[Cystic dilatation of the biliary tract].

Cystic dilatation of the biliary tract is a rare disorder, more common in children, with a high morbidity and mortality rate. Death may follow one of the possible complications (recurrent cholangitis, biliary cirrhosis, cholangiocarcinoma). The Authors report the case of an asymptomatic adult woman. According to CT scan and ERCP the lesion found was classified as type IVb of Todani's classification. The cyst was removed and a Roux en-Y reconstruction was performed. This procedure is currently associated to a low mortality rate and the best long term results.