[Type II bile duct cyst or accessory gall bladder?].

Choledochal and bile duct's cysts are well known, their morphological classification and also operative management had been described in detail. The most frequent are cysts' types I. and IV., in which the operation consists of cyst's resection and biliary tract reconstruction. Authors summarize nowadays knowledge and present case of 21-months old girl, who was diagnosed of choledochal cyst accidentally. She was operated on electively; the operative finding verified 2 cystic lesions with own bile ducts joined to choledochal duct. The proximal cyst had 3 diverticles and thus mimicked a choledochal cyst type IV. on the preoperative examinations. The resection of both cystic lesions was done. This is a unique case of biliary tract malformations.