title: Visibility of the inferior heart border in pneumoperitoneum.
mesh_terms: D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging*; D011187:Posture; D011859:Radiography; D012189:Retrospective Studies