Extrahepatic Mucinous Biliary Cystadenoma: A Case Report.

Biliary cysts refer to cystic dilatation in the biliary ductal system that may be congenital or acquired. Extrahepatic biliary cysts constitute less than 10% of biliary cysts. Extrahepatic mucinous cystadenoma represents an extremely rare clinical condition with less than 100 cases reported in the English medical literature.