title: The cupola sign of pneumoperitoneum in the supine patient.
abstract: Free air within the peritoneal cavity can be recognized on supine abdominal films by identification of the median subphrenic space. We have termed this the "cupola sign." In a review of 100 patients with pneumoperitoneum, this sign was seen in 6 patients. In 3 instances it was the only manifestation of a pneumoperitoneum and in 3 instances it was seen in association with air below the right and left diaphragmatic leaves.
mesh_terms: D006801:Humans; D007223:Infant; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging*; D011187:Posture; D011859:Radiography