and Magnetism in MnO Nanoclusters  

E-print Network

We report an unusual evolution of structure and magnetism in stoichiometric MnO clusters based on an extensive and unbiased search through the potential energy surface within density functional theory. The smaller clusters, containing up to five MnO units, adopt two-dimensional structures; and regardless of the size of the cluster, magnetic coupling is found to be antiferromagnetic in contrast to previous theoretical findings. Predicted structure and magnetism are strikingly different from the magnetic core of Mn-based molecular magnets, whereas they were previously argued to be similar. Both of these features are explained through the inherent electronic structures of the clusters.

Ganguly, Shreemoyee; Sanyal, Biplab; Mookerjee, Abhijit; 10.1103/PhysRevB.83.020411

2011-01-01

261

The cruel and unusual phenomenology of solitary confinement  

PubMed Central

What happens when subjects are deprived of intersubjective contact? This paper looks closely at the phenomenology and psychology of one example of that deprivation: solitary confinement. It also puts the phenomenology and psychology of solitary confinement to use in the legal context. Not only is there no consensus on whether solitary confinement is a “cruel and unusual punishment,” there is no consensus on the definition of the term “cruel” in the use of that legal phrase. I argue that we can find a moral consensus on the meaning of “cruelty” by looking specifically at the phenomenology and psychology of solitary confinement. PMID:24971072

Gallagher, Shaun

2014-01-01

262

Computational investigation of unusual behavior in certain capillary tubes  

SciTech Connect

We investigate computationally two recent mathematical findings involving unusual behavior of solutions of the Young-Laplace capillary equation in cylindrical tubes of particular sections. The first concerns a configuration for which smoothing of the boundary curve at a sharp corner leads from existence to non-existence of a solution over the container section in zero gravity. The second describes a discontinuous behavior of relative rise height in nesting tubes placed vertically in an infinite reservoir. The numerical results support and quantify the mathematical predictions.

Brady, Victor; Concus, Paul; Finn, Robert

2004-03-12

263

Unusual fractures associated with osteoporosis in premenopausal women.  

PubMed Central

Two premenopausal women (aged 40 and 34 years) and multiple undisplaced, often asymptomatic fractures of the femurs, ribs, metatarsals and other bones. The fractures, which appeared on roentgenograms as transverse radiolucent zones with variable callus formation, healed slowly or not at all despite treatment with calcium and vitamin D. They resembled pseudofractures (Looser's transformation zones) radiologically, but the biochemical and histologic findings were those of idiopathic osteoporosis rather than osteomalacia. Since neither patient had been subjected to unusual stress it was concluded that the fractures had resulted from normal activity in abnormal bone. Images FIG. 1 FIG. 2 FIG. 3 FIG. 4 PMID:688148

Richardson, R. M.; Rapoport, A.; Oreopoulos, D. G.; Meema, H. E.; Rabinovich, S.

1978-01-01

264

Use of CT in the evaluation of cochlear otosclerosis  

SciTech Connect

Otosclerosis (otospongiosis) occurs when the hard endochondral bone of the otic capsule is replaced by spongy vascular foci of haversian bone. Using computed tomography (CT), the authors studied the ears of 32 selected patients with mixed or sensorineural hearing loss; 24 were suspected of having otosclerosis. CT proved valuable in detecting cochlear otosclerosis, foci of demineralization, and changes in bony texture and enables the easy recognition of subtle radiographic findings. This paper also reports the CT findings of temporal bones in osteogenesis imperfecta and Paget disease.

Mafee, M.F.; Valvassori, G.E.; Deitch, R.L.; Norouzi, P.; Henrikson, G.C.; Capek, V.; Applebaum, E.L.

1985-09-01

265

Aberrant radial-ulnar nerve communication in the upper arm presenting as an unusual radial nerve palsy: a case report.  

PubMed

An unusual communication between the radial and ulnar nerves was observed during repair of a fracture of the humerus in an adult patient who presented with unusual physical exam findings. The patient had loss of radial and ulnar nerve motor function, as well as decreased sensation in both nerve distributions. Radial nerve injury following fracture of the humerus is a common condition, and anatomic variations are therefore of importance to clinicians. Communications between branches of the brachial plexus are also not uncommon findings; however there is very little mention of communication between the radial and ulnar nerves in the literature. An appreciation of unusual nerve anatomy is important in explaining unusual finding in patients. PMID:25481257

Lombardo, Daniel J; Buzas, David; Siegel, Geoffrey; Afsari, Alan

2014-12-01

266

Unusual clinical manifestation of lymphangiomatosis.  

PubMed

A 6-year- old boy presented with disseminated intravascular coagulation and was diagnosed with lymphangiomatosis. Disseminated intravascular coagulation develops in a minority of cases. Bone lesions were present on his left shoulder. The authors discuss the diagnostic findings and medical management. PMID:21980740

Prieur, O; Damry, N; Heijmans, C; Christophe, C

2011-01-01

267

Bilateral hydatid cyst of pulmonary arteries: MR and CT findings.  

PubMed

The location of hydatid cysts inside pulmonary arteries has been reported only on rare occasions in the literature and is caused, in the majority of cases, by embolization due to the rupture of hydatid cysts located in the heart; more rarely, hematogenous dissemination from a hepatic focus is the cause. We report a case of a 44-year-old patient with hydatid cysts located in both the right and left pulmonary arteries, whose first clinical reference was hemoptysis. The patient had undergone surgery because of a hepatic hydatid cyst 5 months previously. The importance of this case lies in the infrequent bilateral location in both pulmonary arteries and in the absence of intracardiac hydatid cysts. PMID:9724432

Yagüe, D; Lozano, M P; Lample, C; Nuñez, M E; Sánchez, F

1998-01-01

268

Hepatic metastasis disguised as fat spared area in the background of fatty liver: Detection on FDG PET/CT  

PubMed Central

Area of fat sparing in fatty liver is known to pose a diagnostic challenge in an oncological setting, especially in cancers with higher propensity for liver metastases. We report an unusual appearance of hepatic metastases in a fat spared area, on both computed tomography (CT) and positron emission tomography (PET), in a combined 18 fluorine-fluorodeoxyglucose (18 F-FDG) PET/CT study done in metastatic adenocarcinoma of colon. PMID:24163515

Puranik, Ameya D; Purandare, Nilendu C; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2013-01-01

269

Hepatic metastasis disguised as fat spared area in the background of fatty liver: Detection on FDG PET/CT.  

PubMed

Area of fat sparing in fatty liver is known to pose a diagnostic challenge in an oncological setting, especially in cancers with higher propensity for liver metastases. We report an unusual appearance of hepatic metastases in a fat spared area, on both computed tomography (CT) and positron emission tomography (PET), in a combined 18 fluorine-fluorodeoxyglucose (18 F-FDG) PET/CT study done in metastatic adenocarcinoma of colon. PMID:24163515

Puranik, Ameya D; Purandare, Nilendu C; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2013-04-01

270

An unusual case of "dyadic-death" with a single gunshot.  

PubMed

The terms "dyadic death" or "murder-suicide" refer to an incident where an individual commits homicide and then takes his or her own life. These events are generally committed by men within the family network, using firearms or sharp force instruments, and make up a relatively small proportion of homicides overall. Herein, we present the application of post-mortem multislice computed tomography (CT) and micro-CT analysis to an unusual case of dyadic death, where a 38-year-old man fired a single gunshot to his own right temple, killing himself and his 50-year-old wife, lying on the bed beside him. The integration of radiological, autoptic and histological data allowed us to reconstruct the trajectory of the gunshot, the most probable dynamics of the event, and to classify the incident as a "suicide-homicide", because the female victim died a few minutes later than her husband and murderer. PMID:25194714

Viero, Alessia; Giraudo, Chiara; Cecchetto, Giovanni; Muscovich, Cristina; Favretto, Donata; Puglisi, Massimo; Fais, Paolo; Viel, Guido

2014-11-01

271

Finding Fossils  

NSDL National Science Digital Library

This OLogy activity serves as a kid-friendly how-to manual about searching for fossils. In Not Just Any Rock Will Do, kids learn that fossils "hide out" in sedimentary rock and see examples of shale and sandstone. Do's and Don'ts for Fossil Hunters gives kids practical tips and a list of fossil-hunting supplies. In Fossils You May Find, there are photos of common invertebrate, vertebrate, and plant fossils to guide kids. Paleontology Clubs and Web Sites lists resources to help kids determine where to hunt for fossils. In Keeping a Field Journal, kids are shown a sample journal entry that points out the types of information they should record.

272

Comparison between helical computed tomography angiography and intraoperative findings  

PubMed Central

Background: Live donor nephrectomy has gained popularity on account of the laparoscopic technique, to overcome a small donor pool. Laparoscopic donor nephrectomy requires a precise study of the vascular and morphological renal anatomy, as laparoscopy is technically challenging due to the limited field of vision. In-depth knowledge of the renal anatomy before a laparoscopic procedure is essential for a successful transplant. The left kidney is preferred over the right even in cases of multiple vessels because of the long renal vein, which requires precise preoperative vascular mapping. Helical computerized tomography (CT) angiography, with its axial, coronal, and 3D reconstruction, gives a better understanding of renal anatomy. There are instances where the helical CT findings are misleading and less informative in a small number of cases. This study highlights a case study of the helical CT findings compared with the intraoperative findings of 200 live donors, who underwent laparoscopic donor nephrectomy, and the renal anatomy has been understood at the same time. Aims: 1. To compare the helical CT findings on the operated side with the intraoperative findings. 2. To analyze the CT findings Materials and Methods: Two hundred cases of laparoscopic transperitoneal donor nephrectomy were included in this study. Statistical Method Used: Chi square test was the statistical test used to compare the findings between CT and the intraoperative data. Results: The axial, coronal, and 3D images of the CT findings were on par with the intraoperative findings in most of the cases. Incidental findings help in the better planning of surgery. Multiple vessels on the left side are preferred over the right sided normal anatomy; with not much technical difficulty with the aid of a helical CT. Male donors had more incidences of multiple vessels, gonadal vein, Retroaortic Renal Vein (RARV), lumbar vein, and duplication of ureter, compared to females. Furthermore, these variations are more in the left side donors. Ninety-two percent of the cases in this study are left-sided donors. The helical CT finding shows that renal vein variations are more on the right side. Conclusions: Helical CT is important in delineating the arterial, venous, and ureteral anatomy and can show the important incidental findings. Left renal donors and males have more variations in their renal anatomy. Technically challenging laparoscopic nephrectomy on the multiple-vessel-side donor is possible with the aid of helical CT. The importance of the CT in evaluating donor renal anatomy for a technically challenging laparoscopic donor nephrectomy is commendable. PMID:25136246

Shetty, Abijit; Adiyat, Kishore Thekhe

2014-01-01

273

The need for skull radiography in patients presenting for CT  

SciTech Connect

One thousand patients had both CT of the head and a conventional skull series of radiographs. Radiographic findings were abnormal in 250 patients (25%), but only 64 patients (6.4%) had diagnostically significant abnormalities at radiography that were not detected by CT. If the 163 patients who presented after acute trauma were excluded from the series, only 39 (4.7%) of the remaining patients had radiographically significant abnormal findings that were not seen at CT, and only two (0.2%) of these abnormalities could not be diagnosed by a lateral skull radiograph alone. In only five patients (0.5%) was the management actively changed because an abnormaltiy that was detected at skull radiography was not detected at CT. Thus, in nontrauma patients who have stroke, epilepsy, dementia, or non-specific symptoms without focal signs, or have recently undergone craniotomy, and who have been referred for CT, skull radiographs are not justified. In the patient with a history and findings that are strongly suggestive of a pathological disorder anywhere other than in the sella turcica, cerebello-pontine angle, and paranasal sinuses, only the lateral skull radiograph should be obtained after CT, and only if CT is equivocal.

Tress, B.M.

1983-01-01

274

Appropriateness of selection criteria for CT examinations performed at an emergency department.  

PubMed

In the diagnosis of traumatic and nontraumatic emergencies, computed tomography (CT) is the most frequently performed procedure. The aims of this study were to find out whether CT report results can be used as a reliable tool for the diagnosis and management of patients at an emergency department and to evaluate the appropriateness of the selection criteria for CT examinations. For this reason, we analysed the emergency CT procedures according to the diagnostic hypothesis written on CT request forms, the results of the CT reports and the final diagnosis of the patients. One thousand consecutive CT procedures in the emergency department of a research hospital were retrospectively analysed. When the CT reports and the final diagnosis were evaluated, the sensitivity and specifity of the CT were found to be 0.81 and 0.85. According to the analysis of the CT reports, 55.8 % of all the patients were reported to be normal. When the patient files were examined for the final diagnosis of the patients, 55.7 % of the patients did not receive a final diagnosis related to the diagnostic hypothesis. The lowest correlation was found between the diagnostic hypothesis, the CT reports and the final diagnosis of the patients who underwent cranial CT procedure for trauma. The results of the CT reports can be used as a reliable parameter for the diagnosis and management of the patients at emergency departments. On the other hand, a high negative rate of CT reports was noted especially for the cranial CT examinations. CT selection criteria for the head trauma patients should be reconsidered. Since CT is a procedure involving ionising radiation, it is important that it is performed with the correct indications and the relevant clinical information is specified on the CT request forms. PMID:24848298

Gunes Tatar, Idil; Aydin, Hasan; Kizilgoz, Volkan; Yilmaz, Kerim Bora; Hekimoglu, Baki

2014-12-01

275

Using Helical CT to Predict Stone Fragility in Shock Wave Lithotripsy (SWL)  

SciTech Connect

Great variability exists in the response of urinary stones to SWL, and this is true even for stones composed of the same mineral. Efforts have been made to predict stone fragility to shock waves using computed tomography (CT) patient images, but most work to date has focused on the use of stone CT number (i.e., Hounsfield units). This is an easy number to measure on a patient stone, but its value depends on a number of factors, including the relationship of the size of the stone to me resolution (i.e., the slicewidth) of the CT scan. Studies that have shown a relationship between stone CT number and failure in SWL are reviewed, and all are shown to suffer from error due to stone size, which was not accounted for in the use of Hounsfield unit values. Preliminary data are then presented for a study of calcium oxalate monohydrate (COM) stones, in which stone structure-rather than simple CT number values-is shown to correlate with fragility to shock waves. COM stones that were observed to have structure by micro CT (e.g., voids, apatite regions, unusual shapes) broke to completion in about half the number of shock waves required for COM stones that were observed to be homogeneous in structure by CT. This result suggests another direction for the use of CT in predicting success of SWL: the use of CT to view stone structure, rather than simply measuring stone CT number. Viewing stone structure by CT requires the use of different viewing windows than those typically used for examining patient scans, but much research to date indicates that stone structure can be observed in the clinical setting. Future clinical studies will need to be done to verify the relationship between stone structure observed by CT and stone fragility in SWL.

Williams, James C. Jr.; Zarse, Chad A.; Jackson, Molly E.; McAteer, James A. [Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202 (United States); Lingeman, James E. [Methodist Hospital Institute for Kidney Stone Disease, 1801 North Senate Boulevard, Suite 220, Indianapolis, Indiana 46202 (United States)

2007-04-05

276

[Unusual locations of tuberculosis: three case reports].  

PubMed

We report three cases of tuberculosis of unusual location in Malagasy patients. The first patient presented with intracardiac tuberculoma during pulmonary tuberculosis. The second patient who had no significant musculoskeletal past medical history presented with tuberculous polymyositis. The remaining one presented with tuberculous epididymitis without involvement of the urinary tract. Diagnosis was histopathological. The outcome was favorable in the two last patients with antituberculous therapy. This report emphasizes the necessary awareness of tuberculosis even in the presence of unusual manifestations in hyper-endemic area of tuberculosis. PMID:19233520

Ralandison, S; Rakotoarivelo, R; Rakotovao, M; Raobison, R; Andrianteloasy, S; Rakotoarimanana, S; Rapelanoro Rabenja, F

2009-10-01

277

Student alienation, academic achievement, and WebCT use  

E-print Network

The current investigation sought to understand the relationships between college student alienation, academic achievement, and use of WebCT. Fifty-three students enrolled in an undergraduate educational psychology course provided three types of data: 1) self-rating of eight Likert scale alienation items, 2) academic achievement measured with four types of multiple choice questions evaluating mastery of course content, and 3) use of WebCT defined as total number of Hits, Articles Posted, and Articles Read. Findings suggest that peer alienation was associated with increased WebCT use; learning alienation and course alienation were associated with low WebCT use. Learning alienation demonstrated an inverse relation to academic achievement. In most cases, significant predictive relationships between academic achievement and student use of WebCT were curvilinear.

unknown authors

2005-01-01

278

FaCT and iFaCT  

Microsoft Academic Search

FaCT (Fast Classification of Terminologies) is a De- scription Logic (DL) classifier which has been imple- mented as a test-bed for a sound and complete tableaux satisfiability\\/subsumption testing algorithm. FaCT's novelty lies in its relatively expressive logic and its highly optimised implementation of the tableaux algorithm. iFaCT is an extension of FaCT that supports reason- ing with inverse roles. The

Ian Horrocks

1999-01-01

279

Improvement in CT pelvimetry.  

PubMed

When computed tomographic (CT) digital radiography is used for pelvimetry, measurement error may occur. Geometric distortion in the lateral direction of the CT digital radiograph can lead to an error in any measurement of the transverse pelvic inlet. The authors measured the magnitude of this error on two scanners and present a general method for correction of this potential error. The authors also showed that an additional dose reduction is possible if the patient is imaged in the posteroanterior rather than anteroposterior projection. PMID:1984315

Wiesen, E J; Crass, J R; Bellon, E M; Ashmead, G G; Cohen, A M

1991-01-01

280

Functional significance of an unusual chela dimorphism in a marine decapod  

E-print Network

Functional significance of an unusual chela dimorphism in a marine decapod: specialization morphology does not develop fully in females, so further investigation was confined to males. In males force generation than the straight morphology. The findings suggest that the arched chela morphology

Claverie, Thomas

281

Unusual Presentation of Chronic Eosinophilic Pneumonia with “Reversed Halo Sign”: A Case Report  

PubMed Central

The reversed halo sign (RHS) may sometimes be seen in patients with cryptogenic organizing pneumonia (COP), but is rarely associated with other diseases. Herein, we present a case of a 21-year-old woman with chronic eosinophilic pneumonia, with high resolution computed tomography (HRCT) finding of RHS. This is an unusual and rare presentation of chronic eosinophilic pneumonia. PMID:25035707

Gholamnejad, Mahdia; Rezaie, Nader

2014-01-01

282

Unusual presentation of chronic eosinophilic pneumonia with "reversed halo sign": a case report.  

PubMed

The reversed halo sign (RHS) may sometimes be seen in patients with cryptogenic organizing pneumonia (COP), but is rarely associated with other diseases. Herein, we present a case of a 21-year-old woman with chronic eosinophilic pneumonia, with high resolution computed tomography (HRCT) finding of RHS. This is an unusual and rare presentation of chronic eosinophilic pneumonia. PMID:25035707

Gholamnejad, Mahdia; Rezaie, Nader

2014-05-01

283

ATWAI 12-05-11 GE CT120 CT  

E-print Network

Hardware · Configure microCT as usual ­ select scan protocol that includes gating ­ currently the protocol gating unit · Connect BNC cable from SA-1025T to "input ECG" coaxial connector on microCT ­ use "input the microCT to acquire data at the same time it receives the trigger from the 1025T. · Multiple delays can

Sabatini, David M.

284

CT number variations in micro CT imaging systems  

Microsoft Academic Search

CT numbers can be directly computed from the linear attenuation coefficients in the reconstructed CT images and are correlated to the electron densities of the chemical elements with specific atomic numbers. However, the computed CT numbers can be varied when different imaging parameters are used. Phantoms composed of clinically relevant and tissue-equivalent materials (lung, bone, muscle, and adipose) were scanned

Shu-Ju Tu; Hui-Ling Hsieh; Tsi-Chian Chao

2008-01-01

285

CT and MRI of fibrous dysplasia of the spine  

PubMed Central

Objectives The purpose of this study was to present the CT and MRI findings of patients with fibrous dysplasia (FD) of the spine. Methods Among the patients with pathologically proven skeletal FD, 12 (8 males and 4 females; mean age, 43 years) who were evaluated with either spine CT or MRI were included. The number and location of the involved vertebral segments, the presence of lytic lesions, ground-glass opacity (GGO), an expansile nature, cortical disruption, a sclerotic rim, a decrease in body height and contour deformity were examined on CT scans (n = 12), while signal intensity, enhancement patterns and the presence of a dark signal rim on the lesion were examined using MRI (n = 9). Results Nine patients had polyostotic FD, including one with an isolated spinal localisation, while three had monostotic FD. An expansile nature (n = 3) and osteolytic lesions with GGO (n = 3) were seen. On CT images, GGO was noted in all patients. An expansile nature (n = 11) and presence of lytic lesions (n = 11) were noted. A decrease in body height (n = 9) and sclerotic rim formation (n = 9) were indicated. Contour deformities were visible in six patients. The MRI findings were non-specific. Dark signal rims were visible on MRI in seven patients. Conclusion Typical imaging findings of extraspinal FD were noted on spine CT scans. These characteristic CT imaging findings of spinal FD may be helpful in differentiating FD from other common spine diseases. PMID:22167510

Park, S K; Lee, I S; Choi, J-Y; Cho, K H; Suh, K J; Lee, J W; Song, J W

2012-01-01

286

Leiomyoma in Retzius’ space: An unusual location  

PubMed Central

We report the case of a 54-year-old woman who presented to our hospital with microscopic hematuria. An imaging study revealed a tumour in the Retzius’ space. The tumour was surgically removed by an abdominal approach. Pathological examination revealed a leiomyoma. This case demonstrates a leiomyoma in an unusual location. PMID:24069108

Niwa, Naoya; Yanaihara, Hitoshi; Horinaga, Minoru; Asakura, Hirotaka

2013-01-01

287

An unusual oviraptorosaurian dinosaur from China  

Microsoft Academic Search

Oviraptorosaurians are an unusual group of theropod dinosaurs, with highly specialized skulls. Here we report a new oviraptorosaurian, Incisivosaurus gauthieri, gen. et sp. nov., from the lowest part of the Lower Cretaceous Yixian Formation of China. This oviraptorosaurian displays a number of characters closer to more typical theropods, such as a low skull and toothed jaws, thus greatly reducing the

Xing Xu; Yen-Nien Cheng; Xiao-Lin Wang; Chun-Hsiang Chang

2002-01-01

288

Rhabdomyosarcoma relapse in an unusual site.  

