Choledocholithiasis causing intrahepatic biliary duct dilation

Discussion:

Choledocholithiasis can be differentiated from a tumor in most cases, as the calculi may have angulated contours depending on the location in the bile duct and they are almost completely surrounded by high-signal-intensity bile (target sign) 1. Whereas abrupt termination of the bile duct and the absence of typical signs of biliary lithiasis have a high correlation with extrahepatic cholangiocarcinoma.

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