title: Hilar cholangiocarcinoma: thin-section spiral CT findings with cholangiographic correlation.
abstract: Hilar cholangiocarcinoma, a highly lethal tumor, is difficult to diagnose with conventional computed tomography (CT) because of its small size. Spiral CT allows more effective evaluation of these small lesions and better demonstrates the status of the hepatic arterial or portal venous circulation. Among 27 patients with hilar cholangiocarcinoma (infiltrative in 21, exophytic in two, polypoid in one, diffuse in three), thin-section spiral CT allowed identification of each tumor as an area of focal wall thickening that obliterated the lumen. Seventeen of the infiltrative tumors (81%) showed high attenuation. Identification of the level of biliary obstruction was possible in 63% of the patients (17 of 27). The level of obstruction was underestimated in six patients and overestimated in four. Spiral CT is a valuable method for diagnosis of hilar cholangiocarcinoma; however, spiral CT is less accurate in evaluation of intraductal tumor extent because of the limited z-axis resolution.
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, South Korea.
authors.forename: J K
authors.initials: JK
authors.lastname: Han
authors.forename: B I
authors.initials: BI
authors.lastname: Choi
authors.forename: T K
authors.initials: TK
authors.lastname: Kim
authors.forename: S W
authors.initials: SW
authors.lastname: Kim
authors.forename: M C
authors.initials: MC
authors.lastname: Han
authors.forename: K M
authors.initials: KM
authors.lastname: Yeon
mesh_terms: D000328:Adult; D000368:Aged; D001650:Bile Duct Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D001653:Bile Ducts, Intrahepatic / Q000000981:diagnostic imaging* / Q000473:pathology; D018281:Cholangiocarcinoma / Q000000981:diagnostic imaging* / Q000473:pathology; D002758:Cholangiography; D002780:Cholestasis, Intrahepatic / Q000000981:diagnostic imaging / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed