A Case Report of an Unusual Type of Choledochal Cyst with Choledocholithiasis: Saccular Dilatation of the Confluent Portion of Both Intrahepatic Ducts

A choledochal cyst is a rare congenital anomaly of the biliary system, manifested as the cystic dilatation of bile ducts, usually occurring in the common bile duct (1-4). The Todani classification system is widely used to classify choledochal cysts; however, not all cases fit into this classification system. Here, we present a case of a choledochal cyst that did not fit into this Todani classification system: saccular cystic dilatation of the confluent portion of both intrahepatic ducts (IHDs).