title: Pneumoperitoneum.
authors.affiliation: Department of Emergency Medicine, Temple University Hospital, Philadelphia, Pennsylvania 19140, USA.
authors.forename: Amanda
authors.initials: A
authors.lastname: Horn
authors.forename: Gerald
authors.initials: G
authors.lastname: O'Neill
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Costantino
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010439:Peptic Ulcer Perforation; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging* / Q000209:etiology*; D011859:Radiography; D013276:Stomach Ulcer / Q000150:complications*; D014463:Ultrasonography