<prompt> Bile duct strictures are seen in all exceptCBD stoneCholangiocarcinomaTraumaAcute pancreatitis  <response>: Causes of biliary strictures Benign Congenital Biliary atresia Operative injury Cholecystectomy Choledochotomy Gastrectomy Hepatic resection Transplantation Inflammatory Stones Cholangitis Parasitic Sclerosing cholangitis Radiotherapy Trauma Idiopathic Malignant Cholangiocarcinoma CA head of pancreas Ampullary carcinoma Metastasis to liver or biliary tract Ref: Sabiston 20th edition Pgno :1509-1510 