Abstract
Pancreaticobiliary maljunction is divided in two groups, with cystic dilatation of biliary duct and without cystic dilatation. Cystic dilatation of biliary duct is fundamental as congenital biliary dilatation, but its pathogenesis is not clear. We experienced three cases with cystic dilatation of choledochus and cystic duct but common hepatic duct on pancreaticobiliary maljunction, which conjectured developmental pathogenesis of cystic dilatation of biliary duct.
According to analysis of these cases, we guess as follows: Common hepatic duct is formed by cells of hepatic diverticulum or by unmatured biliary cells of hepatic primordium. Cystic dilatation of biliary duct of pancreaticobiliary maljunction is occurred only in the duct formed by hepatic diverticulum. Recannalization of biliary duct take part in cystic dilatation of biliary duct.
