title: A 4-year-old boy with pneumopericardium.
mesh_terms: D002675:Child, Preschool; D006801:Humans; D008297:Male; D010439:Peptic Ulcer Perforation / Q000150:complications / Q000473:pathology; D011026:Pneumopericardium / Q000209:etiology / Q000473:pathology*; D011379:Prognosis; D013276:Stomach Ulcer / Q000150:complications / Q000473:pathology