Extrahepatic solitary cyst derived from the biliary tree, Report of two cases

Abstract

Case 1 was a 53 year-old male admitted to our hospital for obstructive jaundice. ERCP showed stenosis of the common hepatic duct and a round calcification to the right of the stenosis. Histology revealed cystic formation consisting of fibrosis with calcification. It did not communicate with the biliary tree. Case 2 was a 56 year-old female who had died of liver cirrhosis. Autopsy revealed a 3×3 cm ball-shped cyst adjacent to the cystic duct. Histolocally, although the cyst was lined with bile duct epithelia, it did not communicate with the biliary tree.
We think that the calcification in case 1 might have been the result of regressive changes in a cyst such as that seen in case 2. Cysts near the common hepatic duct, but not communicating with the biliary tree, have not been previously reported and are probably very rare. We propose to call the cyst “extrahepatic solitary cyst derived from the biliary tree”.