intraductal papillary neoplasm of the bile duct intraductal papillary neoplasm of the bile duct intraductal papillary neoplasm of the bile duct, also known as intraductal papillary biliary neoplasm, is a rare type of liver cancer. intraductal papillary neoplasm of the bile ductother namesintraductal papillary biliary neoplasmspecialtyoncology