label: Ampullary Noninvasive Papillary Neoplasm, Pancreatobiliary Type
label_lc: ampullary noninvasive papillary neoplasm, pancreatobiliary type
description: An exophytic, preinvasive, papillary epithelial neoplasm that arises from the ampulla of Vater.  Histologically it resembles the papillary neoplasms of the biliary tree.  This category includes neoplasms with low grade dysplasia and high grade dysplasia.