PubMed

Lower genitourinary tract rhabdomyosarcoma is the most common soft tissue sarcoma in children. Recurrence is common but usually occurs at the original site. A case of a young boy with recurrent rhabdomyosarcoma at an unusual site (glans penis) is presented. PMID:15843936

Montgomery, David A; Azmy, Amir F

2005-07-01

289

Rhabdomyosarcoma relapse in an unusual site  

Microsoft Academic Search

Lower genitourinary tract rhabdomyosarcoma is the most common soft tissue sarcoma in children. Recurrence is common but usually\\u000a occurs at the original site. A case of a young boy with recurrent rhabdomyosarcoma at an unusual site (glans penis) is presented.

David A. Montgomery; Amir F. Azmy

2005-01-01

290

Unusual sites of hydatid cysts in India.  

PubMed

Hydatid disease usually affects liver and lungs, but may affect any organ, posing a diagnostic and therapeutic dilemma. We analysed 110 patients with hydatid cyst over 21 years in our general surgical unit, which included 24 cases in unusual sites. The spleen was the most common, followed by skin and soft tissues. PMID:16354481

Khanna, A K; Prasanna, G Venkateshwar; Khanna, Rahul; Khanna, Anuradha

2005-10-01

291

On the merits of ``Unusual Field Trips''  

NASA Astrophysics Data System (ADS)

This note is a synopsis of an ``unusual field trip'' (as it is categorized by our county's office of risk management) taken by a group of physics students to New Mexico during their 1998 spring break. On our four-day trip we visited points of scientific interest related to the Manhattan Project and astronomy.

Howarth, Dean E.

1999-11-01

292

An unusual cause of toe necrosis  

PubMed Central

Peripheral vascular disease is a rare feature of pheochromocytoma. This potentially catastrophic but curable tumor should be suspected in combination of distal necrosis with hypertension and palpable pulses. We report such an unusual case of pheochromocytoma presenting as toe necrosis. PMID:23776872

Bandawar, Mayur S.; Ansari, Mohammad S.; Behera, Arunanshu; Bhadada, Sanjay K.

2013-01-01

293

Cranial computed tomography scan findings in head trauma patients in Enugu, Nigeria  

PubMed Central

Background: The choice of radiological investigations in head trauma in Africa is influenced by factors such as cost. Some patients who require computed tomography (CT) scan elsewhere are either managed blindly or do not present for it at the appropriate time. This paper evaluates the CT scan findings as they are obtained in cases of head trauma in a region of Nigeria. Methods: Prospectively recorded data of all head injury patients who presented for CT scan between January 2009 and April 2010 at Memfys Hospital for Neurosurgery (MHN), Enugu, Nigeria, were analyzed. Mobile CereTom 8-Slice CT was used in all cases. New and follow-up cases were included. Results: There were 204 CT scans for head trauma (171 new, 33 follow-up), accounting for about 34% of all head CT scans performed with this unit. The male to female ratio was 3.5:1. About 33.9% of the patients were in the third and fourth decades of life. In 19.9% cases, CT was unremarkable, while 80.1% cases had abnormal CT findings. The CT diagnosis was not in keeping with the indication of head trauma in 7%, and 13% had more than one finding. The most common CT findings were: subdural hematoma 30%, cerebral contusions and edema 30.7%, skull fractures 23.4% and extradural hematoma 8.0%. About 64% of the CT findings required surgical interventions. The overall mortality was 11.1%, but amongst the 137 patients who had abnormal CT findings, it was 13.9%. Conclusion: The high yield and diversity of CT scan findings in head trauma patients support the indication for the appropriate use of CT in diagnosis and management of head trauma even in developing countries. PMID:22276236

Ohaegbulam, Samuel C.; Mezue, Wilfred C.; Ndubuisi, Chika A.; Erechukwu, Uwadiegwu A.; Ani, Chinenye O.

2011-01-01

294

Incidentally detected grade 3 cystocele on FDG PET/CT in a case of suspected malignancy.  

PubMed

Unexpected findings are seen on FDG PET/CT outside the primary site of abnormality. Such incidental findings are common in the genitourinary tract due to normal urinary excretion of FDG. We report a case of incidentally detected grade 3 cystocele in a patient who underwent FDG PET/CT study for a suspected lung malignancy. PMID:24019662

Puranik, Ameya D; Purandare, Nilendu C; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2012-10-01

295

Incidentally detected grade 3 cystocele on FDG PET/CT in a case of suspected malignancy  

PubMed Central

Unexpected findings are seen on FDG PET/CT outside the primary site of abnormality. Such incidental findings are common in the genitourinary tract due to normal urinary excretion of FDG. We report a case of incidentally detected grade 3 cystocele in a patient who underwent FDG PET/CT study for a suspected lung malignancy. PMID:24019662

Puranik, Ameya D; Purandare, Nilendu C; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2012-01-01

296

CT Colonography (Virtual Colonoscopy)  

MedlinePLUS

... loaf of bread by cutting the loaf into thin slices. When the image slices are reassembled by computer software, the result is a very detailed multidimensional view of the body's interior. Refinements in detector technology allow new CT scanners to obtain multiple slices ...

297

CT Angiography (CTA)  

MedlinePLUS

... verifies that the images are of high enough quality for accurate interpretation. Following the exam, the intravenous catheter will be removed. A bandage will be placed over the needle puncture site. The entire CT angiography exam may be completed within a few ...

298

Dedicated breast CT  

NASA Astrophysics Data System (ADS)

Dedicated breast computed tomography (CT) systems were designed and fabricated in our laboratory, and patient scanning commenced in November 2004. The breast CT scanner was designed utilizing several off-the-shelf components, including the x-ray system, the flat-panel detector, and a position encoder - bearing - motor system. These components were integrated into a custom designed scanner frame and gantry. The breast CT scanners utilize a 17 second acquisition during patient breath-hold, and during this time 500 projection images are acquired over 360 degrees around the breast. The radiation levels are adjusted such that the mean glandular dose is equal to that of two-view mammography for each woman. As of November 2008, over 180 patients have been scanned. Of these, about 40 were imaged with and without contrast agent injection. We have also imaged 4 patients using an integrated PET system. Initial evaluation indicates that high-quality tomographic images of the breast can be achieved at dose levels comparable to two view mammography. The ultimate utility of breast CT may include breast cancer screening, diagnostic imaging, robotically controlled biopsy, and other interventional procedures.

Boone, John

2009-03-01

299

Spiral CT: thoracic applications  

Microsoft Academic Search

Volumetric CT data acquisition has had a major impact on the practice of computed tomography. This article reviews the current state of knowledge of the applications of this technique to the chest diseases, summarising its clinical impact on the assessment of lung and airways diseases, mediastinal abnormalities (excluding vascular disorders which are covered elsewhere), and in the evaluation of lung

Anwar R Padhani

1998-01-01

300

Thoracic endometriosis syndrome: CT and MRI features.  

PubMed

Thoracic endometriosis is considered to be rare, but is the most frequent form of extra-abdominopelvic endometriosis. Thoracic endometriosis syndrome affects women of reproductive age. Diagnosis is mainly based on clinical findings, which can include catamenial pneumothorax and haemothorax, non-catamenial endometriosis-related pneumothorax, catamenial haemoptysis, lung nodules, and isolated catamenial chest pain. Symptoms are typically cyclical and recurrent, with a right-sided predominance. Computed tomography (CT) is the first-line imaging method, but is poorly specific; therefore, its main role is to rule out other pulmonary diseases. However, in women with a typical clinical history, some key CT findings may help to confirm this often under-diagnosed syndrome. MRI can also assist with the diagnosis, by showing signal changes typical of haemorrhage within diaphragmatic or pleural lesions. PMID:24331768

Rousset, P; Rousset-Jablonski, C; Alifano, M; Mansuet-Lupo, A; Buy, J-N; Revel, M-P

2014-03-01

301

Xanthogranulomatous pyelonephritis in childhood: ultrasound and CT diagnosis.  

PubMed

Four cases of diffuse xanthogranulomatous pyelonephritis (XPN) in young children are presented. In three patients the clinical picture was one of weight loss, anaemia and neutrophilia with a large renal mass. The fourth presented with haematuria. Ultrasound (US) and CT findings were almost identical in all four patients. US showed the affected kidney was massively enlarged but retained a reniform shape. Dilated fluid spaces containing calculi were present. CT confirmed the US findings and revealed peripheral enhancement without contrast excretion, with dilated calyceal spaces producing the "bear paw sign". Extrarenal extension into abdominal wall and psoas muscle is typical and was well demonstrated by CT. The affected kidneys were non-functioning and nephrectomy was required. Typical US and CT features allow a confident diagnosis of XPN and appropriate early treatment. PMID:7936802

Cousins, C; Somers, J; Broderick, N; Rance, C; Shaw, D

1994-01-01

302

Neuroradiologic Findings in Children with Mitochondrial Disorders  

Microsoft Academic Search

PURPOSE: We report the neuroradiologic findings in 25 children with various mitochondrial diseases. METHODS: Twenty-two children with a mitochondrial disorder had MR imaging of the brain and three children had CT studies. In all cases, the diagnosis was based on examination of muscle morphology, analysis of oxygen consumption and respiratory chain enzyme activity in isolated muscle mitochondria, and analysis of

Leena Valanne; Leena Ketonen; Anna Majander; Anu Suomalainen; Helena Pihko

303

Imaging findings of biliary hamartomas  

PubMed Central

AIM: To evaluate the imaging findings of biliary hamartomas (von Meyenburg complexes, VMCs) and discuss the differential diagnosis with other related diseases. METHODS: Imaging findings of biliary hamartomas on ultrasonography (US), computed tomography (CT), magnetic resonance imaging (MRI), MR cholangiopancreatography (MRCP)and hepatobiliary scintigraphy were retrospectively analyzed in six patients. RESULTS: On ultrasound images, five of the six cases showed multiple small hyper- and hypo-echoic lesions with comet-tail echoes, especially when magnified by US with the usage of zoom function. In all the six cases, multiple tiny hypodense lesions less than 10 mm in diameter were revealed as scattered throughout the liver with no enhancement on CT. These tiny lesions were demonstrated to be hyper- and hypo-intensity on T2- and TI-weighed images, respectively, in three patients who underwent MRI examinations. MRCP was performed in two patients, and clearly showed multiple tiny irregular- and round-shaped hyper-intensity lesions. MRCP and hepatobiliary scintigraphy showed normal appearances of intra- and extra-hepatic bile ducts in two and one patients, respectively. CONCLUSION: Imaging modalities are useful in the diagnosis and differential diagnosis of VMCs. A correct diagnosis might be obtained when typical imaging findings are present even without a histological confirmation. PMID:16419165

Zheng, Rong-Qin; Zhang, Bo; Kudo, Masatoshi; Onda, Hirokazu; Inoue, Tatsuo

2005-01-01

304

A case report of osteochondroma with unusual clinical and imaging presentation.  

PubMed

Osteochondroma or exostosis is a bony developmental anomaly, which arises from exophytic outgrowth on bone surfaces in a characteristic manner. Osteochondroma is asymptomatic and grows away from the nearby joint. This paper reports an unusual presentation of osteochondroma in which the patient was surprisingly completely symptomatic. The lesion grew toward the nearby joint and the radiographic findings were not compatible with surgical findings. PMID:25625108

Javdan, Mohammad; Hekmatnia, Ali; Ghazavi, Amirhossein; Basiratnia, Reza; Mehrzad, Mansour; Hekmatnia, Farzaneh; Ahrar, Hossein

2015-01-01

305

A case report of osteochondroma with unusual clinical and imaging presentation  

PubMed Central

Osteochondroma or exostosis is a bony developmental anomaly, which arises from exophytic outgrowth on bone surfaces in a characteristic manner. Osteochondroma is asymptomatic and grows away from the nearby joint. This paper reports an unusual presentation of osteochondroma in which the patient was surprisingly completely symptomatic. The lesion grew toward the nearby joint and the radiographic findings were not compatible with surgical findings PMID:25625108

Javdan, Mohammad; Hekmatnia, Ali; Ghazavi, Amirhossein; Basiratnia, Reza; Mehrzad, Mansour; Hekmatnia, Farzaneh; Ahrar, Hossein

2015-01-01

306

Pitfalls in PET/CT imaging  

NASA Astrophysics Data System (ADS)

PET with 2-[fluorine 18] fluoro-2-deoxy-d-glucose (FDG), has been a clinical tool for the evaluation of various cancers providing valuable metabolic information clinically helpful in the diagnosis, initial staging, therapy monitoring and restaging. However, FDG is not specific for neoplastic processes. Unless anatomic correlation is available to delineate normal structures, pathologic sites of FDG accumulation can easily be confused with normal physiological uptake, leading to false-positive or false-negative findings. Coregistration of PET scans (functional and morphologic information) with computed tomographic (CT) scans (anatomic information) using a combined PET-CT scanner improves the overall sensitivity and specificity of information provided by PET or CT alone. In this paper, we discuss the probable causes of false negative images and pitfalls due to technical reasons, inflammatory processes or benign lesions as well as the utility of PET-CT in differentiating malignant from inflammatory and benign processes, since in some cases such differentiation cannot be made, with certainty, using FDG PET alone.

Rondogianni, Ph; Papathanasiou, N.; Giannopoulou, Ch

2011-09-01

307

Unusual lung tumours: an illustrated review of CT features suggestive of this diagnosis  

PubMed Central

This review presents an imaging-centred approach to the diagnostic challenge of uncommon lung tumours in adults. Emphasis is placed on features that may be used to differentiate these tumours including fat content, tumour site, multifocality, calcification and predominant pattern of involvement. PMID:16829468

Bhatia, K; Ellis, S

2006-01-01

308

[Rare or unusual forms of psoriasis].  

PubMed

Apart from plaque-type psoriasis, there are multiple particular or rare clinical presentations, according to signs and symptoms, localization or distribution of lesions. Psoriasis can affect mucous membranes, especially the genital areas of male and female patients, causing pain or burning sensation and decreased quality of life. Geographic tongue is not specific of psoriasis, but is more frequent in this context. Other localizations like the lips and the eylids are rare, but should not be overlooked. Certain lesions have an unusual distribution, like psoriasis gyrata and blaschko linear forms. Pustules are frequently observed on the palms and soles. Acrodermatitis continua is a rare chronic pustular condition affecting the acral areas, mainly the fingers, which is associated with severe nail involvement. Nails can also be involved in the unusual pachydermo-periostitis, a clinical form of psoriasis without epidermal lesions, which has characteristic radiologic presentation. PMID:22541727

Cribier, B

2012-04-01

309

Unusual causes of papilledema: Two illustrative cases  

PubMed Central

Background: Neurosurgeons are frequently among the first physicians asked to evaluate patients with papilledema, and the patient is often referred with the implication that they may require shunting. After an initial evaluation to exclude potential neurosurgical emergencies, the physician should carefully consider various etiologies of papilledema to prevent unnecessary neurosurgical operations. Case Description: The authors report two illustrative cases of unusual causes of papilledema: Anemia and leukemic infiltration of the central nervous system. In each case, a complete blood count provided clues for the diagnosis. A review of the literature is also included. Conclusions: Both patients responded to medical management/treatment of the underlying disease and did not require neurosurgical operative intervention. Papilledema may be caused by other etiologies besides increased intracranial pressure. The authors present two unusual cases leading to papilledema and provide an outline for the workup of these conditions. PMID:23646270

Nguyen, Ha Son; Haider, Kathryn M.; Ackerman, Laurie L.

2013-01-01

310

Evaluation of the Circle of Willis with Three-dimensional CT Angiography in Patients with Suspected Intracranial Aneurysms  

Microsoft Academic Search

PURPOSE: To determine the usefulness of CT angiography in the setting of suspected acute subarachnoid hemorrhage or intracranial aneurysm. METHODS: We prospectively studied 68 patients suspected of having subarachnoid hemorrhage or an intracranial aneurysm with noncon- trast CT of the head followed immediately by contrast-enhanced helical CT of the circle of Willis with three-dimensional reconstruction. Twenty-seven patients with CT findings

Ronald A. Alberico; Mahendra Patel; Sean Casey; Betsy Jacobs; William Maguire; Robert Decker

311

Segmental lichen planus pigmentosus: An unusual presentation  

PubMed Central

Lichen planus pigmentosus (LPP) is a distinct clinical entity commonly encountered in the Indian population. It is considered a variant of lichen planus (LP). A 40-year-old male presented with asymptomatic hyperpigmented macules in a segmental distribution since 10 years that were clinically and histopathologically suggestive of LPP. We propose the terminology “segmental lichen planus pigmentosus” and report this unusual presentation. PMID:24860750

Kumar, Y Hari Kishan; Babu, Anagha Ramesh

2014-01-01

312

Unusual Case of ALL with Ovarian Relapse.  

PubMed

Patients with acute lymphoblastic leukemia (ALL) can develop relapse in sanctuary sites like brain, ovary or testis even when the bone marrow is in remission. Pelvic recurrence is rarely reported during the follow up of successfully treated ALL in females. We report here a very unusual case of a large pelvic lump which the patient herself could feel, that was probably an ovarian relapse of ALL, successfully treated with re-induction chemotherapy alone and achieved complete remission. PMID:25548463

Sasidharan, P K; Sugeeth, M; Abdul Majeed, P; Shaan, Mohamed; Hitha, B

2015-03-01

313

Spectroscopy of asteroids in unusual orbits  

NASA Technical Reports Server (NTRS)

Medium-resolution spectroscopy of a collection of nonmain-belt asteroids has been obtained in order to search for possible cometlike spectral features. The asteroids include nine earth approachers, two Trojans, and the unusual object 2060 Chiron. All spectra were obtained and reduced in the same manner as comet data in the McDonald Observatory Faint Comet Survey. No indication of cometary activity was found in any of the asteroids observed.

Cochran, W. D.; Cochran, A. L.; Barker, E. S.

1986-01-01

314

Unusual presentation of NOMA: a case report.  

PubMed

A case of noma with involvement of other parts of the body from extension and spread of cancrum lesion in the oral cavity and primary herpetic stomatitis in a two-year-old male patient is reported. The possible routes of infection to other parts of the body are discussed. It is expected that this case report will stimulate the awareness of health practitioners to this unusual presentation of cancrum oris. PMID:15259930

Fasola, A O; Obiechina, A E; Arotiba, J T

2003-12-01

315

[A man with unusual abdominal gas].  

PubMed

A 34 year old male was admitted to our hospital with a severe pancreatitis. On a CT scan we diagnosed a developing emphysematous pancreatitis. This is a rare form of pancreatitis usually caused by an infection with an Escherichia coli. PMID:21429258

de Jager, Corine M; Buis, Carlijn I

2010-01-01

316

Necrobiosis lipoidica with elastophagocytosis on an unusual location.  

PubMed

Necrobiosis lipoidica (NL) is a granulomatous disease of collagen degeneration classically affecting the lower extremities. Elastophagocytosis is a histological finding, whereby multinucleate macrophages demonstrate phagocytosis of elastic fibers commonly associated with sun-damaged skin. Elastophagocytosis is not typically described in NL. The authors present a patient who presented with reddish-yellow plaques on both his forearms. Skin biopsy revealed extensive palisaded granulomas consistent with NL and features of elastophagocytosis in the upper dermis. The unusual site of presentation is a diagnostic pitfall, further complicated by the histological features of elastophagocytosis, for which the differential diagnosis of actinic granuloma needs to be considered. This case highlights the importance of clinicopathological correlation to arrive at a definitive diagnosis in situations where unexpected features on physical examination and histology may confound the clinical picture. PMID:24786578

Tee, Shang-Ian; Chen, Qi Ping; Lim, Yen Loo

2014-09-01

317

Chest CT Features of North American Paragonimiasis  

PubMed Central

OBJECTIVE The purpose of this study was to characterize the chest CT findings of North American paragonimiasis due to Paragonimus kellicotti in the largest (to our knowledge) case series reported to date and to compare the findings with those reported for paragonimiasis infections in other regions. MATERIALS AND METHODS A retrospective review was performed of chest CT examinations of eight patients with North American paragonimiasis treated at our institution between 2006 and 2010. Findings were characterized by site of involvement, including lungs and pleura, heart and pericardium, lymph nodes, and upper abdomen. RESULTS The most common chest CT findings in this case series were pleural effusions and internal mammary and cardiophrenic lymphadenopathy. Pulmonary parenchymal findings included peripheral lung nodules of 1–3.5 cm in size with surrounding ground-glass opacity; many nodules had a linear track to the pleural surface that may correspond to the worm’s burrow tunnel. Pericardial involvement (5/8 patients) and omental inflammation (5/7 patients), which are uncommon in Asian paragonimiasis, were common in this series. CONCLUSION Pleural and pulmonary features of North American paragonimiasis are generally similar to those reported from Asia. The presence of a track between a pulmonary nodule and the pleura may help distinguish paragonimiasis from mimickers, including chronic eosinophilic pneumonia, tuberculosis, fungal infection, or malignancy. Pericarditis, lymphadenopathy, and omental inflammation were more common in our series than in reports on paragonimiasis from other regions. These differences may be related to the infecting parasite species or to the fact that radiologic examinations in the present series were performed relatively early in the course of infection. PMID:22528896

Henry, Travis S.; Lane, Michael A.; Weil, Gary J.; Bailey, Thomas C.; Bhalla, Sanjeev

2013-01-01

318

Evaluation of unusual neuroendocrine tumours by means of 68Ga-DOTA-NOC PET.  

