The deep sulcus sign.
On a supine chest radiograph, the only sign of pneumothorax may be a deep lateral costophrenic angle on the involved side. Seven cases where this finding was present are reviewed and the importance of this sign to radiologists and clinicians is stressed.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010994:Pleura / Q000000981:diagnostic imaging; D011030:Pneumothorax / Q000000981:diagnostic imaging*; D011859:Radiography