Ampulla of Vater Composite Gangliocytoma/Neuroma and Neuroendocrine Tumor

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm that arises from the ampulla of Vater and the periampullary region. It consists of a mixture of neuroendocrine cells, Schwann-like cells, and ganglion cells. It was formerly known as gangliocytic paraganglioma.

**Synonyms:** - Ampulla of Vater CoGNET - Ampulla of Vater Gangliocytic Paraganglioma - Gangliocytic Paraganglioma of the Ampullary Region