Bile duct narrowing or obstruction

Bile (from latin bilis), or gall, is a dark-green-to-yellowish-brown fluid produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver (liver bile) and stored and concentrated in the gallbladder. [Source: Wikipedia ]

May Be Caused by

Common: Cholangitis; Choledocholithiasis; Contraction of choledochal sphincter; Hepatic artery chemotherapy; Hepatic artery embolization; Iatrogenic injury; Malignant neoplasm; Pancreatitis; Papillary stenosis; Radiation therapy; Sclerosing cholangitis; Surgical injury; Trauma
Uncommon: Abscess; Adenoma; Advanced hepatocellular disease; AIDS-related cholangiopathy; Amebic liver abscess; Artifact from post-processing technique of MRCP; Ascariasis; Benign neoplasm; Biliary hypoplasia or atresia; Calcified portal vein; Clonorchiasis; Complicated Caroli disease; Congenital membranous diaphragm; Cystadenoma; Debris; Duodenal diverticulum; Fascioliasis; Gastrointestinal stromal tumor; Hepatic artery aneurysm; Hepatic fibrosis-renal cystic disease; Hydatid disease; Iatrogenic biliary stricture; Liver abscess; Liver cyst; Liver neoplasm; Lymphadenopathy in porta hepatis; Metastasis from carcinoma of gallbladder; Metastasis from carcinoma of stomach; Mucus; Myoblastoma; Pancreas cancer metastasis; Papillitis of ampulla; Papilloma; Postbulbar duodenal ulcer with scarring or perforation; Recurrent pyogenic cholangitis; Schistosomiasis; Traumatic stricture