When is an ulcer not an ulcer?
D003937:Diagnosis, Differential; D004932:Esophageal and Gastric Varices; D004945:Esophagoscopy; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D005773:Gastroscopy; D006801:Humans; D010437:Peptic Ulcer; D009626:Terminology as Topic