Ampullary Adenomatous Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A premalignant neoplastic and dysplastic lesion that arises from the ampulla of Vater. It is characterized by the absence of invasion. This category includes intestinal-type adenomas, intra-ampullary papillary-tubular neoplasms, and flat intraepithelial neoplasia.

**Synonyms:** - Preinvasive Neoplasm of the Ampullary Region - Preinvasive Neoplasm of the Ampullary Region