PubMed

(18)F-FDG PET value for the assessment of neuroendocrine tumours (NET) is limited. Preliminary studies indicate that somatostatin receptor PET using (68)Ga-DOTA-peptides is more accurate for disease assessment and provide additional data on receptor status, that are crucial for targeted radionuclide therapy. At present, however, few papers investigated the role of (68)Ga-DOTA-NOC PET in NET, especially in unusual situations. The purpose of the present study was to evaluate (68)Ga-DOTA-NOC for the evaluation of NET of uncommon presentation. Patients with biopsy-proven NET were scheduled for (68)Ga-DOTA-NOC PET; we excluded from further evaluation cases with most common NET tumours (gastro-entero-pancreatic and pulmonary localization of primary lesion, MEN syndromes, medullary thyroid carcinoma, pheochromocytomas). PET results were compared with findings of conventional imaging, including CT, ultrasonography, MR and somatostatin receptor scintigraphy; finally PET results were compared with follow-up data with respect to the impact on patient management. Fourteen patients were finally enrolled; primary tumours were located at uterine level (3 cases), prostate (3 cases), ovary (1 case), kidney (1 case), breast (1 case), ear (1 case); also 3 cases of paraganglioma (at neck, abdominal and mediastinum level) and 1 case of lymphoma were included. (68)Ga-DOTA-NOC PET was positive, showing at least 1 lesion, in 6/14 cases while 5 cases turned out negative and 2 inconclusive. On a clinical basis, (68)Ga-DOTA-NOC provided additional information in comparison to conventional imaging procedures in 7/14 cases, and was considered useful in 12/14 patients, with 8 patients in which (68)Ga-DOTA-NOC PET was determinant for patient's management. Although the number of patients studied is limited, our data show that (68)Ga-DOTA-NOC can be usefully applied for the evaluation of NET of uncommon presentation; in particular very promising results were obtained in paraganglioma. On the other hand, care has to be paid when studying lesions localized at sites of physiological concentration of the tracer, and in presence of inflammation. PMID:18358680

Fanti, Stefano; Ambrosini, Valentina; Tomassetti, Paola; Castellucci, Paolo; Montini, Giancarlo; Allegri, Vincenzo; Grassetto, Gaia; Rubello, Domenico; Nanni, Cristina; Franchi, Roberto

2008-12-01

319

Renal malignant solitary fibrous tumor with single lymph node involvement: report of unusual metastasis and review of the literature  

PubMed Central

Solitary fibrous tumors are rare mesenchymal spindle cell neoplasms that are usually found in the pleura. The kidneys are an uncommon site and only few cases of renal solitary fibrous tumor exhibit malignant behavior metastasizing to the liver, lung, and bone through the hematogenous pathway. Purpose To describe the first case of lymph node metastasis from renal solitary fibrous tumor in order to increase the knowledge about the malignant behavior of these tumors. Patients and methods A 19-year-old female patient had intermittent hematuria for several months without flank pain or other symptoms. A chest and abdomen CT scan was performed and showed a multi-lobed bulky solid mass of 170 × 98 × 120 mm in the left kidney. One day before the surgery, the left renal artery was catheterized and the kidney embolization was performed using a Haemostatic Absorbable Gelatin Sponge and polyvinyl alcohol. We then performed a radical nephrectomy with hilar, para-aortic, and inter-aortocaval lymphadenectomy. Results Estimated intraoperative blood loss was 200 mL and the operative time was 100 minutes. No postoperative complications occurred. The hospital stay was 7 days long. The histological examination was malignant solitary fibrous tumor of the kidney. Cancerous tissue showed cellular atypia, with an increased mitotic index (up to 7 × 10 hpf). Immunohistochemical analysis showed positive results for CD34, BCL2, partial expression of HBME1, and occasionally of synaptophysin. Histological evaluation confirmed the presence of metastasis in one hilar node. The patient did not receive any other therapy. At 30-month follow-up, the patient was in good health and no local recurrence or metastases had occurred. Conclusion This is the first case of lymph node metastasis from a renal solitary fibrous tumor showing unusual malignant behavior; this finding adds new information about the biology and progression of these tumors, which remain unclear. PMID:24855378

Mearini, Ettore; Cochetti, Giovanni; Barillaro, Francesco; Fatigoni, Sonia; Roila, Fausto

2014-01-01

320

CT number variations in micro CT imaging systems  

NASA Astrophysics Data System (ADS)

CT numbers can be directly computed from the linear attenuation coefficients in the reconstructed CT images and are correlated to the electron densities of the chemical elements with specific atomic numbers. However, the computed CT numbers can be varied when different imaging parameters are used. Phantoms composed of clinically relevant and tissue-equivalent materials (lung, bone, muscle, and adipose) were scanned with a commercial circular-scanning micro CT imager. This imaging system is composed with a micro-focused x-ray tube and charged-coupled device (CCD) camera as the detector. The mean CT numbers and the corresponding standard deviations in terms of Hounsfield units were then computed from a pre-defined region of interest located within the reconstructed volumetric images. The variations of CT number were then identified from a series of imaging parameters. Those parameters include imaging acquisition modes (e.g., the metal filter used in the x-ray tube), reconstruction methods (e.g., Feldkamp and iterative algorithm), and post-image processing techniques (e.g., ring artifact, beam-hardening artifact, and smoothing processing). These variations of CT numbers are useful and important in tissue characterization, quantitative bone structure analysis, bone marrow density evaluation, and Monte Carlo dose calculations for the pilot small animal study when micro CT imaging systems are employed. Also these variations can be used as the quantification for the performance of the micro CT imaging systems.

Tu, Shu-Ju; Hsieh, Hui-Ling; Chao, Tsi-Chian

2008-03-01

321

CT versus FDG-PET/CT response evaluation in patients with metastatic colorectal cancer treated with irinotecan and cetuximab  

PubMed Central

We compared morphologic computed tomography (CT)-based to metabolic fluoro-deoxy-glucose (FDG) positron emission tomography (PET)/CT-based response evaluation in patients with metastatic colorectal cancer and correlated the findings with survival and KRAS status. From 2006 to 2009, patients were included in a phase II trial and treated with cetuximab and irinotecan every second week. They underwent FDG-PET/CT examination at baseline and after every fourth treatment cycle. Response evaluation was performed prospectively according to Response Evaluation Criteria in Solid Tumors (RECIST 1.0) and retrospectively according to Positron Emission Tomography Response Criteria in Solid Tumors (PERCIST). Best overall responses were registered. Sixty-one patients were eligible for response evaluation. Partial response (PR) rate was 18%, stable disease (SD) rate 64%, and progressive disease (PD) rate 18%. Partial metabolic response (PMR) rate was 56%, stable metabolic disease rate 33%, and progressive metabolic disease (PMD) rate 11%. Response agreement was poor, ?-coefficient 0.19. Hazard ratio for overall survival for responders (PR/PMR) versus nonresponders (PD/PMD) was higher for CT- than for FDG-PET/CT evaluation. Within patients with KRAS mutations, none had PR but 44% had PMR. In conclusion, morphologic and metabolic response agreement was poor primarily because a large part of the patients shifted from SD with CT evaluation to PMR when evaluated with FDG-PET/CT. Furthermore, a larger fraction of the patients with KRAS mutations had a metabolic treatment response. PMID:24941936

Skougaard, Kristin; Johannesen, Helle Hjorth; Nielsen, Dorte; Schou, Jakob Vasehus; Jensen, Benny Vittrup; Høgdall, Estrid V S; Hendel, Helle Westergren

2014-01-01

322

Parenchymal liver enhancement with bolus-triggered helical CT: preliminary clinical results.  

PubMed

A software-driven device for bolus-triggered start of helical computed tomography (CT) was evaluated in liver studies of 30 patients with suspected metastatic liver disease. Compared with results in a control group of 30 patients who underwent conventional contrast material-enhanced helical CT, the study group had significantly higher and more constant parenchymal enhancement (P < .05, Mann-Whitney U test). This technique helps optimize findings at contrast-enhanced helical CT. PMID:7892486

Kopka, L; Funke, M; Fischer, U; Vosshenrich, R; Oestmann, J W; Grabbe, E

1995-04-01

323

Pictorial essay: CT scan of appendicitis and its mimics causing right lower quadrant pain  

PubMed Central

CT scanning is widely used in the diagnostic workup of right lower quadrant pain. While appendicitis remains the most frequent cause, a majority of patients referred for suspected appendicitis turn out to have alternative diagnoses or a normal CT study. The purpose of our pictorial essay is to present an overview of the CT findings of appendicitis and its common mimics and to highlight the features that provide clues to alternative diagnoses.

Sharma, Monika; Agrawal, Anjali

2008-01-01

324

Chronic osteomyelitis examined by CT  

SciTech Connect

CT examination of 25 patients who had acute exacerbations of chronic osteomyelitis allowed for the correct identification of single or multiple sequestra in 14 surgical patients. Plain radiographs were equivocal for sequestra in seven of these patients, because the sequestra were too small or because diffuse bony sclerosis was present. CT also demonstrated a foreign body and five soft tissue abscesses not suspected on the basis of plain radiographs. CT studies, which helped guide the operative approach, were also useful in treating those patients whose plain radiographs were positive for sequestra. The authors review the potential role of CT in evaluating patients with chronic osteomyelitis.

Wing, V.W.; Jeffrey, R.B. Jr.; Federle, M.P.; Helms, C.A.; Trafton, P.

1985-01-01

325

Prediction of outcome in patients with suspected acute ischaemic stroke with CT perfusion and CT angiography: the Dutch acute stroke trial (DUST) study protocol  

PubMed Central

Background Prediction of clinical outcome in the acute stage of ischaemic stroke can be difficult when based on patient characteristics, clinical findings and on non-contrast CT. CT perfusion and CT angiography may provide additional prognostic information and guide treatment in the early stage. We present the study protocol of the Dutch acute Stroke Trial (DUST). The DUST aims to assess the prognostic value of CT perfusion and CT angiography in predicting stroke outcome, in addition to patient characteristics and non-contrast CT. For this purpose, individualised prediction models for clinical outcome after stroke based on the best predictors from patient characteristics and CT imaging will be developed and validated. Methods/design The DUST is a prospective multi-centre cohort study in 1500 patients with suspected acute ischaemic stroke. All patients undergo non-contrast CT, CT perfusion and CT angiography within 9 hours after onset of the neurological deficits, and, if possible, follow-up imaging after 3 days. The primary outcome is a dichotomised score on the modified Rankin Scale, assessed at 90 days. A score of 0–2 represents good outcome, and a score of 3–6 represents poor outcome. Three logistic regression models will be developed, including patient characteristics and non-contrast CT (model A), with addition of CT angiography (model B), and CT perfusion parameters (model C). Model derivation will be performed in 60% of the study population, and model validation in the remaining 40% of the patients. Additional prognostic value of the models will be determined with the area under the curve (AUC) from the receiver operating characteristic (ROC) curve, calibration plots, assessment of goodness-of-fit, and likelihood ratio tests. Discussion This study will provide insight in the added prognostic value of CTP and CTA parameters in outcome prediction of acute stroke patients. The prediction models that will be developed in this study may help guide future treatment decisions in the acute stage of ischaemic stroke. PMID:24568540

2014-01-01

326

Etanercept-Induced Sarcoidosis in Rheumatoid Arthritis: FDG PET Findings.  

PubMed

We report the F-FDG PET/CT findings of an etanercept-induced sarcoidosis in a patient with rheumatoid arthritis. A 68-year-old woman with rheumatoid arthritis who had been treated with etanercept and methotrexate showed multiple lung nodules and hilar lymph node swellings on CT. She underwent FDG PET/CT for cancer screening. Intense FDG uptakes were found in the multiple lung nodules, bilateral hilar lymph nodes, a periurethral masslike lesion, and cranial meningeal nodules. A histopathological examination revealed epithelioid granuloma with multinucleated giant cells, which was compatible with sarcoidosis. PMID:25188646

Nakajima, Reiko; Abe, Koichiro; Nakajima, Ayako; Nishikawa, Toshio; Sakai, Shuji

2015-01-01

327

Unusual dermoid cyst in oral cavity.  

PubMed

Dermoid cysts in oral cavity are unusual lesions. Their etiology is not yet clear and can be associated with trapped cells as a result of the inclusion error resulting in the development into the ectoderm, mesoderm, and endoderm tissues. The aim of this case report is to evidence the presence of a dermoid cyst in the floor of mouth surgically removed. In the present case, the lesion showed soft consistency, floating, regular borders, smooth surface, and the same color as the adjacent mucosa, asymptomatic and measuring 4.5?×?5.5?cm in its greatest diameter. The initial diagnostic was ranula in consequence of the similarity with clinical characteristics and localization. After surgical removal lesion, a fibrotic capsule was identified with a friable material with intensive yellow color. The microscopic exam showed cystic lesion with cavity lined by squamous stratified epithelium hyperorthokeratinized. Cutaneous attachments, such as sebaceous glands and hair follicles, were present in connective adjacent tissue. Surgical intervention is elective in these situations. All dentists must have a thorough knowledge of this unusual lesion. PMID:24818032

Vieira, Evanice Menezes Marçal; Borges, Alvaro Henrique; Volpato, Luis Evaristo Ricci; Porto, Alessandra Nogueira; Carvalhosa, Artur Aburad; Botelho, Gilberto de Almeida; Bandeca, Matheus Coelho

2014-01-01

328

Relapsing polychondritis in childhood: A rare observation studied by CT and MRI  

Microsoft Academic Search

Relapsing polychondritis is very rare in children. The diagnosis must be based on a combination of clinical and pathologic features. CT is very useful for an accurate and rapid assessment of laryngo-tracheo-bronchial involvement and the typical finding is lumen narrowing by wall thickening and collapse of the supporting cartilaginous structures. The role of MR imaging should be complementary to CT.

M. Oddone; P. Tomà; A. Taccone; G. Hanau; A. Delogu; G. Gemme

1992-01-01

329

CT appearance of acute radiation-induced injury in the lung  

Microsoft Academic Search

To determine how soon radiation-induced lung injury is detectable, to compare the CT findings with those on chest radiographs, and to observe the appearance of the abnormality during the acute phase, we performed 83 CT studies in 17 radiotherapy patients at relatively short intervals. All 17 patients received fractionated radiotherapy to the thorax with a large irradiated lung volume. The

Junpei Ikezoe; Shodayu Takashima; S. Morimoto; Koichi Kadowaki; N. Takeuchi; T. Yamamoto; K. Nakanishi; M. Isaza; J. Arisawa; H. Ikeda

1988-01-01

330

Quantifying tumour heterogeneity with CT  

PubMed Central

Abstract Heterogeneity is a key feature of malignancy associated with adverse tumour biology. Quantifying heterogeneity could provide a useful non-invasive imaging biomarker. Heterogeneity on computed tomography (CT) can be quantified using texture analysis which extracts spatial information from CT images (unenhanced, contrast-enhanced and derived images such as CT perfusion) that may not be perceptible to the naked eye. The main components of texture analysis can be categorized into image transformation and quantification. Image transformation filters the conventional image into its basic components (spatial, frequency, etc.) to produce derived subimages. Texture quantification techniques include structural-, model- (fractal dimensions), statistical- and frequency-based methods. The underlying tumour biology that CT texture analysis may reflect includes (but is not limited to) tumour hypoxia and angiogenesis. Emerging studies show that CT texture analysis has the potential to be a useful adjunct in clinical oncologic imaging, providing important information about tumour characterization, prognosis and treatment prediction and response. PMID:23545171

Miles, Kenneth A.

2013-01-01

331

Unusual ocular findings in an infant with cri-du-chat syndrome  

Microsoft Academic Search

A newborn male with cri-du-chat syndrome, congenital nuclear cataracts, microspherophakia, and probably ectopic lenses is reported. Microspherophakia in cri-du-chat syndrome has not been previously described. The congenital cataracts were inherited from his mother who had a balanced 5;13 translocation; the two events are considered to be coincidental and a possible 'position effect' was excluded, since the other members of her

S Kitsiou-Tzeli; H D Dellagrammaticas; C B Papas; I D Ladas; C S Bartsocas

1983-01-01

332

FINFISH HEALTH IN THE UNITED STATES (1797 TO 1920): PIONEERING INVESTIGATORS, EARLY FINDINGS AND UNUSUAL TREATMENTS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Several notable men set the stage for the development and growth of fish health in the United States including: White House surveyor, Benjamin H. Latrobe, world renowned physician and naturalist, Joseph P. Leidy, essayist, poet, and philosopher, Henry D. Thoreau, clergyman and premier fish culturist...

333

Typical MDCT Angiography Findings of an Unusual Cutaneous Neoplasia; Masson Tumor  

PubMed Central

Summary Background Intravascular papillary endothelial hyperplasia (IPEH), also known as masson tumour, is a lesion composed of proliferating endothelial cells. Case Report In this article we explained clinical, histological and radiological features of IPEH involving the scalp, localized on the left side of the skull and in the periauricular region. Conclusions Radiologically, intravascular papillary endothelial hyperplasia could be misdiagnosed as malignant or benign vascular tumour. On cross-sectional imaging it is useful demonstrating the extremely vascular component of IPEH. But IPEH has no specific radiologic features that we can use to differentiate from the aforementioned lesions. Due to that, histopathological examinations are needed to diagnose IPEH. PMID:25624958

Tutar, Onur; Samanci, Cesur; Bakan, Selim; Alis, Denizcan; Kaur, Ahmet; ?anl?, Deniz Tekcan; Yildirim, Duzgun

2015-01-01

334

Brief communication: unusual finding at Pueblo Bonito: multiple cases of hyperostosis frontalis interna.  

PubMed

Hyperostosis frontalis interna (HFI) is a disease characterized by excess bone growth on the internal lamina of the frontal bone and, occasionally, other cranial bones. Although the disease is fairly common in modern populations, its etiology is poorly understood. Hyperostosis frontalis interna has been identified in antiquity, primarily in the Old World, but with a much lower frequency than in modern groups. The purpose of the present study is to report multiple cases of HFI at Pueblo Bonito (Chaco Canyon, New Mexico). Twelve out of 37 adults with observable frontal bones exhibited HFI, ranging from mild to severe, including 11 females and one male. This is the first published case report of HFI in archaeological remains from the New World having a frequency comparable with modern groups. Most archaeological cases of HFI are isolated, so comparative data for multiple cases at one site are rare. The results of this study emphasize the importance of looking for HFI in archaeological remains, although it is rarely observed. Possible genetic and environmental factors for the high frequency of HFI at Chaco Canyon are considered, but additional research is needed to discover the etiology and to better understand why HFI sometimes occurs at modern frequencies in ancient populations. PMID:16444722

Mulhern, Dawn M; Wilczak, Cynthia A; Dudar, J Christopher

2006-08-01

335

Metastatic Renal Cell Cancer and a Gastric Mass: An Unusual Finding.  

PubMed

Renal cell cancer (RCC) accounts for approximately 3% of all adult malignancies. RCC has a metastasis rate of approximately 25%, which is most commonly to the lungs (>50%). On the contrary, RCC metastasis to the gastrointestinal tract (excluding the liver) is very uncommon and ranges from 0.2 to 0.7%. Thus, a gastric cancer in a patient with known metastatic RCC would most likely be secondary to metastasis. We present the first reported case of a metastatic RCC coexisting with a new-onset primary gastric cancer and a review of management using guidelines from metastatic RCC to the stomach. An 82-year-old African American male with papillary RCC status post left nephrectomy with recurrence of liver metastasis presented with failure to thrive shortly after his third cycle of chemotherapy despite stable disease by imaging studies. He had received 7 chemotherapy cycles of Gemzar, Nexavar, and Avastin prior to admission. He subsequently had a drop in his hemoglobin and was found to have hemoccult positive stool in the setting of recent Avastin. Endoscopic evaluation showed a 3 cm ulcerated mass in the cardia which was biopsied. The biopsy showed invasive and poorly differentiated gastric adenocarcinoma unrelated to his RCC. The patient subsequently underwent partial gastrectomy with loop gastrojejunostomy for resection of his stage 1 primary gastric adenocarcioma. The surgery also facilitated future chemotherapy (Avastin), which could not be given prior to surgery due to its side effect of bleeding. The patient did not receive adjuvant chemoradiation for his gastric cancer due to his comorbidities at the time and was doing well at a one month follow-up. Metastatic RCC and primary gastric cancer can coexist, especially when there is an overlap of risk factors such as smoking or nitrosamines. The management of a gastric cancer in the setting of metastatic RCC is similar to the management of solitary primary gastric carcinoma. Treatment of the primary gastric cancer can facilitate future chemotherapy such as Avastin, which has been recently approved for the treatment of metastatic RCC. PMID:21060712

Senadhi, Viplove; Jani, Niraj; Erlich, Rodrigo

2010-01-01

336

HOT SAX: Efficiently Finding the Most Unusual Time Series Subsequence Eamonn Keogh Jessica Lin  

E-print Network

with objective experiments on domains as diverse as Space Shuttle telemetry monitoring, medicine, surveillance anomalies in domains as diverse as Space Shuttle telemetry, industry, and medicine. One reason why discords access to huge amounts of training data, even then, avoiding overfitting remains a challenge. This paper

Fu, Ada Waichee

337

An Unusual Cause of Tree-in-Bud Pattern: Pulmonary Intravascular Tumor Embolism Caused by Chondrosarcoma.  

PubMed

We report the case of a 45-year-old man who initially presented with chondrosarcoma of the left femur that was treated surgically. Follow-up chest computed tomography (CT) performed 3 years later showed multiple small nodules with a tree-in-bud branching pattern and larger elongated opacities with beaded contours. These findings raised the suspicion of intravascular tumor embolism. Pulmonary CT angiography demonstrated intravascular thrombosis and dilated and beaded peripheral pulmonary arteries. The tumoral origin of the thrombus was confirmed by lung biopsy. PMID:25318866

Peixoto, Lilia Silva; Valiante, Paulo Marcos; Rodrigues, Rosana Souza; Barreto, Miriam Menna; Zanetti, Gláucia; Marchiori, Edson

2014-10-16

338

Levoatriocardinal Vein: An Unusual Cause of Right-to-Left Shunting  

PubMed Central

We present a case demonstrating an anomalous vessel connecting the left brachiocephalic vein and the left superior pulmonary vein, found incidentally on computed tomography (CT) imaging. This pulmonary–systemic venous connection, known as a levoatriocardinal vein, is a rare anomaly. In previous descriptions, this vessel has typically been associated with left-to-right shunt. Here, we describe the magnetic resonance imaging (MRI) and CT findings in a case with right-to-left shunting through the anomalous vessel likely secondary to elevated right cardiac pressure.

