label: Ampulla of Vater Neuroendocrine Neoplasm
label_lc: ampulla of vater neuroendocrine neoplasm
description: "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)."