label: Ampulla of Vater Enterochromaffin Cell Serotonin-Producing Neuroendocrine Tumor
label_lc: ampulla of vater enterochromaffin cell serotonin-producing neuroendocrine tumor
description: "A well differentiated neuroendocrine tumor that arises from the ampulla of Vater and the periampullary region.  It produces serotonin."