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Percutaneous transhepatic cholangiography of cancer of the hilar bile duct (BD): the stricture has extended as far as the upper bile duct and the confluence of the left and right hepatic duct. The middle and lower bile ducts and gallbladder are almost normal. Ant., anterior; post., posterior; B2, B3, and B4 indicate the segmental ducts of S2, S3, and S4, respectively
