title: Left side abdominal abscess from a retroperitoneal perforation of a duodenal ulcer.
mesh_terms: D000005:Abdomen; D000038:Abscess / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology*; D004381:Duodenal Ulcer / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010439:Peptic Ulcer Perforation / Q000150:complications* / Q000175:diagnosis / Q000000981:diagnostic imaging; D011859:Radiography; D014463:Ultrasonography