Pseudocholecystitis.
D000006:Abdomen, Acute / Q000209:etiology; D000368:Aged; D002764:Cholecystitis / Q000000981:diagnostic imaging*; D002765:Cholecystography; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D005773:Gastroscopy; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000175:diagnosis