title: Retroperitoneal abscess from posterior perforation of duodenal ulcer.
mesh_terms: D000038:Abscess / Q000209:etiology*; D004381:Duodenal Ulcer / Q000150:complications*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010439:Peptic Ulcer Perforation; D012187:Retroperitoneal Space