Intraductal papillary neoplasm of the bile duct
Intraductal papillary neoplasms of the bile duct (IPNB) are pre-invasive biliary tree neoplasms considered to be precursor lesions of cholangiocarcinoma.
Different from the intraductal papillary neoplasms of the pancreas (IPMN), which are
commonly lined by mucinous epithelium, IPNBs are lined by biliary epithelium 4.
intracellular mucin production of varying degrees.