May Be Caused by

 Common

Air bubble

Ampullary cancer

Bile duct stricture

Calculus

Cholangiocarcinoma

Contraction of choledochal sphincter

Duodenal cancer

Edema of ampullary segment

Extrinsic vascular impression

Gallbladder cancer

Hepatocellular carcinoma

Malignant neoplasm of bile duct

Pancreatic cancer

Stricture

 Uncommon

Ascaris

Benign neoplasm

Blood clot

Clonorchis

Congenital membranous diaphragm of common hepatic duct

Cystic duct insertion

Debris

Fasciola

Food particle

Hydatid cyst

Lymphadenopathy in porta hepatis

Metastasis

Mirizzi syndrome

Mucus

Pericholedochal adhesions

Postoperative plication defect at the site of duct-to-duct anastomosis

Sarcoma botryoides

Spasm of sphincter of Oddi