Shet, Nilima; Maldjian, Pierre

2014-01-01

339

Prenatal Diagnosis of Unusual Fetal Pial Arteriovenous Malformation  

PubMed Central

Summary Cerebral arteriovenous malformations (C-AVMs) are rarely diagnosed in utero. Most prenatal imaging of intracranial vascular malformations relates to Vein of Galen aneurysmal malformations (VGAMs) or Dural Arteriovenous Malformations (D-AVMs). We report a case of a fetal pial AVF with multiple fistulae and venous pouches, which appeared as an anechoic lesion on the prenatal ultrasound scan. The patient was asymptomatic with normal postnatal growth. No haemodynmaic disturbance was evident. Postnatal Computed tomography (CT), Magnetic Resonance Imaging (MRI) and catheter Digital Subtraction Angiography (DSA) confirmed the presence of a pial AVF. The angiographic findings and family history of nose bleeds suggests the diagnosis of Hereditary Hemorrhagic Telangiectasia. The largest AVF was embolized with tissue adhesive; the residual AVF subsequently removed by surgical excision. PMID:20591266

Auyeung, K.M.; Laughlin, S.; TerBrugge, K.G.

2003-01-01

340

CT of the chest in the evaluation of idiopathic pulmonary arterial hypertension in children  

Microsoft Academic Search

Background  Idiopathic pulmonary arterial hypertension (IPAH) is a rare disease in children. By definition it is a diagnosis of exclusion,\\u000a and CT of the chest is primarily performed to exclude other causes. Previous studies have defined CT features suggestive of\\u000a the diagnosis of IPAH, but these have all been limited to the adult population.\\u000a \\u000a \\u000a \\u000a Objective  Contrast-enhanced chest CT and high-resolution CT findings

Gulraiz Chaudry; Cathy MacDonald; Ian Adatia; Munire Gundogan; David Manson

2007-01-01

341

Dynamic volume CT: the next revolution in clinical CT  

NASA Astrophysics Data System (ADS)

The need for table motion in multi-detector CT causes image volumes acquired for whole organ motion and perfusion studies to lack temporal uniformity. The next revolution in clinical CT, dynamic volume CT, mitigates this limitation by providing the ability to acquire an entire organ with isotropic resolution in a single gantry rotation with no table movement. The first dynamic volume CT scanner has recently been introduced and comprises 320 detector rows of 0.5mm channel thickness, covering 16cm of anatomy in one rotation of 0.35sec. This scanner offers many advancements in terms of temporal uniformity, reconstruction, and radiation dose. This system significantly reduces motion artifact and eliminates contrast phase differences within the volume. Because this scanner does not require helical acquisition for volumetric imaging, it delivers significantly less dose for applications such as CT coronary angiography exams as well as reduced dose in most other applications. Furthermore, by eliminating table motion, the need for complex interpolation methods that can distort cardiac images is removed. Image quality is not sacrificed compared with standard 64-row CT scanners, as demonstrated via low contrast, resolution, and accuracy measurements presented in this work. By capturing the entire brain in one rotation, brain perfusion, bone subtraction, and quantitative perfusion analysis are now possible with a single low dose exam. Dynamic volume CT offers to change the way medicine approaches stroke patients, myocardial perfusion studies, and imaging of other moving body parts such as the lung and joints.

Boedeker, Kirsten; Mather, Rich

2008-08-01

342

[Papillary renal cell carcinoma surrounded by unusual fibrotic reaction resembling inflammatory pseudotumour--a case report].  

PubMed

Authors report clinicopathological features of an unusual case of composite renal lesion occuring in 32-year-old Caucasian male. The patient was followed for cystic lesion of retroperitoneal-renal region for 5 years. He was indicated for resection of the cystic lesion because of changes of the retroperitoneal mass on CT scan. A cyst was located on upper renal pole. A huge cystic mass filled mainly by necrotic material was resected and submitted for histological examination. The wall of the cyst was composed of fibrous tissue, indistinguishable from inflammatory pseudotumor on histological level. The vital intracystic tissue was formed by well-differentiated papillary renal cell carcinoma. The most important step within differential diagnosis is distinguishing of sarcomatoid differentiation in renal cell carcinoma. This very rare case demonstrates the importance of careful examination of all spindle cell lesions of the kidney. PMID:15493420

Hes, O; Hora, M; Havlícek, F; Chudácek, Z; Klecka, J; Michal, M

2004-07-01

343

Gallstone ileus obstructing within an incarcerated lumbar hernia: an unusual presentation of a rare diagnosis.  

PubMed

We describe an unusual case of a 74-year-old woman who presented with signs and symptoms of small-bowel obstruction and a clinically appreciable, irreducible, left-sided lumbar hernia associated with previous iliac crest bone graft harvesting. Palpation of the hernia demonstrated a small, firm mass within the loops of herniated bowel. CT scanning recognised an intraluminal gallstone at the transition point, establishing the diagnosis of gallstone ileus within an incarcerated lumbar hernia. The proposed explanatory mechanism is that of a gallstone migrating into an easily reducible hernia containing small bowel causing obstruction at the hernia neck by a ball-valve mechanism, resulting in proximal bowel dilation and thus hernia incarceration; it remains unclear when the stone entered the hernia, and whether it enlarged in situ or prior to entering the enteral tract. This is only the second reported instance in the literature of an intraluminal gallstone causing hernia incarceration. PMID:25471112

Ziesmann, Markus Tyler; Alotaiby, Nouf; Al Abbasi, Thamer; Rezende-Neto, Joao B

2014-01-01

344

Unusual case of acute tracheal injury complicated by application of positive end expiratory pressure (PEEP).  

PubMed

Blunt neck trauma can be caused by a variety of injuries such as deceleration, road traffic accidents and crush injuries. The worst scenario is airway rupture. We report an unusual case of acute tracheal injury in a 34-year-old Irish man who presented with a history of strangulation while working with a tractor. On arrival, he had one episode of mild haemoptysis and reported pain around the base of the neck and voice hoarseness. His chest X-ray revealed pneumopericardium and CT of thorax showed airway oedema. After elective intubation, positive end-expiratory pressure (PEEP) of 5?cm?H2O caused deterioration in his clinical condition with increasing surgical emphysema and rise of carbon dioxide partial pressure (PaCO2), which was completely reversed after stopping PEEP. This case shows how PEEP and intermittent positive pressure ventilation can worsen air leak and compromise stability in patients with acute tracheal injury. PMID:25398917

Farooqui, Asif Masroor; Mbarushimana, Simon; Faheem, Mohammad

2014-01-01

345

Granular cell tumour of the orbit: radiological findings  

Microsoft Academic Search

Radiological findings in four cases of intraorbital granular cell tumour are presented, and compared with those previously reported. These rare lesions often appear to involve an extraocular muscle, and are seen on CT as an enhancing mass, usually well defined, and frequently lying anteriorly. Plain films are characteristically normal; angiographic findings range from normality to a dense tumour blush.

I. Moseley

1991-01-01

346

Chandra X-Ray Observations of Two Unusual BAL Quasars  

E-print Network

We report sensitive Chandra X-ray non-detections of two unusual, luminous Iron Low-Ionization Broad Absorption Line Quasars (FeLoBALs). The observations do detect a non-BAL, wide-binary companion quasar to one of the FeLoBAL quasars. We combine X-ray-derived column density lower limits (assuming solar metallicity) with column densities measured from ultraviolet spectra and CLOUDY photoionization simulations to explore whether constant-density slabs at broad-line region densities can match the physi- cal parameters of these two BAL outflows, and find that they cannot. In the "overlapping-trough" object SDSS J0300+0048, we measure the column density of the X-ray absorbing gas to be NH >= 1.8 x 1024 cm-2. From the presence of Fe ii UV78 absorption but lack of Fe ii UV195/UV196 absorption, we infer the density in that part of the absorbing region to be ne ~ 106 cm-3. We do find that a slab of gas at that density might be able to explain this object's absorption. In the Fe iii-dominant object SDSS J2215-0045, the ...

Rogerson, Jesse A; Snedden, Stephanie A; Brotherton, Michael S; Anderson, Scott F

2010-01-01

347

Vietnamese manicurists: Displacing natives or finding new nails to polish?  

Microsoft Academic Search

Although many people believe that immigrants displace native workers, most economic research finds that immigration has little or no adverse effect on natives' employment outcomes. An unusual opportunity to explore this question in the context of a narrowly defined labor market is afforded by the influx of Vietnamese immigrants into California's market for manicurists. Over the years 1987-2002, the number

Maya N. Federman; David E. Harrington; Kathy J. Krynski

2006-01-01

348

Gastric Adenocarcinoma: Is Computed Tomography (CT) Useful in Preoperative Staging?  

PubMed Central

Background and Purpose: Although multiple studies testing the accuracy of CT in the preoperative staging of gastric adenocarcinoma have been carried out, their results are controversial. Whilst some authors claim that CT is an accurate method for preoperatively staging gastric cancer, others have advocated the contrary. Because of this discrepancy we have retrospectively reviewed preoperative CT findings compared with histopathological results in patients with gastric adenocarcinoma. Patients and Methods: Seventy-two patients diagnosed with gastric cancer who underwent potentially curative surgery and preoperative staging CT of quality were included in the study. The size, gastric wall thickening, presence of lymphadenopathy, adjacent organ invasion and location of the gastric mass was recorded. Early tumors (T1 and T2) and more advanced tumors (T3 and T4) were grouped together. CT staging was correlated with the final histopathological stage (TNM). The global results were expressed as sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV). Results: Seventy-two cases were included with fifty-five being male and a median age of 67 years (range 33–91). CT correctly identified the location of the tumor in 56 (53% antropyloric, 18% subcardial). Median time from CT scan to surgery was fourteen days (range 2–49). In T detection: T1/T2 and T3/T4 with sensitivity of 70% and 61%. Lymph node involvement: Sensitivity 49%. Overstaged in 47% Understaged in 75%. Specificity of 53%. Nine patients with colon-mesocolon (5 patients) and pancreas (4 patients) invasion. Sensitivity 44% and specificity 96%. Conclusion: Spiral CT is not an accurate method in predicting preoperative stages in gastric cancer. PMID:20689615

Cidón, Esther Uña; Cuenca, Isabel Jiménez

2009-01-01

349

JOURNAL CLUB: Head CT Scans in the Emergency Department for Syncope and Dizziness.  

PubMed

OBJECTIVE. The purpose of this study was to determine the yield of acutely abnormal findings on head CT scans in patients presenting to the emergency department with dizziness, near-syncope, or syncope and to determine the clinical factors that potentially predicted acutely abnormal head CT findings and hospital admission. MATERIALS AND METHODS. We retrospectively reviewed the electronic medical records of all patients presenting to an HMO emergency department between July 1, 2012, and December 31, 2012, who underwent head CT for a primary complaint of dizziness, syncope, or near-syncope. The primary outcomes were head CT scans with acutely abnormal findings and hospital admission. Binary logistic regression was used to assess the association between clinical variables and acute head CT findings and between clinical variables and hospital admission. RESULTS. Of the 253 patients who presented with dizziness, 7.1% had head CT scans with acutely abnormal findings, and 18.6% were admitted. Of the 236 patients who presented with syncope or near-syncope, 6.4% had head CT scans with acutely abnormal findings, and 39.8% were admitted. The following three clinical factors were found to be significantly correlated with acutely abnormal head CT findings: a focal neurologic deficit (p = 0.003), age greater than 60 years (p = 0.011), and acute head trauma (p = 0.026). CONCLUSION. Our results suggest that most patients presenting with syncope or dizziness to the emergency department may not benefit from head CT unless they are older, have a focal neurologic deficit, or have a history of recent head trauma. PMID:25539233

Mitsunaga, Myles M; Yoon, Hyo-Chun

2015-01-01

350

Unusual isolated tubercolous epididymitis. Case report  

PubMed Central

We present an unusual case of tuberculous epididymitis in a 33-year-old African patient, who was referred to our Department of Urology with a right intrascrotal mass. There was no evidence of fever, hematuria, dysuria or symptoms from the lower urinary tract. The patient did not demonstrate any laboratory signs of inflammation (white blood cells, C reactive protein). Scrotal sonography revealed a solid heterogeneous, hypoecoic lesion between the epididymal head and the upper testis pole, with disruption of the architecture of the testicular parenchyma. Strong ultrasound suspicion of tuberculous etiology was confirmed by epididymectomy and partial orchiectomy. The patient started an antitubercular treatment. Although rare, epididymal TB may be the only clinically evident location of infection. Clinical suspicion and prompt diagnosis are important because earlier treatment can prevent complications and lead to clinical improvement. PMID:24979105

DELL’ATTI, L.

2014-01-01

351

Structural characterization of unusually stable polycyclic ozonides  

NASA Astrophysics Data System (ADS)

The single crystal structure of seven tri- and tetracyclic ozonides derived from 8-oxabicycle[3.2.1]oct-6-en-3-ones have been characterized by X-ray diffraction method. Five ozonides (4, 5, 6, 7 and 8) crystallize in the monoclinic crystal system with P21/c space group. Compound 3 crystallize in the unusual centrosymmetric space group R 3 bar m, which represents ?0.04% of the total number of structures know. The supramolecular structure of 3 forms infinite channels in a hexagram fashion, resulting in a honeycomb-like structure. Semi-empirical (PM6) and density functional theory methods (DFT) with the B3LYP functional and the 6-31G(d) basis set were used to optimize the geometries and compute structural parameters (bond lengths, angles and dihedral angles) that could be compared to the refined crystal structure. The theoretical results show good agreements with the experimental structure.

Cusati, R. C.; Pereira, U. A.; Barbosa, L. C. A.; Maltha, C. R. A.; Carneiro, José W. M.; Corrêa, R. S.; Doriguetto, A. C.

2015-02-01

352

Two unusual cases of dental (periapical) infection.  

PubMed

Cutaneous sinus tracts of dental origin are often a diagnostic challenge. A delay in correct diagnosis can result in inappropriate treatments. We describe two unusual cases of periapical infection. The first patient presented with a fistulized tumoral mass under the chin present for 1 year. The patient had only one tooth, and that was anatomically unrelated to the tumor. Radiological examination showed a dormant tooth that was infected periapically. The second case was a man who complained of asymmetry and change in his left nasolabial fold of 4-5 week's duration. On examination, the nasolabial folds were asymmetric without any sign of facial palsy. On intraoral examination, there was a severely decayed tooth on the same side. Radiological survey confirmed periapical infection. A few weeks after proper treatment, the nasolabial folds became symmetric. PMID:17083870

Ghodsi, Seyedeh Zahra; Ghiasi, Maryam

2006-01-01

353

Keratoacanthoma centrifugum marginatum at an unusual site.  

PubMed

Keratoacanthoma (KA) is a rapidly evolving tumor, composed of keratinizing squamous cells originating in pilosebaceous follicles and resolving spontaneously if left untreated. It is relatively uncommon in dark-skinned and occurs in middle aged individuals. Males are three times more affected than females. It presents as firm, rounded, flesh-colored or reddish papule; with a rapid growth phase followed by spontaneous healing over three months. Two types of KA exist i.e., solitary and multiple. There are three rare clinical variants of solitary KA, namely giant KA, keratoacanthoma centrifugum marginatum (KCM) and subungual KA. In KCM, lesions are large, reaching upto 20cms. There is peripheral extension with raised, rolled border and atrophy in the center. There is no tendency toward spontaneous involution. The most common locations are dorsa of hands and legs, lesions on scalp being rare. A rare case of KCM occurring on scalp which is an unusual site is reported. PMID:23372220

Phiske, Meghana M; Avhad, Ganesh; Jerajani, Hr

2013-01-01

354

Unusual Presentation of Mediastinal Neurogenic Tumours  

PubMed Central

Mediastinal neurogenic tumours generally arise as single benign lesions and their typical location is the costovertebral sulcus. In about 10% of cases mediastinal neurogenic tumours may extend to the spinal canal; occasionally they may extend to the cervical region and, more rarely, may be multiple or associated with other synchronous mediastinal lesions. The treatment of choice is surgical resection. This report describes three cases of unusual presentation of mediastinal benign schwannomas successfully treated at our Hospital. In the first case multiple simultaneous paravertebral lesions were resected through a posterior approach. In the second case a tumour of the posterior mediastinum extending to the cervical region was excised through a one-stage combined supraclavicular incision followed by left mini-invasive video-assisted thoracoscopic surgical techniques. The third case describes a patient with a posterior neurogenic mediastinal tumour with a synchronous parathyroid adenoma of the anterior mediastinum, which were both successfully resected by video-assisted thoracoscopic surgery. PMID:23738180

Negri, Giampiero; Bandiera, Alessandro; Carretta, Angelo; Puglisi, Armando; Mandelli, Carlo; Ciriaco, Paola; Zannini, Piero

2013-01-01

355

Unusual Quasiparticle Alignments in ^168, 169W  

NASA Astrophysics Data System (ADS)

While the basic concepts of normal deformed low-spin quasiparticle excitations are thought to be well understood, unusual behavior may still be encountered. A recent data set obtained using the Gammasphere spectrometer on ^168W and ^169W is a case in point. Anomalies were observed between the expected [1] and observed alignment gains and crossing frequencies in the positive parity bands for both nuclei. Analysis of these structures will be discussed along with comparisons to neighboring nuclei [2, 3].[4pt] [1] D. R. Jensen et al., Phys. J. A 8, 165 (2000);[0pt] [2] R. B. Yadav et al., Phys. Rev. C 78, 044316 (2008);[0pt] [3] G. D. Dracoulis et al., Nuc. Phys. A. 486, 414 (1988).

Miller, S. L.; Wang, X.; Riley, M. A.; Hartley, D. J.; Pedicini, E.; Vanhoy, J. R.; Riedinger, L. L.; Janssens, R. V. F.; Bertone, P.; Carpenter, M. P.; Chiara, C. J.; Gurdal, G.; Kondev, F. G.; Lauritsen, T.; McCutchan, E. A.; Zhu, S.; Ayangeakka, A. D.; Garg, U.; Matta, J.; Ma, W. C.; Mukhopadhyay, S.; Chowdhury, P.; Hota, S.

2012-03-01

356

Supernumerary teeth: Report of four unusual cases  

PubMed Central

Supernumerary tooth denotes duplication of tooth in the normal series. It is a developmental anomaly and has been argued to arise from multiple etiologies. These teeth may remain embedded in the alveolar bone or can erupt into the oral cavity. The supernumerary tooth might cause esthetic and/or functional problems, especially if it is situated in the maxillary anterior region. Complications reported were delayed or prevented eruption of succedaneous teeth, displacement or rotation, crowding of the affected region, abnormal diastema, dilacerations, cystic formation, and sometime eruption into the nasal cavity. In this case report, four unusual cases of supernumerary teeth that resulted in varying degrees of disturbances in permanent dentition are presented. Conservative surgical intervention and light orthodontic forces were used to bring the teeth into normal position with minimal disturbance to the surrounding oral structures. PMID:22629072

Kumar, Arun; Namdev, Ritu; Bakshi, Lokesh; Dutta, Samir

2012-01-01

357

Birth of an Unusual Planetary System  

NASA Technical Reports Server (NTRS)

This artist's animation shows a brown dwarf surrounded by a swirling disc of planet-building dust. NASA's Spitzer Space Telescope spotted such a disc around a surprisingly low-mass brown dwarf, or 'failed star.' The brown dwarf, called OTS 44, is only 15 times the size of Jupiter, making it the smallest brown dwarf known to host a planet-forming, or protoplanetary disc.

Astronomers believe that this unusual system will eventually spawn planets. If so, they speculate that OTS 44's disc has enough mass to make one small gas giant and a few Earth-sized rocky planets.

OTS 44 is about 2 million years old. At this relatively young age, brown dwarfs are warm and appear reddish in color. With age, they grow cooler and darker.

2005-01-01

358

An Unusual Complication of Crawford Tube Insertion.  

PubMed

The authors describe an unusual and challenging complication of bicanalicular (Crawford) stent insertion that has previously never been reported. A 27-year-old man sustained multiple lacerations to the left (L) periocular and facial areas with a glass bottle. He was admitted under the care of the Plastic Surgical team at another institution and underwent repair of the facial, eyelid, and canalicular lacerations in the operating room. During the surgery, a Crawford stylet was guided in the L inferior canaliculus but was not retrieved nasally. Neuroimaging revealed that the metallic stylet of the Crawford tube was within the orbit, extending via the superior orbital fissure into the middle cranial fossa. The patient was then transferred under the care of the neurosurgical team and underwent a combined orbital/neurosurgical procedure to retrieve the stylet. PMID:24867413

Fan Gaskin, Jennifer C; Gaskin, Brent J

2014-05-26

359

CT manifestations of infarcted epiploic appendages of the colon  

Microsoft Academic Search

Two patients presenting with acute onset of left lower abdominal pain due to infarcted epiploic appendages are the subject of this report. Computed tomography (CT) in both cases showed localized pericolic inflammatory changes corresponding to the location of infarcted epiploic appendages on the serosal aspect of the descending colon or sigmoid. The clinical and radiological findings of this entity are

G. M. Torres; P. L. Abbitt

1994-01-01

360

CT anatomy of hilar lymphadenopathy  

SciTech Connect

The normal distributions of lymph nodes in the pulmonary hili is diagrammatically shown with a typical computed tomographic (CT) demonstration of hilar lymphadenopathy. On the basis of observations in anatomic cross sections of cadaver lungs, the lympth nodes in the right lung can be divided into four principal groups (right upper lobe, interlobar, middle lobe, and lower lobe) and in the left lung into three principal groups (left upper lobe, interlobar, and lower lobe). Most of the hilar lymph nodes are situated along the bronchi in close relation with the pulmonary vascular branches. Because of this close proximity, contrast-enhanced CT images are indispensable for precise CT interpretation of a hilar lymphadenopathy.

