Papil stenosis with dilatated bile ducts and pancreatic duct. Biopsy showed chronic inflammation but no malignancy. Various causes of bile duct dilatation: Dilatated common bile duct caused by impression of a cystic mass of the pancreatic head and only minor dilatation of the pancreatic duct. Th ... Case of the month July 2005:  View case 10/18. View case 11/18.