title: Gastrinoma of duodenum. Diagnosis by endoscopy.
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004379:Duodenal Neoplasms / Q000175:diagnosis*; D004724:Endoscopy; D006801:Humans; D008297:Male; D015043:Zollinger-Ellison Syndrome / Q000175:diagnosis*