Sone, S.; Higashihara, T.; Morimoto, S.; Ikezoe, J.; Arisawa, J.; Monden, Y.; Nahakara, K.

1983-05-01

361

Scoring of chest CT in children with cystic fibrosis: state of the art.  

PubMed

Chest CT has been proposed as a surrogate outcome measure in the evaluation of cystic fibrosis lung disease. Quantitative evaluation of chest CT findings requires application of a scoring system to derive numerical values. Several scoring systems are in use. These mostly rely on a subjective judgement of the severity and extent of various features of cystic fibrosis lung disease, including bronchiectasis, bronchial wall thickening, mucous plugging and air-trapping. Scores can subsequently be added to produce a total score. The precision or reproducibility of scoring systems has been assessed but with heterogeneous statistical approaches. Total scores appear to have high levels of reproducibility, but this might mask poorer levels of agreement for individual observations and component scores. It can also be questioned whether total scores are biologically meaningful, as compared to assessments of individual features. Various studies suggest that CT scores give an accurate indicator of the severity of disease, and CT scores might be the best predictors of long-term outcome, but data in this area are limited. CT scores are more sensitive than traditional lung-function indices such as FEV; however the lung clearance index, by multiple breath washout, appears to offer comparable sensitivity to CT. It is not clear whether CT scores are adequately responsive to changes in disease severity in the short to medium term; this is a challenge to the use of CT as a surrogate outcome measure for clinical trials of therapies specific to cystic fibrosis. Cystic fibrosis scoring would benefit from greater levels of standardisation in terms of CT techniques, scoring system, training of observers and measures of reproducibility. Automated approaches to quantifying CT parameters might also offer improved precision. The benefits of chest CT must be weighed against the principal drawback of radiation exposure. The case for more widespread use of chest CT would be strengthened if precision of CT scoring were improved. PMID:25164326

Calder, Alistair D; Bush, Andrew; Brody, Alan S; Owens, Catherine M

2014-12-01

362

Multiple bile duct hamartomas simulating liver metastases on US and CT: case report  

Microsoft Academic Search

The radiological findings in multiple bile duct hamartomas (MBDH) are rare macroscopic manifestations of a more common microscopic entity. We present a patient in which the US and CT appearance simulated liver metastases. Final diagnosis was made by liver biopsy.

L. M. Swinnen; T. Sainte; G. Verbeeck

1995-01-01

363

Comparison of extensive brain calcification in postoperative hypoparathyroidism on CT and NMR scan  

Microsoft Academic Search

A case of postoperative hypoparathyroidism is presented in which calcifications seen on CT scan were differently visualized on T2 weighted NMR images. High and low signal intensities may reflect different stages of the calcifiying process thus confirming neuropathological findings.

C. Lang; W. Huk; J. Pichl

1989-01-01

364

Spatial-Temporal Analysis of Unusual Hydrometeorological Events  

NASA Astrophysics Data System (ADS)

Precipitation and temperature are the most important meteorological variables that very likely change as a consequence of climate change. These changes might not only affect means, variances, and extremes at single locations, but might also affect in temporal and spatial dynamics. Situations can occur which never occurred before and others might disappear. In the framework of this research, the frequencies of unusual in temporal and spatial events are investigated. Unusual events in temporal scale are defined at a single site as the series of observations which differ from most of the other sequences. For the mathematical definition of unusual events, outlyingness functions are used. Under this definition all extremes are unusual events, but other combinations might also be considered as unusual. A similar definition is used for the spatial context. The occurrences of unusual events in observed temperature and precipitation series are investigated. The methodology is used to identify disappearing and newly appearing unusual events in time series. In addition, it is also used to identify tendencies of changes of unusual events in frequencies and magnitudes. Data from Europe and US are used to illustrate the methodology.

Yulizar, Yulizar; Bárdossy, András

2014-05-01

365

Characterization of Highly Unusual NH+ -O Hydrogen Bonding to  

E-print Network

Characterization of Highly Unusual NH+ -O Hydrogen Bonding to Ester Ether Oxygen Atoms through characterize a highly unusual, charged NH- O hydrogen bond formed within esters of 8-(dimethylamino)- naphthalen-1-ol in which an ammonium ion serves as an intramolecular hydrogen bond donor to spatially

Lectka, Thomas

366

Finding Canadian Government Pubs.  

E-print Network

Finding Canadian Government Pubs. Econ 773 Peggy Findlay Reference Librarian Mills Research Help 2 Objectives Finding print Canadian government publications Electronic Canadian government publications Census Information/ Survey Data #12;Finding Canadian Documents ­ Econ 773 Finding Print Canadian Government

Haykin, Simon

367

Tumors in the tracheobronchial tree: CT and FDG PET features.  

PubMed

A variety of tumors, including primary malignant tumors, secondary malignant tumors, and benign tumors, can occur in the tracheobronchial tree. Primary malignant tumors commonly originate from the surface epithelium or the salivary glands, whereas most benign tumors arise from the mesenchymal tissue. At computed tomography (CT), primary malignant tumors manifest as a polypoid lesion, a focal sessile lesion, eccentric narrowing of the airway lumen, or circumferential wall thickening. At fluorine 18 fluorodeoxyglucose (FDG) positron emission tomography (PET), most squamous cell carcinomas show high uptake, whereas adenoid cystic carcinoma and mucoepidermoid carcinoma show variable uptake depending on the grade of differentiation. High-grade malignancies tend to show high and homogeneous uptake. Carcinoid tumors commonly show intense enhancement at contrast material-enhanced CT, which can be helpful in making the diagnosis, and usually have lower uptake at FDG PET than would be expected for a malignant tumor. Secondary malignant tumors occur as a result of either hematogenous metastasis or direct invasion by a malignancy from an adjacent structure. Their CT manifestations are similar to those of primary malignant tumors, with uptake at FDG PET depending primarily on the metabolic activity and degree of differentiation of the primary tumor. Among the benign tumors, hamartoma and lipoma can show characteristic CT findings such as "popcorn" calcification or internal fat. However, CT findings in most benign tumors are nonspecific. At FDG PET, benign tumors usually show little or no uptake and can be differentiated from malignant tumors. Knowledge of the characteristic CT and FDG PET findings of tracheobronchial tumors can aid in diagnosis and treatment planning. PMID:19168836

Park, Chang Min; Goo, Jin Mo; Lee, Hyun Ju; Kim, Min A; Lee, Chang Hyun; Kang, Mi-Jin

2009-01-01

368

An unusual case of dermatitis herpetiformis.  

PubMed

An adolescent boy whose initial presentation consisted of an asymmetric, nonvesicular rash was eventually diagnosed with dermatitis herpetiformis (DH). Certain factors, including lesions limited to the genitals, an initial biopsy revealing nonspecific findings on microscopy studies, and the absence of characteristic direct immunofluorescence findings lessened initial clinical suspicions of DH over that of scabies infestation. Classic microscopic findings of DH were identified on repeat biopsy. Serologic studies revealed immunoglobulin A (IgA) endomysial and IgA tissue transglutaminase positivity. Response to dapsone proved dramatic. Histopathologic findings, serology, and response to treatment rather than classical clinical findings and direct immunofluorescence supported the diagnosis of DH in this case. PMID:23406540

Clark, Kara; Powers, Roxann; Kovach, Rodney

2014-01-01

369

Hirschsprung disease, unusual face, mental retardation, epilepsy, and congenital heart disease: Goldberg-Shprintzen syndrome.  

PubMed

A 5-year-old girl with Hirschsprung disease, unusual facial appearance, psychomotor retardation, epilepsy, and congenital heart disease is reported. Patients with similar clinical features have been reported and they appear to exhibit the recently identified Goldberg-Shprintzen syndrome. It is believed that this girl also exhibits this new syndrome. Cranial computed tomography demonstrated abnormal findings that may suggest defective neuronal migration and/or dysgenesis of the brain. These findings were considered to cause psychomotor retardation and epilepsy in this patient. PMID:7605558

Tanaka, H; Ito, J; Cho, K; Mikawa, M

1993-01-01

370

An Unusual Urinary Tract Presentation in a Case of Megacystis Microcolon Intestinal Hypoperistalsis Syndrome  

PubMed Central

Megacystis microcolon intestinal hypoperistalsis syndrome is a rare congenital anomaly. Several pathogeneses have been described so far, but there is no single mechanism that can explain all the findings of the syndrome. Affected newborns usually present clinically in the first few days of life. The mainstay of diagnosis is a pre or a postnatal imaging evaluation using ultrasound or magnetic resonance imaging. We report an unusual urinary tract finding in a patient with the classic triads of the syndrome that was diagnosed with both pre and postnatal imaging evaluation. PMID:23372862

Adeb, Melkamu; Anupindi, Sudha; Carr, Michael; Darge, Kassa

2012-01-01

371

Myopericytoma Involving the Parotid Gland as Depicted on Multidetector CT  

PubMed Central

Myopericytoma is a newly proposed subgroup of perivascular tumors in the World Health Organization classification of soft tissue tumors. In this study, we report a case of a benign myopericytoma with detailed multidetector CT (MDCT) findings in the parotid gland, a location that has not been described for this type of tumor previously. The clinical presentation, imaging features, histopathological and immunohistochemical findings, and the differential diagnosis with other tumors in the parotid gland are described and reviewed. PMID:19568469

Chu, Zhi-Gang; Yang, Zhi-Gang; Zhu, Zhi-Yu; Yuan, Hong-Mei

2009-01-01

372

Scientists find mutation driving pediatric brain tumors  

Cancer.gov

A type of low-grade but sometimes lethal brain tumor in children has been found in many cases to contain an unusual mutation that may help to classify, diagnose and guide the treatment of the tumors, report scientists at Dana-Farber Cancer Institute. The researchers led a study of pediatric low-grade gliomas, samples of which were collected through an international consortium organized by brain tumor specialists at Dana-Farber/Children’s Hospital Cancer Center. Their findings are being published online by the Proceedings of the National Academy of Sciences (PNAS) the week of April 29.

373

Multiplanar CT of the spine  

SciTech Connect

This book contains 16 chapters. Some of the topics are: CT of the Sacrum, The Postoperative Spine, Film Organizations and Case Reporting, Degeneration and Disc Disease of the Intervertebral Joint, Lumbar Spinal Stenosis, and Cervical and Thoracic Spine.

Rothman, S.L.G.; Glenn, W.V.

1985-01-01

374

CT Perfusion of the Head  

MedlinePLUS

... scanning combines special x-ray equipment with sophisticated computers to produce multiple images or pictures of the ... being studied can then be examined on a computer monitor, printed or transferred to a CD. CT ...

375

Children's (Pediatric) CT (Computed Tomography)  

MedlinePLUS

... the pelvic region, CT scans can help: detect cysts or tumors in the pelvis evaluate for stones ... of heart disease, asthma, diabetes, kidney disease or thyroid problems. Any of these conditions may influence the ...

376

An unusual cause of acute abdominal pain after cardiac surgery: acute epiploic appendagitis  

PubMed Central

Abdominal complications following cardiac surgery remain unusual, but are associated with high mortality. The most common abdominal surgical complications are mesenteric ischaemia, diverticulitis, pancreatitis, gastrointestinal bleeding and cholecystitis. We describe a case of a 73-year old woman with acute abdominal pain mimicking cholecystitis on day 10 after aortic valve replacement. An abdominal examination showed tenderness of the right upper quadrant with Murphy's sign. Complete blood count, blood chemistries and urinalysis were normal as were the abdominal and chest X-rays and abdominal ultrasonography. The abdominal computed-tomography (CT) scan enabled us to rule out cholecystitis, as it demonstrated the typical appearance of epiploic appendagitis on the right colon, 1 cm below the gallbladder. Epiploic appendagitis results from twisting, kinking or venous thrombosis of an epiploic appendage. Depending on its localization, it mimics many diagnoses requiring surgery: colitis, diverticulitis, appendicitis and cholecystitis. An abdominal CT scan is the diagnostic imaging tool of choice. All physicians involved in post-cardiac surgery care should be aware of this self-limiting disease that usually resolves with non-steroidal anti-inflammatory drugs and watchful waiting, and to avoid unnecessary surgery because the spontaneous evolution of epiploic appendagitis is usually benign. PMID:22547560

Maillet, Jean-Michel; Thierry, Stéphane; Sverzut, Jean-Michel; Brodaty, Denis

2012-01-01

377

An unusual cause of acute abdominal pain after cardiac surgery: acute epiploic appendagitis.  

PubMed

Abdominal complications following cardiac surgery remain unusual, but are associated with high mortality. The most common abdominal surgical complications are mesenteric ischaemia, diverticulitis, pancreatitis, gastrointestinal bleeding and cholecystitis. We describe a case of a 73-year old woman with acute abdominal pain mimicking cholecystitis on day 10 after aortic valve replacement. An abdominal examination showed tenderness of the right upper quadrant with Murphy's sign. Complete blood count, blood chemistries and urinalysis were normal as were the abdominal and chest X-rays and abdominal ultrasonography. The abdominal computed-tomography (CT) scan enabled us to rule out cholecystitis, as it demonstrated the typical appearance of epiploic appendagitis on the right colon, 1 cm below the gallbladder. Epiploic appendagitis results from twisting, kinking or venous thrombosis of an epiploic appendage. Depending on its localization, it mimics many diagnoses requiring surgery: colitis, diverticulitis, appendicitis and cholecystitis. An abdominal CT scan is the diagnostic imaging tool of choice. All physicians involved in post-cardiac surgery care should be aware of this self-limiting disease that usually resolves with non-steroidal anti-inflammatory drugs and watchful waiting, and to avoid unnecessary surgery because the spontaneous evolution of epiploic appendagitis is usually benign. PMID:22547560

Maillet, Jean-Michel; Thierry, Stéphane; Sverzut, Jean-Michel; Brodaty, Denis

2012-08-01

378

Nonlesions, unusual cell types, and postmortem artifacts in the central nervous system of domestic animals.  

PubMed

In the central nervous system (CNS) of domestic animals, numerous specialized normal structures, unusual cell types, findings of uncertain or no significance, artifacts, and various postmortem alterations can be observed. They may cause confusion for inexperienced pathologists and those not specialized in neuropathology, leading to misinterpretations and wrong diagnoses. Alternatively, changes may mask underlying neuropathological processes. "Specialized structures" comprising the hippocampus and the circumventricular organs, including the vascular organ of the lamina terminalis, subfornical organ, subcommissural organ, pineal gland, median eminence/neurohypophyseal complex, choroid plexus, and area postrema, are displayed. Unusual cell types, including cerebellar external germinal cells, CNS progenitor cells, and Kolmer cells, are presented. In addition, some newly recognized cell types as of yet incompletely understood significance and functionality, such as synantocytes and aldynoglia, are introduced and described. Unusual reactive astrocytes in cats, central chromatolysis, neuronal vacuolation, spheroids, spongiosis, satellitosis, melanosis, neuromelanin, lipofuscin, polyglucosan bodies, and psammoma bodies may represent incidental findings of uncertain or no significance and should not be confused with significant microscopic changes. Auto- and heterolysis as well as handling and histotechnological processing may cause postmortem morphological changes of the CNS, including vacuolization, cerebellar conglutination, dark neurons, Buscaino bodies, freezing, and shrinkage artifacts, all of which have to be differentiated from genuine lesions. Postmortem invasion of micro-organisms should not be confused with intravital infections. Awareness of these different changes and their recognition are a prerequisite for identifying genuine lesions and may help to formulate a professional morphological and etiological diagnosis. PMID:22692622

Wohlsein, P; Deschl, U; Baumgärtner, W

2013-01-01

379

Experimental Pulmonary Fat Embolism: Computed Tomography and Pathologic Findings of the Sequential Changes  

PubMed Central

This study was done to demonstrate the computed tomography (CT) and pathologic findings of the sequential changes for experimental pulmonary fat embolism (PFE), and to correlate the CT and pathologic findings of rabbit lung. PFE was induced by an intravenous injection of 0.2 mL linoleic acid in 24 rabbits. The rabbits were divided into 4 groups of 6 rabbits each. CT scans were obtained sequentially at 2 hr (n=24), day 1 (n=18), day 3 (n=12) and day 7 (n=6) after fat embolization. The pathologic findings were analyzed and CT-pathologic correlation was done. CT scans showed bilateral ground-glass opacity (GGO), consolidation and nodule in all cases. The findings of PFE at 2 hr after fat embolization were areas of decreased attenuation, GGO, consolidation and nodule. These findings were aggravated on the follow-up CT after 1 day and 3 days. The follow-up CT revealed linear density in the subpleural lungs after 7 days. On CT-pathology correlation, wedge-shaped ischemic necrosis in the subpleural lungs correlated with nodule at 2 hr. GGO and consolidation at day 1 on CT correlated with congestion and edema, and these findings at day 3 were correlated with inflammation and hemorrhagic edema. The linear density in the subpleural lungs correlated with interstitial fibrosis and pleural contraction at day 7. In conclusion, PFE was caused by using linoleic acid which is kind of free fatty acid and this study served as one model of the occurrence of nontraumatic PFE. CT accurately depicted the natural evolution of PFE in the serial followup, and this correlated well with the pathologic findings. PMID:18756059

Woo, Ok Hee; Yong, Hwan Seok; Oh, Yu-Whan; Shin, Bong Kyung; Kim, Han Kyeom

2008-01-01

380

Ophthalmologic abnormalities on FDG-PET/CT: a pictorial essay  

PubMed Central

Abstract Positron emission tomography (PET) using [18F]-2-deoxy-d-glucose (FDG) diagnoses, stages, and restages many cancers and is often better than anatomic imaging alone. However, abnormalities within the orbit present a challenge in evaluation, mainly due to the subtle findings on PET/computed tomography (CT). In addition, this region is typically at the edge of the field of view for the standard base of skull to upper thigh FDG-PET/CT scans. The aim of this pictorial essay is to illustrate several subtle and apparent abnormalities within the orbit that can have a profound impact on patient management and follow-up. PMID:23524026

Muzaffar, Razi; Shousha, Mohamed A.; Sarajlic, Lejla

2013-01-01

381

Seronegative spondyloarthropathy-related sacroiliitis: CT, MRI features and differentials.  

PubMed

Seronegative spondyloarthropathy is a group of chronic inflammatory rheumatic diseases that predominantly affect the axial skeleton. Involvement of sacroiliac joint is considered a hallmark for diagnosis of seronegative spondyloarthropathy and is usually the first manifestation of this condition. It is essential for the radiologist to know the computed tomography (CT) and magnetic resonance imaging (MRI) features of spondyloarthropathy-related sacroiliitis as imaging plays an important role in diagnosis and evaluation of response to treatment. We present a pictorial essay of CT and MRI imaging findings in seronegative spondyloarthropathy-related sacroiliitis in various stages and highlight common differentials that need to be considered. PMID:25114391

Prakash, Daya; Prabhu, Shailesh M; Irodi, Aparna

2014-07-01

382

Spiral CT and radiation dose  

Microsoft Academic Search

Recent studies in the USA and Europe state that computed tomography (CT) scans compromise only 3–5% of all radiological exams, but they contribute 35–45% of total radiation dose to the patient population. These studies lead to concern by several public authorities. Basis of CT-dose measurements is the computed tomography dose index (CTDI), which was established 1981. Nowadays there are several

H. Imhof; N. Schibany; A. Ba-Ssalamah; C. Czerny; A. Hojreh; F. Kainberger; C. Krestan; H. Kudler; I. Nöbauer; R. Nowotny

2003-01-01

383

The FaCT System  

Microsoft Academic Search

. FaCT is a Description Logic classifier which has been implementedas a test-bed for a highly optimised tableaux satisfiability (subsumption)testing algorithm. The correspondence between modal anddescription logics also allows FaCT to be used as a theorem prover forthe propositional modal logics K, KT, K4 and S4. Empirical tests havedemonstrated the effectiveness of the optimised implementation and, inparticular, of the dependency

Ian Horrocks

1998-01-01

384

SPIO-Enhanced MRI Findings of Well-Differentiated Hepatocellular Carcinomas: Correlation with MDCT Findings  

PubMed Central

Objective This study was designed to assess superparamagnetic iron oxide (SPIO)-enhanced MRI findings of well-differentiated hepatocellular carcinomas (HCCs) correlated with their multidetector-row CT (MDCT) findings. Materials and Methods Seventy-two patients with 84 pathologically proven well-differentiated HCCs underwent triple-phase MDCT and SPIO-enhanced MRI at a magnetic field strength of 1.5 Tesla (n = 49) and 3.0 Tesla (n = 23). Two radiologists in consensus retrospectively reviewed the CT and MR images for attenuation value and the signal intensity of each tumor. The proportion of hyperintense HCCs as depicted on SPIO-enhanced T2- or T2*-weighted images were compared in terms of tumor size (< 1 cm and > 1 cm), five CT attenuation patterns based on arterial and equilibrium phases and magnetic field strength, by the use of univariate and multivariate analyses. Results Seventy-eight (93%) and 71 (85%) HCCs were identified by CT and on SPIO-enhanced T2- and T2*-weighted images, respectively. For the CT attenuation pattern, one (14%) of seven isodense-isodense, four (67%) of six hypodense-hypodense, four (80%) of five isodense-hypodense, 14 (88%) of 16 hyperdense-isodense and 48 (96%) of 50 hyperdense-hypodense HCCs were hyperintense (Cochran-Armitage test for trend, p < 0.001). Based on the use of multivariate analysis, the CT attenuation pattern was the only factor that affected the proportion of hyperintense HCCs as depicted on SPIO-enhanced T2- or T2*-weighted images (p < 0.001). Tumor size or magnetic field strength was not a factor that affected the proportion of hyperintense HCCs based on the use of univariate and multivariate analysis (p > 0.05). Conclusion Most well-differentiated HCCs show hyperintensity on SPIO-enhanced MRI, although the lesions show various CT attenuation patterns. The CT attenuation pattern is the main factor that affects the proportion of hyperintense well-differentiated HCCs as depicted on SPIO-enhanced MRI. PMID:19270856

Lee, Won Jae; Lim, Hyo K.; Park, Cheol Keun

2009-01-01

385

CT-Based Interstitial HDR Brachytherapy  

Microsoft Academic Search

Purpose: Development, application and evaluation of a CT-guided implantation technique and a fully CT-based treatment planning procedure for brachytherapy. Methods and Materials: A brachytherapy procedure based on CT-guided implantation technique and CT-based treatment planning has been developed and clinical evaluated. For this purpose a software system (PROMETHEUS) for the 3D reconstruction of brachytherapy catheters and patient anatomy using only CT

Christos Kolotas; Dimos Baltas; Nikolaos Zamboglou

1999-01-01

386

Closed-loop and strangulating intestinal obstruction: CT signs.  

