Intra-Ampullary Papillary-Tubular Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A 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.

**Synonyms:** - Ampullary Noninvasive Papillary Neoplasm, Pancreatobiliary Type - IAPN - Noninvasive Papillary Neoplasm, Pancreatobiliary Type