Cystadenoma of the proximal common hepatic duct: the use of abdominal ultrasonography and transhepatic cholangiography in diagnosis.

Cystadenoma of the extrahepatic bile ducts is a rare cause of obstructive jaundice. In a case seen recently at our institution, the combined findings are abdominal ultrasonography and transhepatic cholangiography were diagnostic; such studies should provide evidence for preoperative recognition.