bile duct papillary neoplasm (MONDO_0003455, a Monarch Disease Ontology term) is a non-invasive, papillary epithelial neoplasm that arises from the epithelium of the intrahepatic or extrahepatic bile ducts. Also known as: IPN, bile duct papillary epithelial neoplasm, bile duct papillomatosis, biliary papillomatosis, intraductal papillary neoplasm.