PubMed

In 19 patients with closed-loop intestinal obstruction, including 16 patients with strangulating obstruction, the findings at examination with computed tomography (CT) were retrospectively correlated with the surgical and pathologic findings and evaluated by two radiologists. Signs of closed-loop obstruction, present in 15 patients, were associated with the configuration of the incarcerated loop of small bowel, abnormalities detected at the site of obstruction, or both. These abnormalities were the following: a U-shaped, distended, fluid-filled bowel loop; the whirl sign; the beak sign; a triangular loop; two adjacent collapsed loops of bowel at the site of obstruction; or all of these. CT signs of strangulation, seen in 10 of the 16 patients with ischemic or infarcted bowel, were associated with the appearance of the bowel wall (thickening, high attenuation, and the target sign), abnormalities in the attached mesentery, or both. In mechanical obstruction of the small bowel, detection of ischemic changes in the bowel wall or mesentery with CT indicates strangulation. Absence of CT findings of ischemia or infarction does not rule out strangulation. PMID:1438761

Balthazar, E J; Birnbaum, B A; Megibow, A J; Gordon, R B; Whelan, C A; Hulnick, D H

1992-12-01

387

An unusual presentation of anetoderma: a case report  

PubMed Central

Background Anetoderma is a benign condition with focal loss of dermal elastic tissue resulting in localized areas of flaccid or herniated saclike skin. Currently, anetoderma is classified as either primary (idiopathic), or secondary anetoderma (which is associated with a variety of skin conditions, penicillamine use, or neonatal prematurity). Lesions appear on the upper arms, trunk, and thighs. Case presentation We report a 14-year-old boy, which was noticed to have had multiple, white, non-pruritic areas on the acral sites of upper and lower extremities for two years. In physical examination, the patient had normal mental development. Skin lesions consisted of scattered, white to skin-colored papules, less than 1 cm in diameter, and with central protrusion, with distribution on dorsal part of the index finger, forearms, distal portion of thighs and calves. Lesions were detected neither on the trunk nor the proximal areas of extremities. There are no sensory changes associated with the lesions. Otherwise, his general health was good. He did not have any medication consumption history. Family history was negative. Laboratory examinations were within normal limits. Skin biopsy from one of his lesions was done, that confirmed the diagnosis of anetoderma. Conclusions In summary, we report a case of anetoderma on unusual sites of the skin. We could not find similar reports of anetoderma developing on distal extremities without involvement of the upper trunk and proximal arms, in the medical literature. PMID:15318943

Aghaei, Shahin; Sodaifi, Manouchehr; Aslani, Fatemeh Sari; Mazharinia, Nazila

2004-01-01

388

MRI Findings of Pericardial Fat Necrosis: Case Report  

PubMed Central

Pericardial fat necrosis is an infrequent cause of acute chest pain and this can mimic acute myocardial infarction and acute pericarditis. We describe here a patient with the magnetic resonance imaging (MRI) findings of pericardial fat necrosis and this was correlated with the computed tomography (CT) findings. The MRI findings may be helpful for distinguishing pericardial fat necrosis from other causes of acute chest pain and from the fat-containing tumors in the cardiophrenic space of the anterior mediastinum. PMID:21603300

Lee, Hyo Hyeok; Jung, Sang Sig; Jung, Seung Mun; Choi, Soo Jung; Shin, Dae Hee

2011-01-01

389

Normal sacroiliac joint: a CT study of asymptomatic patients  

SciTech Connect

The sacroiliac (SI) joints of 45 asymptomatic subjects were prospectively studied to define better the normal appearance of SI joints on CT scans and therby attach appropriate significance to CT signs of sacroiliitis. Joint space narrowing, subchondral sclerosis, erosions, ankylosis, osteophytes, subchondral cysts, and symmetry were evaluted. The results indicate that the SI joints demonstrate symmetry in patients under the age of 30 (100% of subjects in this age group). Those CT findings of sacroiliitis that occurred infrequently in the asymptomatic population, and hence may represent good indicators of sacroiliac disease, include increased sacral subchondral sclerosis in subjects under the age of 40 (11%), bilateral or unilateral uniform joint space of less than 2 mm (2% or 0%, respectively), erosions (2%), and intraarticular ankylosis (0%).

Vogler, J.B. III; Brown, W.H.; Helms, C.A.; Genant, H.K.

1984-05-01

390

CT evaluation of complications of abdominal aortic surgery  

SciTech Connect

The authors conducted a retrospective analysis of the CT findings in 29 consecutive patients being studied to detect complications of aortofemoral bypass surgery. Presenting symptoms included fever in 22 (76%), gastrointestinal bleeding in 2 (7%), a pulsating mass in 3 (10%), jaundice in 1 (3%), and back pain in 1 (3%). The complications observed most frequently were groin infection in 7 (24%), abdominal perigraft abscess in 11 (38%), pseudoaneurysm in 6 (21%), aorto-enteric fistula in 3 (10%), and lymphocystic hematoma in 3 (10%). There were no false negatives, and overall accuracy and sensitivity of CT in detecting complications was 100%. The authors recommend that CT be performed prior to angiography or surgery whenever an abscess, pseudoaneurysm, or aorto-enteric fistula is suspected.

Mark, A.; Moss, A.A.; Lusby, R.; Kaiser, J.A.

1982-11-01

391

12 CFR 792.16 - What unusual circumstances can delay NCUA's response?  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false What unusual circumstances can delay NCUA's response? 792.16 Section... § 792.16 What unusual circumstances can delay NCUA's response? (a...section. The unusual circumstances that can delay NCUA's response to your...

2011-01-01

392

12 CFR 792.16 - What unusual circumstances can delay NCUA's response?  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false What unusual circumstances can delay NCUA's response? 792.16 Section... § 792.16 What unusual circumstances can delay NCUA's response? (a...section. The unusual circumstances that can delay NCUA's response to your...

2012-01-01

393

12 CFR 792.16 - What unusual circumstances can delay NCUA's response?  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false What unusual circumstances can delay NCUA's response? 792.16 Section... § 792.16 What unusual circumstances can delay NCUA's response? (a...section. The unusual circumstances that can delay NCUA's response to your...

2013-01-01

394

12 CFR 792.16 - What unusual circumstances can delay NCUA's response?  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false What unusual circumstances can delay NCUA's response? 792.16 Section... § 792.16 What unusual circumstances can delay NCUA's response? (a...section. The unusual circumstances that can delay NCUA's response to your...

2010-01-01

395

12 CFR 792.16 - What unusual circumstances can delay NCUA's response?  

Code of Federal Regulations, 2014 CFR

...2014-01-01 false What unusual circumstances can delay NCUA's response? 792.16 Section... § 792.16 What unusual circumstances can delay NCUA's response? (a...section. The unusual circumstances that can delay NCUA's response to your...

2014-01-01

396

48 CFR 50.104-3 - Special procedures for unusually hazardous or nuclear risks.  

Code of Federal Regulations, 2010 CFR

...the unusually hazardous or nuclear risks involved in the proposed...involve unusually hazardous or nuclear risks that could impose liability upon the contractor in excess...definition of unusually hazardous or nuclear risks (see paragraph...

2010-10-01

397

48 CFR 50.104-3 - Special procedures for unusually hazardous or nuclear risks.  

Code of Federal Regulations, 2013 CFR

...the unusually hazardous or nuclear risks involved in the proposed...involve unusually hazardous or nuclear risks that could impose liability upon the contractor in excess...definition of unusually hazardous or nuclear risks (see paragraph...

2013-10-01

398

48 CFR 50.104-3 - Special procedures for unusually hazardous or nuclear risks.  

Code of Federal Regulations, 2014 CFR

...the unusually hazardous or nuclear risks involved in the proposed...involve unusually hazardous or nuclear risks that could impose liability upon the contractor in excess...definition of unusually hazardous or nuclear risks (see paragraph...

2014-10-01

399

48 CFR 50.104-3 - Special procedures for unusually hazardous or nuclear risks.  

Code of Federal Regulations, 2011 CFR

...the unusually hazardous or nuclear risks involved in the proposed...involve unusually hazardous or nuclear risks that could impose liability upon the contractor in excess...definition of unusually hazardous or nuclear risks (see paragraph...

2011-10-01

400

48 CFR 50.104-3 - Special procedures for unusually hazardous or nuclear risks.  

Code of Federal Regulations, 2012 CFR

...the unusually hazardous or nuclear risks involved in the proposed...involve unusually hazardous or nuclear risks that could impose liability upon the contractor in excess...definition of unusually hazardous or nuclear risks (see paragraph...

2012-10-01

401

46 CFR 170.173 - Criterion for vessels of unusual proportion and form.  

Code of Federal Regulations, 2014 CFR

...false Criterion for vessels of unusual proportion and form. 170.173 Section 170...173 Criterion for vessels of unusual proportion and form. (a) If required by...170.170(d) as having unusual proportion and form, compliance with...

2014-10-01

402

Incidental finding of complete interruption of the aorta in a septuagenarian.  

PubMed

Adult survivors of aortic interruption is extremely rare. Diagnosis mostly depends on additional imaging with CT and MRI. We present a rare case of acquired complete interruption of the aorta that was found incidentally at the time of coronary angiography. This finding was confirmed by CT scan. PMID:25222340

Ozturk, Semi; Gurbuz, Ahmet Seyfeddin; Efe, Suleyman Cagan

2015-03-01

403

CT appearance of acute radiation-induced injury in the lung  

SciTech Connect

To determine how soon radiation-induced lung injury is detectable, to compare the CT findings with those on chest radiographs, and to observe the appearance of the abnormality during the acute phase, we performed 83 CT studies in 17 radiotherapy patients at relatively short intervals. All 17 patients received fractionated radiotherapy to the thorax with a large irradiated lung volume. The CT findings were variable; pulmonary infiltrates were homogeneous, patchy, or discrete. CT abnormalities were evident in 15 of 17 cases within 16 weeks after radiotherapy; in 13 of these it was detected within 4 weeks. In three of these 15 cases, no abnormality was detected on chest radiographs, and in three other cases, the change was observed much later on chest radiographs than on CT scans. In the other nine cases, abnormalities were detected simultaneously on CT scans and chest radiographs. In four cases, extensive radiation pneumonitis was observed on CT, but in two of these, the change was misdiagnosed on the chest radiograph. We conclude that CT is useful in the detection of acute radiation-induced pulmonary disease.

Ikezoe, J.; Takashima, S.; Morimoto, S.; Kadowaki, K.; Takeuchi, N.; Yamamoto, T.; Nakanishi, K.; Isaza, M.; Arisawa, J.; Ikeda, H.

1988-04-01

404

Unusual features of Drell-Yan diffraction  

SciTech Connect

The cross section of the diffractive Drell-Yan (DY) process, pp{yields}llXp, where the system llX is separated by a large rapidity gap from the recoil proton, is calculated in the light-cone dipole approach. This process reveals unusual features, quite different from what is known for diffractive deeply inelastic scattering (DIS) and non-Abelian radiation: (i) the diffractive radiation of a heavy dilepton by a quark vanishes in the forward direction; (ii) the diffractive production of a dilepton is controlled by the large hadronic radius; (iii) in contrast with DIS where diffraction is predominantly soft, the diffractive DY reaction is semihard-semisoft; (iv) as a result of the saturated shape of the dipole cross section, the fraction of diffractive DY events steeply falls with energy but rises as a function of the hard scale. These features are common for other Abelian bremsstrahlung processes (higgsstrahlung, Z-strahlung, etc.). Measurements of diffractive DY processes at modern colliders would be a sensitive probe for the shape of the dipole cross section at large separations.

Kopeliovich, B. Z. [Departamento de Fisica, Universidad Tecnica Federico Santa Maria, Casilla 110-V, Valparaiso (Chile); Institut fuer Theoretische Physik der Universitaet, Philosophenweg 19, 69120 Heidelberg (Germany); Joint Institute for Nuclear Research, Dubna (Russian Federation); Potashnikova, I. K. [Departamento de Fisica, Universidad Tecnica Federico Santa Maria, Casilla 110-V, Valparaiso (Chile); Joint Institute for Nuclear Research, Dubna (Russian Federation); Schmidt, Ivan [Departamento de Fisica, Universidad Tecnica Federico Santa Maria, Casilla 110-V, Valparaiso (Chile); Tarasov, A. V. [Institut fuer Theoretische Physik der Universitaet, Philosophenweg 19, 69120 Heidelberg (Germany); Joint Institute for Nuclear Research, Dubna (Russian Federation)

2006-12-01

405

Unusual spatiotemporal patterns in fish chorusing  

NASA Astrophysics Data System (ADS)

An unusual fish chorusing behavior has been observed in nighttime underwater acoustic recordings during the Summer off the Southern California coast. Some characteristics of these choruses, i.e., increases in the ocean sound levels by factors of 2 to 5 for 10 to 20 s followed by 15- to 20-s periods of lower levels, repeating every 30 to 40 s all throughout the night, have been described previously. Recently, in reanalyzing data collected during a set of experiments in which Van Holliday participated, we discovered that the choruses along one 25-km stretch of coastline have characteristics analogous to ``The Mexican Wave'' performed by spectators at sporting events worldwide. Each cycle of the chorus begins in waters off the Mexican coast and the region of chorusing propagates upcoast until the fish just south of the mouth of San Diego harbor reach a chorus peak 16 to 20 s after their Mexican counterparts downcoast. This pattern repeats at 30- to 40-s intervals. The speed of this upcoast migration is 100 times faster than the 12 m/s human waves in stadia, approaching the 1.5 km/s speed of sound in water. [Work supported by ONR.

D'Spain, Gerald L.; Berger, Lewis P.

2001-05-01

406

Unusual Inorganic Biradicals: A Theoretical Analysis  

SciTech Connect

Triatomic ions in the series FX2+, where X = O, S, Se, Te and Po are the terminal atoms, exhibit unusually high biradical characters (0.76 < B < 0.92), as measured from the analysis of Multi-Reference Configuration Interaction (MRCI) wavefunctions. Candidates in this series have the largest biradical character among the homologous, 18 valence electron CX22-, NX2?, X3 and OX2 (X = O, S, Se, Te and Po) systems. In the same scale the biradical character of ozone (O3) is just 0.19, whereas that of trimethylenemethane [C(CH2)3] is 0.97 (B=1 for an "ideal" biradical). For the 24 electron XO2 series, consisting of molecules with two oxygen atoms and a moiety X that is isoelectronic to oxygen, i.e. X= CH2, NH, O, F+, the singlet (S) state is lower than the triplet (T) one and the S-T splitting as well the barrier between their "open" and "ring" configurations was found to depend linearly with the inverse of the biradical character.

Miliordos, Evangelos; Ruedenberg, Klaus; Xantheas, Sotiris S.

2013-05-27

407

Unusual Superconducting transition in Topological Insulators  

NASA Astrophysics Data System (ADS)

Superconducting transition generally belongs to the U (1) class of phase transitions. However it was pointed out long time ago that if the normal state dispersion relation is "ultrarelativistic" the transition is unusual: even the mean field critical exponents are different from the standard ones leading to a number of observable effects. Attempts to experimentally discover such a system included chiral condensate in graphene. Recently it was found that some 3D topological insulators (that possess the ultrarelativistic metal on its surface) exhibit surface superconductivity.Starting from microscopic TI Hamiltonian with local four fermions interaction, we calculated the total set of the Gor'kov equations allowing to build the Ginzburg – Landau (GL) theory including the magnetic field effects. It was shown that the GL equations reflect the novel chiral universality class, very different from original GL equations. For example the temperature dependence of the coherence length diverges at the critical temperature with critical exponent v = -1 in rather than customary v = -1/2, magnetization near the upper critical magnetic field is quadratic as a function of deviation from the upper critical field while the Superfluid density is ?2 = (Tc ? T)?, ? = 2, not ? = 1.

Li, Dingping; Rosenstein, B.; Shapiro, B. Ya; Shapiro, I.

2014-12-01

408

An unusual case of carbon monoxide poisoning.  

PubMed Central

Carbon monoxide, a gas originating from incomplete combustion of carbon-based fuels, is an important cause of human deaths. In this paper, we describe an unusual carbon monoxide poisoning in a dwelling without obvious sources of combustion gases, for which two adults had to be treated in a hyperbaric chamber. Carbon monoxide readings were taken in the house and in the neighboring homes. Methane gas and nitrogen oxide levels were also monitored in the house air. Soil samples were collected around the house and tested for hydrocarbon residues. The investigation revealed the presence of a pocket of carbon monoxide under the foundation of the house. The first readings revealed carbon monoxide levels of 500 ppm in the basement. The contamination lasted for a week. The investigation indicated that the probable source of contamination was the use of explosives at a nearby rain sewer construction site. The use of explosives in a residential area can constitute a major source of carbon monoxide for the neighboring populations. This must be investigated, and public health authorities, primary-care physicians, governmental authorities, and users and manufacturers of explosives must be made aware of this problem. Images Figure 1 Figure 2 PMID:10379009

Auger, P L; Levesque, B; Martel, R; Prud'homme, H; Bellemare, D; Barbeau, C; Lachance, P; Rhainds, M

1999-01-01

409

An Unusual Stellar Death on Christmas Day  

NASA Technical Reports Server (NTRS)

Long Gamma-Ray Bursts (GRBs) are the most dramatic examples of massive stellar deaths, usually associated with supernovae. They release ultra-relativistic jets producing non-thermal emission through synchrotron radiation as they interact with the surrounding medium. Here we report observations of the peculiar GRB 101225A (the "Christmas burst"). Its gamma-ray emission was exceptionally long and followed by a bright X-ray transient with a hot thermal component and an unusual optical couuterpart. During the first 10 days, the optical emission evolved as an expanding, cooling blackbody after which an additional component, consistent with a faint supernova, emerged. We determine its distance to 1.6 Gpc by fitting the spectral-energy distribution and light curve of the optical emission with a GRB-supernova template. Deep optical observations may have revealed a faint, unresolved host galaxy. Our proposed progenitor is a helium star-neutron star merger that underwent a common envelope phase expelling its hydrogen envelope. The resulting explosion created a GRB-like jet which gets thermalized by interacting with the dense, previously ejected material and thus creating the observed black-body, until finally the emission from the supernova dominated. An alternative explanation is a minor body falling onto a neutron star io the Galaxy

Thone, C. C.; de Ugarte Postigo, A.; Fryer, C. L.; Page, K. L.; Gorosabel, J.; Aloy, M. A.; Perley, D. A.; Kouveliotou, C.; Janka, H. T.; Mimica, P.; Racusin, J. L.; Krimm, H.; Cummings, J.; Oates, S. R.; Holland, S. T.; Siegel, M. H.; De Pasquale, M.; Sonbas, E.; Im, M.; Park, W. K.; Kann, D. A.; Guziy, S.; Hernandez Garcia, L.; Llorente, A.; Bundy, K.

2011-01-01

410

Unusual Features of Drell-Yan Diffraction  

E-print Network

The cross section of the diffractive Drell-Yan (DY) process, pp->(l-lbar X)p, where the system (l-lbar X) is separated by a large rapidity gap from the recoil proton, is calculated in the light-cone dipole approach. This process reveals unusual features, quite different from what is known for diffractive DIS and nonabelian radiation: (i) the diffractive radiation of a heavy dilepton by a quark vanishes in the forward direction; (ii) the diffractive production of a dilepton is controlled by the large hadronic radius; (iii) in contrast with DIS where diffraction is predominantly soft, the diffractive DY reaction is semihard-semisoft; (iv) as a result of the saturated shape of the dipole cross section, the fraction of diffractive DY events steeply falls with energy, but rises as function of the hard scale. These features are common for other abelian bremsstrahlung processes (higgsstrahlung, Z-strahlung, etc.). Measurements of diffractive DY processes at modern colliders would be a sensitive probe for the shape of the dipole cross section at large separations.

B. Z. Kopeliovich; I. K. Potashnikova; I. Schmidt; A. B. Tarasov

2006-05-14

411

Breast Cancer Research Finding Answers. Finding Cures.  

E-print Network

Breast Cancer Research Finding Answers. Finding Cures. Thanks to improvements in treatment and early detection, more and more women are surviving breast cancer. In fact, the five-year survival rate for women with breast cancer today is 90%, up from only 63% in the 1960s. While progress has clearly been

Kowalczykowski, Stephen C.

