Ampulla of Vater Neuroendocrine Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm with neuroendocrine differentiation that arises from the ampulla of Vater and periampullary region. It includes neuroendocrine tumors (well-differentiated neuroendocrine neoplasms) and neuroendocrine carcinomas (poorly differentiated neuroendocrine neoplasms).

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