Gastroscopy. Its value in the diagnosis of ulcer or tumour of the stomach.
D000368:Aged; D003937:Diagnosis, Differential; D005773:Gastroscopy; D006801:Humans; D008297:Male; D011859:Radiography; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D013276:Stomach Ulcer / Q000175:diagnosis* / Q000000981:diagnostic imaging*