412

Chest Radiographic and CT Manifestations of Chronic Granulomatous Disease in Adults  

Microsoft Academic Search

OBJECTIVE. The purpose of this study was to describe the thoracic radiologic findings of chronic granulomatous disease in adults. MATERIALS AND METHODS. We retrospectively analyzed the chest radiographic and CT findings in four adults with chronic granulomatous disease during five episodes of lower respiratory tract infection. RESULTS. Chest radiographic findings included areas of consolidation (60%), diffuse re - ticulonodular opacities

Myrna C. B. Godoy; Patrick M. Vos; Peter L. Cooperberg; Carmen P. Lydell; Peter Phillips; Nestor L. Müller; Godoy MCB; Vos PM; Cooperberg PL; Müller NL

413

CT Angiography in the Diagnosis of Brain Death  

PubMed Central

Summary Brain death is defined as the irreversible cessation of functioning of the entire brain, including the brainstem. Brain death is principally established using clinical criteria including coma, absence of brainstem reflexes and loss of central drive to breathe assessed with apnea test. In situations in which clinical testing cannot be performed or when uncertainty exists about the reliability of its parts due to confounding conditions ancillary tests (i.a. imaging studies) may be useful. The objective of ancillary tests in the diagnosis of brain death is to demonstrate the absence of cerebral electrical activity (EEG and evoked potentials) or cerebral circulatory arrest. In clinical practice catheter cerebral angiography, perfusion scintigraphy, transcranial Doppler sonography, CT angiography and MR angiography are used. Other methods, like perfusion CT, xenon CT, MR spectroscopy, diffusion weighted MRI and functional MRI are being studied as potentially useful in the diagnosis of brain death. CT angiography has recently attracted attention as a promising alternative to catheter angiography – a reference test in the diagnosis of brain death. Since 1998 several major studies were published and national guidelines were introduced in several countries (e.g. in France, Austria, Switzerland, the Netherlands and Canada). This paper reviews technique, characteristic findings and criteria for the diagnosis of cerebral circulatory arrest in CT angiography. PMID:25419255

Sawicki, Marcin; Bohatyrewicz, Romuald; Walecka, Anna; So?ek-Pastuszka, Joanna; Rowi?ski, Olgierd; Walecki, Jerzy

2014-01-01

414

Find a Gastroenterologist  

MedlinePLUS

... ACG Site ACG Patients Home / Find a Gastroenterologist Find a Gastroenterologist All ACG Members, Fellows (FACG) and ... Colorectal Cancer Screening See All Procedures (A-Z) Find a Gastroenterologist Locate an ACG member gastroenterologist in ...

415

Find a Doctor  

MedlinePLUS

... Code Enter Valid ZIP Code Plans Clear Profile Find a Doctor Your health plan option determines the ... military treatment facilities" or direct care. >>Learn More Find a Military Hospital or Clinic Find a Multi- ...

416

CT Imaging: Basics and New Trends  

NASA Astrophysics Data System (ADS)

This chapter presents the principle of X-ray CT and its evolution during the last 40 years. The first section describes the physical basis of X-ray CT, tomographic image reconstruction algorithms, and the source of artifacts in X-ray CT images. The second section is devoted to the evolution of CT technology from the first translation-rotation systems to multi-slice spiral CTs currently used today. The next section addresses specific developments of CT technology and applications, like perfusion CT, quantitative CT, and spectral CT. The fourth section introduces the problem of radiation exposure delivered to the patient and its evaluation. Finally the last section addresses the development in micro- and even nano-CT which is a rapidly evolving area in preclinical imaging and biology.

Peyrin, Françoise; Engelke, Klaus

417

PET/CT in pediatric oncology.  

PubMed

Radionuclide functional imaging has become a central part of pediatric oncological practice. There have been a number of major advances in imaging technology in recent years, but multislice CT with PET is the modality generating most interest in cancer imaging. In this review, we discuss the common uses and specific issues with regard to PET-CT imaging in pediatric practice. Brain tumors form a significant percentage of pediatric oncology. Use of FDG-PET in brain tumors has helped distinguish viable, residual, or recurrent tumor from post-therapeutic changes and necrosis. High-grade tumors show high uptake of FDG at diagnosis. FDG-PET results may also not accurately correlate with tumor progression after intensive radiation therapy. FDG-PET has been applied to accurate biopsy of infiltrative tumors, tumor grading, and prognostication. Limited available data also suggest that FDG-PET findings correlate well with histopathology and clinical outcome in children. FDG uptake is generally greater in higher grade lymphomas than in lower grade lymphomas. FDG-PET reveals disease sites that are not detected by conventional staging methods, resulting in upstaging of disease with potential therapeutic review. FDG-PET is useful for assessing need for marrow biopsy, residual or recurrent soft tissue masses seen on CT after therapy. The primary role of FDG-PET in neuroblastoma is in non-MIBG concentrating tumors. [11C]-Hydroxyephedrine ([11C]-HED), an analogue of norepinephrine, and [11C]-epinephrine PET have also been used in evaluating neuroblastoma. Uptake of these tracers is demonstrated within minutes after tracer administration, an advantage over MIBG imaging. The exact roles of FDG-PET in osteosarcoma and Ewing's sarcoma are not definitive. FDG-PET may play an important role in monitoring response to therapy Another diagnostic role may be in assessing patients with suspected metastatic disease. PMID:21131747

Samuel, A M

2010-01-01

418

Serial volumetric registration of pulmonary CT studies  

NASA Astrophysics Data System (ADS)

Detailed morphological analysis of pulmonary structures and tissue, provided by modern CT scanners, is of utmost importance as in the case of oncological applications both for diagnosis, treatment, and follow-up. In this case, a patient may go through several tomographic studies throughout a period of time originating volumetric sets of image data that must be appropriately registered in order to track suspicious radiological findings. The structures or regions of interest may change their position or shape in CT exams acquired at different moments, due to postural, physiologic or pathologic changes, so, the exams should be registered before any follow-up information can be extracted. Postural mismatching throughout time is practically impossible to avoid being particularly evident when imaging is performed at the limiting spatial resolution. In this paper, we propose a method for intra-patient registration of pulmonary CT studies, to assist in the management of the oncological pathology. Our method takes advantage of prior segmentation work. In the first step, the pulmonary segmentation is performed where trachea and main bronchi are identified. Then, the registration method proceeds with a longitudinal alignment based on morphological features of the lungs, such as the position of the carina, the pulmonary areas, the centers of mass and the pulmonary trans-axial principal axis. The final step corresponds to the trans-axial registration of the corresponding pulmonary masked regions. This is accomplished by a pairwise sectional registration process driven by an iterative search of the affine transformation parameters leading to optimal similarity metrics. Results with several cases of intra-patient, intra-modality registration, up to 7 time points, show that this method provides accurate registration which is needed for quantitative tracking of lesions and the development of image fusion strategies that may effectively assist the follow-up process.

Silva, José Silvestre; Silva, Augusto; Sousa Santos, Beatriz

2008-03-01

419

Practical CT technology and techniques  

SciTech Connect

This handbook equips both radiologists and radiologists in training with a thorough working knowledge of the mechanisms and processes of computed tomography (CT) image generation, the common causes of image artifacts, and useful examination protocols for each area of the body. The author explains the fundamental technological principles of CT, focusing on those concepts crucial to successful CT examinations. The first part of the book succinctly reviews the fundamentals of CT technology. It begins with a methodical introduction to key principles of X-ray physics and technology, in which topics such as the modulation transfer function, magnification, and the X-ray tube are discussed in understandable, nonmathematical terms. The author then explains the basic technology of CT scanners, the principles of scan projection radiography, and the essential rules for radiation dosage determination and radiation protection. Careful attention is given to selectable scan factors in both routine and dynamic scanning, as well as to the processes involved in image creation and refinement and the chief determinants of image quality. Basic and specialized program features and the technology of image display, recording, and storage are also thoroughly described.

Berland, L.L.

1987-01-01

420

Unusual Cause of Chest Pain on Radiograph  

PubMed Central

Although pneumomediastinum (PM) is a cause of chest pain, which can be diagnosed on a plain chest radiograph, emergency physicians frequently miss the diagnosis. As follows a description of findings of PM on a chest radiograph. PMID:22224152

Gallitelli, Mauro; De Chirico, Pasquale

2011-01-01

421

Unusual cause of chest pain on radiograph.  

PubMed

Although pneumomediastinum (PM) is a cause of chest pain, which can be diagnosed on a plain chest radiograph, emergency physicians frequently miss the diagnosis. As follows a description of findings of PM on a chest radiograph. PMID:22224152

Gallitelli, Mauro; De Chirico, Pasquale

2011-11-01

422

Evaluation of perforated and nonperforated appendicitis with CT.  

PubMed

Fifty-three patients with 38 cases of perforated appendicitis and 15 cases of appendicitis without perforation were evaluated based on the computed tomography (CT) appearances of appendiceal diameter, phlegmon, abscess, extraluminal air, appendiceal wall enhancement, lateroconal fascial thickening, appendicolith, bowel wall thickening, ascites, ileal wall enhancement, peritoneal enhancement, periappendiceal fluid, omental haziness, retrocecal appendix, intraluminal air, and the combination of intraluminal air and appendicolith. The result of appendiceal diameter was compared using two-sample Student's t test, and the other CT findings were analyzed by Fisher's Exact Test. Our results showed that appendix was larger in caliber in perforated appendix (P< .05). Direct CT signs (i.e., phlegmon, abscess, and extraluminal air) were more specific for perforated appendicitis (P< .05). Indirect signs (bowel wall thickening, ascites, ileal wall enhancement, intraluminal air, and combined intraluminal air and appendicolith) were also found in higher incidence in appendiceal perforation (P< .05). Appendiceal enlargement and ileal wall enhancement were the two predominant findings in one case of perforation. We concluded that direct and indirect CT appearances can differentiate appendicitis with and without perforation. Indirect signs may be helpful in difficult case. PMID:15531143

Yeung, Kwok-Wan; Chang, Ming-Sung; Hsiao, Chao-Peng

2004-01-01

423

Multidetector CT of blunt cervical spine trauma in adults.  

PubMed

A number of new developments in cervical spine imaging have transpired since the introduction of 64-section computed tomographic (CT) scanners in 2004. An increasing body of evidence favors the use of multidetector CT as a stand-alone screening test for excluding cervical injuries in polytrauma patients with obtundation. A new grading scale that is based on CT and magnetic resonance (MR) imaging findings, the cervical spine Subaxial Injury Classification and Scoring (SLIC) system, is gaining acceptance among spine surgeons. Radiographic measurements described for the evaluation of craniocervical distraction injuries are now being reevaluated with the use of multidetector CT. Although most patients with blunt trauma are now treated nonsurgically, evolution in the understanding of spinal stability, as well as the development of new surgical techniques and hardware, has driven management strategies that are increasingly favorable toward surgical intervention. It is therefore essential that radiologists recognize findings that distinguish injuries with ligamentous instability or a high likelihood of nonfusion that require surgical stabilization from those that are classically stable and can be treated with a collar or halo vest alone. The purpose of this article is to review the spectrum of cervical spine injuries, from the craniocervical junction through the subaxial spine, and present the most widely used grading systems for each injury type. PMID:25384284

Dreizin, David; Letzing, Michael; Sliker, Clint W; Chokshi, Falgun H; Bodanapally, Uttam; Mirvis, Stuart E; Quencer, Robert M; Munera, Felipe

2014-01-01

424

What Do Classrooms in Unusually Successful Schools Look Like?  

ERIC Educational Resources Information Center

Briefly described are classrooms in eight unusually successful elementary schools differing in size, grade levels, racial mix, community size and location, and percentage of low income parents. Most were well equipped, had computers and typewriters, and displayed students' work. (RH)

Willis, Charles L.

425

48 CFR 2406.302-2 - Unusual and compelling urgency.  

Code of Federal Regulations, 2014 CFR

...Acquisition Regulations System DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT COMPETITION AND ACQUISITION PLANNING COMPETITION REQUIREMENTS Other Than Full and Open Competition 2406.302-2 Unusual and compelling urgency....

2014-10-01

426

Neutron scattering investigations on the unusual phase behavior of water  

E-print Network

Water is the most ubiquitous substance on earth, and is essential to sustain all known forms of life. However, despite centuries of research, a coherent picture of the unusual phase behavior of water is so far lacking. The ...

Zhang, Yang, Ph. D. Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering

2010-01-01

427

Hereditary coproporphyria: unusual nervous system involvement in two cases  

Microsoft Academic Search

Two cases of hereditary coproporphyria showed unusual nervous system involvement, one epilepsy with onset in childhood, and the other chronic central and peripheral nervous system damage. The literature is briefly discussed.

C. Casali; M. Lo Monaco; L. D'Alessandro; D. Griso; A. Amantea; G. C. Topi; P. Tonali

1984-01-01

428

[Application of digital pathology tools. An unusual case of non-Hodgkin lymphoma].  

PubMed

Currently, lymphoma diagnosis is based on a combination of morphology, immunophenotyping, and molecular testing. Using the example of an unusual case of malignant non-Hodgkin lymphoma, we show that improved visualization using digital pathology contributes to the convergence of these complementary diagnostic modalities. A 45-year-old woman presented with skin rash and cervical lymphadenopathy. Histological workup of an excised lymph node showed loss of normal architecture with diffuse infiltration and increased mitotic activity. Immunohistochemistry for CD3/CD5 showed atypical arrangement and infiltration of a T-cell population that dominated over regionally dense, MUM1-positive plasmacellular infiltrates. Expanded CD21/CD23-positive meshworks of follicular dendritic cells were present within and between regressed follicles and the T-cell infiltrate; staining for CD56 and cyclin-D1 was negative. Quantification of Ki-67 staining within the T-, B- and plasmacellular compartments was achieved by digital image conversion, overlay and subsequent quantification algorithms that revealed proliferation within more than 60% of T-cells, over 50% of plasma cells and only 20% of B-cells. Clonality analysis by PCR revealed monoclonal rearrangement for both T-cell receptor gamma chains and immunoglobulin heavy chains. Taken together, we present an unusual combination of an angioimmunoblastic T-cell lymphoma (AITL) and simultaneous plasmacellular lymphoma. This report demonstrates how application of modern tools of digital pathology can visually integrate unusual morphological and molecular findings. PMID:23011022

Meyer, A-S K; Dallenbach, F E; Lienert, G; Möller, P; Lennerz, J K

2012-11-01

429

CT of thoracic aortic aneurysms.  

PubMed

Aneurysms of the thoracic aorta are most often the result of arteriosclerotic disease. Other causes include degeneration of the medial layer of the aortic wall, either idiopathically or due to genetic disorders such as Marfan syndrome; aortic dissection; trauma; syphilis and other bacterial infection; noninfective aortitis; and congenital anomaly. We review normal anatomy of the aorta and discuss our technique and interpretation of computed tomography (CT) in the evaluation of the thoracic aorta. We illustrate the CT appearance of different types of aortic aneurysms as well as discuss the use of CT for assessing complications of aneurysms, for postoperative follow-up, and in the differentiation of aortic aneurysm from a paraaortic mass. PMID:2217974

Posniak, H V; Olson, M C; Demos, T C; Benjoya, R A; Marsan, R E

1990-09-01

430

Thoracic CT scanning for mediastinal Hodgkin's disease: results and therapeutic implications  

SciTech Connect

Thoracic CT scans were performed on 42 newly diagnosed patients with Hodgkin's disease. Five of 10 patients with negative chest X ray (CXR) had abnormal thoracic CT scans. Among the remaining 32 patients with mediastinal Hodgkin's disease (MHD) on CXR, pericardial (Ep) and chest wall invasion (Ec) were the two most common sites of involvement which were detectable by CT scan alone. Ep and Ec accounted for 16 of 19 of the changes in treatment portal or philosophy based on CT scan findings. Because of the high risk of cardiac or pulmonary radiation toxicity in Ep or Ec, radiation treatment alone may be inadequate. Treatment of mediastinal Hodgkin's disease is reviewed here. The use of CT scans for identification of Ep, Ec, and other abnormalities will allow for more precise treatment, further define the use of conventional radiotherapy, combined modality therapy or whole lung irradiation, and allow more accurate analysis of treatment results.

Rostock, R.A.; Siegelman, S.S.; Lenhard, R.E.; Wharam, M.D.; Order, S.E.

1983-10-01

431

Bronchogenic carcinoma: Staging with MR compared with staging with CT and surgery  

SciTech Connect

Thirty-three patients suspected of having bronchogenic carcinoma were studied prospectively using magnetic resonance (MR). In this group, 30 underwent examination with computed tomography (CT), 15 underwent thoracotomy, six had mediastinal biopsy procedures performed, and eight underwent bronchoscopy. MR studies, which included transaxial spin-echo imaging of all patients and sagittal or coronal imaging of 18, were performed without knowledge of CT findings, using only plain radiographs as a guide. CT and MR provided comparable information regarding the presence and size of mediastinal lymph nodes. MR better discriminated mediastinal nodes from vascular structures. MR was superior to CT in showing enlarged hilar lymph nodes, but CT was better for demonstrating bronchial abnormalities.

Webb, W.R.; Jensen, B.G.; Sollitto, R.; de Geer, G.; McCowin, M.; Gamsu, G.; Moore, E.

1985-07-01

432

Gastric Cancer Staging: EUS And CT  

PubMed Central

ABSTRACT Introduction: Gastric cancer is the fourth most common cancer and the second leading cause of death from cancer. Only complete resection of all gross disease with negative microscopic margins (R0 resection) provides a long-term survival benefit, and the overall 5-year relative survival rate is approximately 20%. To improve survival and quality of life, new therapeutic approaches have been introduced. Material and methods: A total of 277 patients (171 men, 106 women) were included in this analysis. The results from the preoperative EUS and MDCT were compared to the postoperative pathological findings. A radial scanning ultrasonic endoscope was used. In patients with early gastric cancer, especially in cases confined to mucosa, endoscopic resection is performed to avoid unnecessary surgical procedures. To achieve R0 resection for locally-advanced gastric cancer, neoadjuvant treatments have been investigated. Results and discussion: Laparoscopic surgery has been shown to improve quality of life for both early and locally advanced gastric cancer. Endoscopic ultrasonography (EUS), which is considered to be the most precise method for locoregional staging, was commonly used for differentiating mucosal lesions from submucosal lesions. By contrast, computed tomography (CT) was used to detect the presence of distant metastasis. The difference in accuracy between the ?20-mm group and other groups was statistically significant for both EUS and MDCT (P = 0.026 and P = 0.044, respectively). Conclusion: However, recent technological advances with the helical and multi-detector scanners have provided better CT performance. PMID:24783909

Mehmedovi?, Amila; Mesihovi?, Rusmir; Saray, Aida; Vanis, Nenad

2014-01-01

433

An ovary as unusual contents of an incarcerated umbilical hernia.  

PubMed

We present the unusual case of a woman presenting with an incarcerated umbilical hernia. Intraoperatively, the contents of the hernia were found to be an ovary. We outline the clinical presentation of our patient, investigations and management as well as a discussion on unusual contents of umbilical hernias. To our knowledge, this is the first case of a non-malignant ovary incarcerated in an umbilical hernia. PMID:25198958

Ahmed, U; Ahmed, R; Kamat, S; Elkholy, K

2014-09-01

434

Primary intracranial Parachordoma: An unusual tumor in brain  

PubMed Central

Background: Parachordomas are rare soft tissue tumors commonly occurring in limbs, chest, Abdomen, and back. The World Health Organization (WHO) classification includes parachordomas in the same group as mixed tumors and myoepitheliomas. Exact histogenesis of this tumor is unclear. Case Description: A 52-year-old male presented with headache and blurring of vision since one month. Preoperative computed tomography (CT) scan of brain revealed left parieto-occipital tumor extending up to the trigone. Total excision of the tumor was done. Histopathologically, the tumor was composed of relatively uniform cells with eosinophilic cytoplasm in a myxoid stroma and with cartilaginous and osseous metaplasia. The tumoral cells were immunoreactive for cytokeratin, epithelial membrane antigen (EMA), S-100, and vimentin. The constellation of findings revealed the tumor to be parachordoma. Magnetic resonance imaging (MRI) brain during follow-up at one year showed no recurrent tumor. No adjuvant therapy was given to this patient. Conclusion: This is the first reported case of primary intracranial parachordoma. It is difficult to diagnose the lesion preoperatively by imaging alone. Long-term follow-up is necessary in view of few reports in literature of recurrence and metastasis, of parachordomas in other anatomical locations.

Ghanta, Rajesh K.; Uppin, Megha S.; Koti, Kalyan; Hui, Monalisa; Uppin, Shantveer G.; Mukherjee, Kanchan K.

2014-01-01

435

Thallium-201 accumulation in cerebral candidiasis: Unexpected finding on SPECT  

SciTech Connect

The authors present an unexpected finding of Tl-201 uptake in the intracerebral lesions due to candidiasis. SPECT demonstrated the extent of the lesions and a high target-to-background ratio. The regions where abnormal Tl-201 accumulation was seen were nearly consistent with CT scans of those enhanced by a contrast agent. After treatment, most of the abnormal Tl-201 accumulation disappeared.

Tonami, N.; Matsuda, H.; Ooba, H.; Yokoyama, K.; Hisada, K.; Ikeda, K.; Yamashita, J. (Kanazawa Univ. (Japan))

1990-06-01

436

SPECT-CT: applications in musculoskeletal radiology  

PubMed Central

This article reviews the technique, basic science principles and applications of integrated single photon emission CT (SPECT)-CT in musculoskeletal radiology. A review of the current evidence on the topic was undertaken, and selected clinical cases from the authors' institution have been used for illustration. SPECT-CT is a technology with emerging applications that offers technical advantages to image fusion of separately acquired SPECT and CT studies. The prevailing evidence indicates that there may be benefit in adding SPECT-CT to conventional imaging algorithms during the evaluation of some malignant and benign musculoskeletal conditions. SPECT-CT can improve both sensitivity and specificity by reducing equivocal interpretation in comparison to planar scintigraphy or SPECT alone. The evidence base for SPECT-CT in musculoskeletal radiology is still evolving. There is a lack of evidence comparing SPECT-CT with MRI in many key indications, and further research is required in these areas. PMID:24096590

Burke, C; Desai, A; Vijayanathan, S; Gnanasegaran, G

2013-01-01

437

Unusual Tc-99m MDP and I-123 MIBG images in focal pyelonephritis  

SciTech Connect

A 6-year-old boy presented with an inflammatory syndrome. Because Tc-99m MDP bone scintigraphy revealed increased tracer uptake at the upper pole of the right kidney, further studies were oriented towards a diagnosis of renal or adrenal pathology. I-123 metaiodobenzylguanidine (MIBG) accumulated at the site of the abnormal MDP uptake. The diagnosis of neuroblastoma or allied disorder was excluded on the basis of other investigations and further evaluation, suggesting that the MIBG uptake was a false-positive. Findings on clinical imaging, laboratory findings, Tc-99m DMSA imaging, sonography, and CT scanning were highly suggestive of acute focal pyelonephritis.

