The discovery of gastric ulcers and the differential diagnosis between benignancy and malignancy.
D003937:Diagnosis, Differential; D005471:Fluoroscopy; D005753:Gastric Mucosa / Q000000981:diagnostic imaging; D006801:Humans; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging*; D013276:Stomach Ulcer / Q000000981:diagnostic imaging*