Ampulla of Vater Neuroendocrine Tumor

**Semantic type:** Neoplastic Process

**Definition:** A well-differentiated, low-, intermediate-, or high-grade neoplasm with neuroendocrine differentiation that arises from the ampulla of Vater and periampullary region.

**Synonyms:** - Ampulla of Vater NET - Neuroendocrine Tumor of the Ampullary Region