Jacobs, A.; Lenoir, P.; Delree, M.; Ramet, J.; Piepsz, A. (Vrije Universiteit, Brussel (Belgium))

1990-11-01

438

Pituitary and intradural spinal metastases: an unusual initial presentation of lung cancer.  

PubMed

The authors report the clinical and imaging findings for a 47-year-old woman who presented with the classic symptoms of a sellar or suprasellar mass; the lesion was initially diagnosed as germinoma and was treated accordingly. The patient also had intradural, extramedullary spinal metastases. Radiotherapy failed, and the patient died. Autopsy revealed that the lesions were metastatic from previously unrecognized large-cell carcinoma of the lung. This distribution of metastases from a primary lesion not located within the central nervous system is unusual but should be considered in any patient presenting with masses at these sites, particularly if the response to therapy is less than expected. PMID:7704674

Struk, D W; Knapp, T R; Munk, P L; Poon, P Y

1995-04-01

439

The 2008 US beef scare episode in South Korea: analysis of an unusual public reaction.  

PubMed

We investigated major factors underlying an unusual 2008 public 'candlelight protest' in South Korea about US beef imports related to concerns about bovine spongiform encephalopathy. Using a survey we explored determinants of consumer responses to negative publicity in mass media. Respondents (80.7 per cent) reduced consumption of imported beef during the scare; of those 62.5 per cent decreased consumption of US beef only. We explain the determinants in order of their importance and define the relevant terms from a theory of consumer behavior in economics. Our findings suggest that several effects worked jointly in their influence on most respondents who reduced beef consumption. PMID:25164598

Jin, Hyun J

2014-11-01

440

Imaging Diagnosis of Urethral Leiomyoma, usual Tumour at an Unusual Location  

PubMed Central

Leiomyomas are benign tumours of smooth muscle origin and are the most common uterine masses in females of reproductive age group. Extrauterine leiomyomas are also encountered occassionally and most commonly they involve the genitourinary tract. Leiomyomas arising from urethral smooth muscle are exceptionally unusual which can pose a diagnostic dilemma. Patients usually present with urinary complaints and an intraluminal soft tissue mass bulging from urethral meatus. We are presenting the imaging findings of leiomyoma of distal urethra presenting as a perineal mass with histopathological correlation.

Mehra, Shibani; Garga, U.C.; Jain, Nishchint; Bhardwaj, Krishna

2014-01-01

441

Screening for CRC Using CT Colonography  

Microsoft Academic Search

\\u000a Air contrast barium enema (ACBE), flexible sigmoidoscopy, and colonoscopy have been used to image the colon for many years.\\u000a In recent years, a number of new techniques to image the colon have been introduced and prominent among these is computed\\u000a tomographic (CT) colonography (also called “CTC,” “CT colography,” or “virtual colonoscopy”). CT colonography is a high spatial\\u000a resolution, low-dose CT

Brooks D. Cash

442

Coronary CT angiography with low radiation dose  

Microsoft Academic Search

With the introduction of 64-slice CT and dual-source CT technology, coronary CT angiography (CCTA) has emerged as a useful\\u000a diagnostic imaging modality for the noninvasive assessment of coronary heart disease. Recently, the risks associated with\\u000a ionizing radiation on CT have raised serious concerns. The main concern of exposure to ionizing radiation is the potential\\u000a risk of cancer. CCTA involves much

Lei Xu; Zhaoqi Zhang

2010-01-01

443

An unusual case of suprascapular nerve neuropathy: a case report  

PubMed Central

Introduction Suprascapular nerve neuropathy constitutes an unusual cause of shoulder weakness, with the most common etiology being nerve compression from a ganglion cyst at the suprascapular or spinoglenoid notch. We present a puzzling case of a man with suprascapular nerve neuropathy that may have been associated with an appendectomy. The case was attributed to nerve injury as the most likely cause that may have occurred during improper post-operative patient mobilization. Case presentation A 23-year-old Caucasian man presented to an orthopedic surgeon with a history of left shoulder weakness of several weeks' duration. The patient complained of pain and inability to lift minimal weight, such as a glass of water, following an appendectomy. His orthopedic clinical examination revealed obvious atrophy of the supraspinatus and infraspinatus muscles and 2 of 5 muscle strength scores on flexion resistance and external rotation resistance. Magnetic resonance imaging showed diffuse high signal intensity within the supraspinatus and infraspinatus muscles and early signs of minimal fatty infiltration consistent with denervation changes. No compression of the suprascapular nerve in the suprascapular or spinoglenoid notch was noted. Electromyographic studies showed active denervation effects in the supraspinatus muscle and more prominent in the left infraspinatus muscle. The findings were compatible with damage to the suprascapular nerve, especially the part supplying the infraspinatus muscle. On the basis of the patient's history, clinical examination, and imaging studies, the diagnosis was suspected to be associated with a possible traction injury of the suprascapular nerve that could have occurred during the patient's transfer from the operating table following an appendectomy. Conclusion Our case report may provide important insight into patient transfer techniques used by hospital personnel, may elucidate the clinical significance of careful movement of patients following general anesthesia, and may have important implications for patient safety techniques, including those outlined in the World Health Organization Surgical Safety Checklist program. PMID:21871073

2011-01-01

444

Liver angiomyolipoma: Classic and unusual presentations  

Microsoft Academic Search

Two cases of liver angiomyolipoma (AML) are presented. The first case has the classical imaging findings previously reported. The second case has no fat content on the various imaging modalities. AML should probably be included in the differential diagnosis of any hypervascular lesion of the liver. Preoperative diagnosis with core biopsy is possible.

P. Bergeron; V. L. Oliva; L. Lalonde; G. Allaire; R. Déry; B. T. Bui; P. Daloze; M. AbouJaoude

1994-01-01

445

An unusual presentation of multiple hidrocystomas.  

PubMed

An 85-year-old man sought treatment of multiple nontender bluish papules of 3 years' duration on the forearms, forehead, and temples. On physical examination, blue-tinged, semitranslucent, dome-shaped papules were noted. Workup revealed multiple hidrocystomas. We discuss the findings in our patient and review the literature. PMID:22106725

Scribner, Jane; Regan, Thomas D; Steger, James W

2011-10-01

446

CT of diverticulitis and alternative conditions  

Microsoft Academic Search

The clinical diagnosis of diverticulitis is often uncertain and frequently incorrect. Diagnostic imaging such as with helical CT offers a rapid and accurate diagnosis of diverticulitis and its complications as well as alternative conditions. In particular, helical CT combined with contrast material administered through the colon is highly accurate and can be obtained quickly. CT signs of diverticulitis include focal

Patrick M Rao

1999-01-01

447

The MARS-CT Project September 2009  

E-print Network

://wiki.canterbury.ac.nz/display/MARSCT/Home. The MARS-CT3 is nearly complete and for marketing purposes will be called the MARS- microCT. The gantry of the MARS-camera is under test. We intend to supply complete MARS-microCT systems to research partners

Hickman, Mark

448

Interactive Exploration of Large Remote -CT Scans  

E-print Network

at the participating institutions. But by far the largest datasets come from a high resolution micro CT Scanner. The sheer size of the micro CT scans make them difficult to handle. [NEXT SLIDE] We decided to handle them to store them [the micro CT scans] centrally. Hardware resources at the institutions were limited

Prohaska, Steffen

449

CT Innovators Reunion: Where Are They Now?  

ERIC Educational Resources Information Center

Each year, "Campus Technology" ("CT") gazes across higher ed horizons to identify the most innovative IT programs at colleges and universities around the globe. The projects "CT" profiles are inspiring examples of technology making a difference on campus--at least at that moment. The question is, have they stood the test of time? "CT" followed up…

Schaffhauser, Dian

2012-01-01

450

Rapid growth of an orbital hemangiopericytoma with atypical histopathological findings  

PubMed Central

Hemangiopericytoma is a rare vascular tumor that originates from pericytes. The orbit is a rare location for this particular tumor, and corresponds to 0.8% to 3% of all primary orbital tumors. We report a case of a hemangiopericytoma in a 45-year-old man that had an unusual presentation, as a rapidly growing mass in the anterior right inferior orbit. Given that there are no clinical or radiological signs pathognomonic of this tumor, a careful histopathological examination is necessary to confirm the diagnosis. In our case, it presented also with unusual histopathological findings. The clinical features, radiological findings, differential diagnosis and treatment of this challenging entity are reviewed in this case report. PMID:24353402

Pacheco, Luiz Frederico; Fernandes, Bruno F; Miyamoto, Cristina; Maloney, Shawn C; Arthurs, Bryan; Burnier, Miguel N

2014-01-01

451

Post-radioembolization yttrium-90 PET/CT - part 1: diagnostic reporting  

PubMed Central

Background Yttrium-90 (90Y) positron emission tomography with integrated computed tomography (PET/CT) represents a technological leap from 90Y bremsstrahlung single-photon emission computed tomography with integrated computed tomography (SPECT/CT) by coincidence imaging of low abundance internal pair production. Encouraged by favorable early experiences, we implemented post-radioembolization 90Y PET/CT as an adjunct to 90Y bremsstrahlung SPECT/CT in diagnostic reporting. Methods This is a retrospective review of all paired 90Y PET/CT and 90Y bremsstrahlung SPECT/CT scans over a 1-year period. We compared image resolution, ability to confirm technical success, detection of non-target activity, and providing conclusive information about 90Y activity within targeted tumor vascular thrombosis. 90Y resin microspheres were used. 90Y PET/CT was performed on a conventional time-of-flight lutetium-yttrium-oxyorthosilicate scanner with minor modifications to acquisition and reconstruction parameters. Specific findings on 90Y PET/CT were corroborated by 90Y bremsstrahlung SPECT/CT, 99mTc macroaggregated albumin SPECT/CT, follow-up diagnostic imaging or review of clinical records. Results Diagnostic reporting recommendations were developed from our collective experience across 44 paired scans. Emphasis on the continuity of care improved overall diagnostic accuracy and reporting confidence of the operator. With proper technique, the presence of background noise did not pose a problem for diagnostic reporting. A counter-intuitive but effective technique of detecting non-target activity is proposed, based on the pattern of activity and its relation to underlying anatomy, instead of its visual intensity. In a sub-analysis of 23 patients with a median follow-up of 5.4 months, 90Y PET/CT consistently outperformed 90Y bremsstrahlung SPECT/CT in all aspects of qualitative analysis, including assessment for non-target activity and tumor vascular thrombosis. Parts of viscera closely adjacent to the liver remain challenging for non-target activity detection, compounded by a tendency for mis-registration. Conclusions Adherence to proper diagnostic reporting technique and emphasis on continuity of care are vital to the clinical utility of post-radioembolization 90Y PET/CT. 90Y PET/CT is superior to 90Y bremsstrahlung SPECT/CT for the assessment of target and non-target activity. PMID:23883566

2013-01-01

452

Sigmoid diverticulitis: US findings  

PubMed Central

Acute diverticulitis (AD) results from inflammation of a colonic diverticulum. It is the most common cause of acute left lower-quadrant pain in adults and represents a common reason for acute hospitalization, as it affects over half of the population over 65 years with a prevalence that increases with age. Although 85% of colonic diverticulitis will recover with a nonoperative treatment, some patients may have complications such as abscesses, fistulas, obstruction, and /or perforation at presentation. For these reasons, different classifications were introduced through times to help clinicians to develop a correct diagnosis and guide the treatment and for the same reasons imaging is used in most cases both to realise a differential diagnosis and to guide the therapeutic management. US and CT are both usefull in diagnosis of diverticolitis, and their sensibility and specificity are similar. However CT scanning is essential for investigating complicated diverticular disease especially where there are diffuse signs and clinical suspicion of secondary peritonitis; instead in most uncomplicated cases the experienced sonographer may quickly confirm a diagnosis guided by the clinical signs. US is to be recommended in premenopausal women, and in young people to reduce dose exposure. PMID:23902791

2013-01-01

453

Find a Cancer Doctor  

MedlinePLUS

... Find a Cancer Doctor The Find an Oncologist Database is made available by ASCO as an informational resource for patients and caregivers. The database includes the names of physicians and other health ...

454

Find a Plastic Surgeon  

MedlinePLUS

... Shop ASPS Corporate Opportunities The PSF About Us Find a Plastic Surgeon Please provide search terms. ZIP ... by Procedure Filter by Procedure Do Your Homework Find a board-certified plastic surgeon you can trust ...

455

Find an Orthopaedist  

MedlinePLUS

Find an Orthopaedist Orthopaedic Surgeons: Who Are They and What Do They Do? Choose a search method: ... provided their office address will not appear in Find an Orthopaedist. CME Learning Portfolio Course Calendar Online ...

456

Segmental "misty mesentery" on FDG PET/CT: an uncommon manifestation of mesenteric lymphoma.  

PubMed

Mesenteric lymphomas are commonly seen as bulky hypermetabolic nodal masses on F-FDG PET/CT. Very rarely, these are seen as mesenteric haziness due to localized hyperattenuation of fat, known as "misty mesentery", which morphological imaging-wise has other differentials as well. We report a unique imaging finding of segmental misty mesentery with hypermetabolic mesenteric nodes on FDG PET/CT in a patient who was kept on observation due to inconclusive biopsy, which on follow-up imaging progressed to extensive lymphomatous involvement. Thus, in retrospect, this imaging feature on baseline PET/CT was diagnostic for mesenteric lymphoma. PMID:23797224

Puranik, Ameya D; Purandare, Nilendu C; Agrawal, Archi; Shah, Sneha; Rangarajan, Venkatesh

2014-01-01

457

Dysplastic gangliocytoma (Lhermitte-Duclos disease): CT and MR imaging  

Microsoft Academic Search

Dysplastic gangliocytoma (Lhermitte-Duclos disease) is a rare entity. Usually presenting as a posterior fossa mass, dysplastic gangliocytoma is not a true neoplasm but a hard-to-characterize lesion that may represent an abnormality of cell migration or a phacomatosis. Previous reports of CT findings are rare in the radiologic literature, and high-field (1.5 Tesla) MR images have never been described in the

P. T. Vieco; R. del Carpio-O'Donovan; D. Melanson; J. Montes; A. M. O'Gorman; K. Meagher-Villemure

1992-01-01

458

Small-animal CT: Its difference from, and impact on, clinical CT  

Microsoft Academic Search

For whole-body computed tomography (CT) images of small rodents, a voxel resolution of at least 10?3mm3 is needed for scale-equivalence to that currently achieved in clinical CT scanners (?1mm3) in adult humans. These “mini-CT” images generally require minutes rather than seconds to complete a scan. The radiation exposure resulting from these mini-CT scans, while higher than clinical CT scans, is

Erik L. Ritman

2007-01-01

459

Chordomas: their CT appearance in the cervical, thoracic and lumbar spine  

SciTech Connect

The authors reviewed 25 CT scans of 21 patients who had chordomas in the cervical, thoracic and lumbar spine. Nine patients were studied at the time of initial presentation and 12 after after tumor recurrence. All scans showed vertebral body destruction coupled with an associated soft tissue mass located anteriorly or laterally. Additional CT findings included septated areas of low attenuation within the tumor, amorphous soft tissue calcification, tumor extensions into the spinal canal, disk space involvement, and contrast enhancement.

Meyer, J.E.; Lepke, R.A.; Lindfors, K.K.; Pagani, J.J.; Hirschy, J.C.; Hayman, L.A.; Momose, K.J.; McGinnis, B.

1984-12-01

460

Pulmonary Bone Cement Embolism: CT Angiographic Evaluation with Material Decomposition Using Gemstone Spectral Imaging  

PubMed Central

We report a case of pulmonary bone cement embolism in a female who presented with dyspnea following multiple sessions of vertebroplasty. She underwent spectral CT pulmonary angiography and the diagnosis was made based on enhanced visualization of radiopaque cement material in the pulmonary arteries and a corresponding decrease in the parenchymal iodine content. Here, we describe the CT angiography findings of bone cement embolism with special emphasis on the potential benefits of spectral imaging, providing additional information on the material composition. PMID:25053903

Huh, Sun

2014-01-01

461

¹¹¹In-DTPA cisternography with SPECT/CT for the evaluation of normal pressure hydrocephalus.  

PubMed

Although new MR imaging techniques can provide high-resolution information on CSF dynamics and are not associated with ionizing radiation, SPECT/CT cisternography is a valuable alternative for those with contraindications to MR imaging. SPECT/CT cisternography combines functional and anatomic imaging to provide accurate and detailed information on CSF distribution to be used in conjunction with clinical findings for the diagnosis and evaluation of NPH, as illustrated in this case report. PMID:24463341

Thut, Daniel P; Kreychman, Alena; Obando, J Antonio

2014-03-01

462

Overview of multisource CT systems and methods  

NASA Astrophysics Data System (ADS)

Multiple-source cone-beam scanning is a promising mode for dynamic volumetric CT/micro-CT. The first dynamic CT system is the Dynamic Spatial Reconstructor (DSR) built in 1979. The pursuance for higher temporal resolution has largely driven the development of CT technology, and recently led to the emergence of Siemens dual-source CT scanner. Given the impact and limitation of dual-source cardiac CT, triple-source cone-beam CT seems a natural extension for future cardiac CT. Our work shows that trinity (triple-source architecture) is superior to duality (dual-source architecture) for helical cone-beam CT in terms of exact reconstruction. In particular, a triple-source helical scan allows a perfect mosaic of longitudinally truncated cone-beam data to satisfy the Orlov condition and yields better noise performance than the dual-source counterpart. In the (2N+1)-source helical CT case, the more sources, the higher temporal resolution. In the N-source saddle CT case, a triple-source scan offers the best temporal resolution for continuous dynamic exact reconstruction of a central volume. The recently developed multi-source cone-beam algorithms include an exact backprojection-filtration (BPF) approach and a "slow" exact filtered-backprojection (FBP) algorithm for (2N+1)-source helical CT, two fast quasi-exact FBP algorithms for triple-source helical CT, as well as a fast exact FBP algorithm for triple-source saddle CT. Some latest ideas will be also discussed, such as multi-source interior tomography and multi-beam field-emission x-ray CT.

Zhao, Jun; Lu, Yang; Zhuang, Tiange; Wang, Ge

2010-09-01

463

The warm sacroiliac joint. A finding in pelvic abscess  

SciTech Connect

Two patients with pain referable to the low back and sacroiliac regions had bone scans with similar findings. In each, one sacroiliac joint was warm (uptake on that side was slightly greater than that in the contralateral area). Ga-67 imaging also demonstrated increased uptake in the same locale. Subsequent CT scanning revealed pelvic abscesses adjacent to the affected joints. Asymmetric uptake of bone imaging agent may have been related to hyperemia and heating of the sacroiliac joint. Rapid defervescence with antibiotics and drainage (and no CT evidence of bone involvement) suggested that osteomyelitis was not involved in these cases.

Slavin, J.D. Jr.; Epstein, N.; Negrin, J.A.; Spencer, R.P. (Saint Francis Hospital and Medical Center, Hartford, CT (USA))

1990-09-01

464

Hydatid cyst: unusual presentation as 'breast lump'.  

PubMed

Hydatid cyst in the breast is rare. We report a case of hydatid cyst in the breast in a 30-year-old Indian rural woman who presented with a lump in her left breast. MRI findings showed a cystic lesion in the breast. Histopathological examination showed features consistent with hydatid cyst with surrounding adherent pericystic breast tissue showing fibrocollagenisation and inflammatory response. ELISA for echinococcal antigen was also found to be positive. This case emphasises that preoperative diagnosis of hydatid cyst in the breast is difficult and often missed as the breast is a rare site of echinococcal infection and clinical and imaging findings are wide and non-specific. Cytological diagnosis by fine-needle aspiration may not always be possible. Therefore, hydatid cyst in the breast should always be considered in the differential diagnosis of a breast lump and histopathological confirmation is necessary for early and appropriate treatment. PMID:24729121

Afroz, Nishat; Chaurasia, Jai Kumar; Maheshwari, Veena; Singh, Geetika

2014-01-01

465

Granulomatous pigmented purpura: an unusual histological variant.  

PubMed

Pigmented purpuric dermatoses (PPDs) tend to vary clinically, yet share a similar histology. Granulomas are only rarely seen, with 4 prior reported cases, designated granulomatous pigmented purpura. Historically, granulomatous pigmented purpura has been seen in Asians. In this article, we report the case of a 42-year-old, white female with granulomatous pigmented purpura, the fifth such reported case in the literature. Histopathological examination revealed a granulomatous dermatitis with eosinophils, extravasated erythrocytes, melanophages, and vascular proliferation. These findings were consistently reported on subsequent biopsy 6 months later. This case illustrates a rare histological finding in PPDs. Medications associated with PPD are reviewed and the patient's use of mesalamine and balsalazide for ulcerative colitis are deemed potential triggers, given their relative similarity to aspirin, a known trigger of PPD. Although other granulomatous processes must be excluded in such patients, one must consider the possibility of granulomatous pigmented purpura in the appropriate setting. PMID:19155731

Kerns, Mary Jo J; Mallatt, Bruce Douglas; Shamma, H Nicholas

2009-02-01

466

Fast growing penis ulcer: an unusual coincidence.  

PubMed

A 57-year-old man was seen with a 2-week history of progressive enlargement of an asymptomatic genital ulcer associated with bilateral inguinal lymphadenomegaly. Multiple unprotected heterosexual contacts were reported. The family doctor misdiagnosed primary syphilis with the following laboratory results: negative findings on the Venereal Disease Research Laboratory test, positive findings on the Treponema pallidum particle agglutination assay (titer 1:1280), and IgM negative on the Treponema pallidum particle agglutination assay. The patient was treated with penicillin G for the diagnosis of indeterminate latent syphilis and initially denied authorization for a skin biopsy. After 2 weeks, fast enlargement of the lesion was documented. He underwent skin biopsy, and the histopathologic examin