The cupola sign.
Marshall
Geoffrey B
GB
Department of Diagnostic Imaging, Foothills Medical Centre, 1403 29th Ave NW, Calgary, AB, Canada T2N 2T9.
D006801:Humans; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging*; D013902:Radiography, Thoracic; D016683:Supine Position; D013904:Thoracic Vertebrae / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*