Congenital cystic dilatation of the common bile duct as a cause of primary bile duct stone.

Of the 101 patients with congenital cystic dilatation of the common bile duct, eighty-eight with adult-type cysts are reported on. The association of primary bile duct stone and adult-type cyst of this anomaly is discussed and found to be higher than previously recognized. In the cases without calculi, abnormal arrangement of the pancreaticobiliary ductal system is indicated to play an important role in the manifestation of the symptom. The anatomic and clinical features and the results of treatment for this type of cyst are reviewed.