CT diagnosis of superior mesenteric arteriovenous fistula.
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Biomedical subjects
Publications and source records attributed to D R Radin.
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OBJECTIVE: Homosexual men are at risk for a variety of infectious and neoplastic diseases of the anus and rectum, many of which have been reported in the radiologic literature. The purpose of this study was to describe the CT findings in homosexual men with squamous cell carcinoma of the anus and rectum, a topic that has received little attention. MATERIALS AND METHODS: Computed tomography examinations of the abdomen and pelvis of nine homosexual men with squamous cell carcinoma of the anus and rectum were reviewed retrospectively. Six HIV-positive men were 28-44 years old (average, 37 years). Three HIV-negative men were 47-61 years old (average, 54 years). RESULTS: In six of the nine patients, CT showed a mass involving the anal canal. In five of these six patients, the tumor extended caudad to involve perianal fat and skin (one patient), cephalad to involve the rectum and perirectal fat (two patients), or both (two patients). In three of the nine patients, the anal canal did not appear to be involved by the tumor; CT showed circumferential rectal wall thickening (one patient), an excavated eccentric rectal tumor (one patient), or a cystic extramucosal rectal mass (one patient). Computed tomography evidence of noncontiguous metastasis was limited to inguinal and iliac lymph node enlargement in two of the nine patients. CONCLUSION: Because CT findings are varied and nonspecific, squamous cell carcinoma should be included in the differential diagnosis of anorectal lesions in homosexual men.
Computed tomography of a man with cocaine-induced hepatic necrosis demonstrated a narrow peripheral zone of decreased attenuation that showed widening on follow-up examination 4 days later. The patient died of fulminant hepatic necrosis 10 days after presentation.
In a child with biliary and pancreatic ascariasis CT demonstrated liver abscesses and a pancreatic pseudocyst, in addition to air in the biliary tree and main pancreatic duct.
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