[A pancreatobiliary malformation causing spontaneous perforation of the extrahepatic bile duct].

Biliaryascitis usually results from a spontaneous or traumatic perforation of the common bile duct, usually at the junction with the cystic duct. Distal duct obstruction, pancreatic fluid reflux up the common bile duct, congenital weakness or a localized mural malformation of the wall of the common duct have been proposed as possible causes. We present an 11-months-old infant girl who developed a biliary ascitis as a consequence of biliary rupture. Perforation was due to malformation of the pancreatico-biliary junction. An uneventful external derivation by tube was performed.