pancreatic gastrin-producing neuroendocrine tumor functional pancreatic neuroendocrine tumor pancreatic gastrinoma NCIT:C95596 UMLS:C5848106 A neuroendocrine tumor arising from the pancreas. It is characterized by inappropriate secretion of gastrin and associated with Zollinger Ellison syndrome. The latter is characterized by the presence of peptic ulcer, gastroesophageal reflux disease, abdominal pain, diarrhea, and malabsorption. MEDGEN:1849954 GARD:0025441 MONDO:0024638 pancreatic gastrinoma