bile duct adenoma (MONDO_0006108, a Monarch Disease Ontology id) is a benign, well-demarcated polypoid neoplasm arising from the bile duct epithelium. According to the growth pattern, it is classified as tubular, papillary, or tubulopapillary. Adenomas arising from the extrahepatic bile ducts usually produce symptoms related to biliary obstruction. Also known as: CHOLANGIOMA, benign, Cholangioadenoma, Cholangioma, Hepatocholangiocellular adenoma, Hepatocholangioma, adenoma of bile duct, adenoma of the bile duct, bile duct adenoma (morphologic abnormality).