title: Perforated chronic duodenal ulcer in children.
mesh_terms: D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D004381:Duodenal Ulcer / Q000150:complications*; D005260:Female; D006801:Humans; D008297:Male; D010439:Peptic Ulcer Perforation / Q000175:diagnosis* / Q000601:surgery