Supine subpulmonary pneumothorax

AJR. American Journal of Roentgenology
F M Ziter, J L Westcott

Abstract

Intrapleural air often assumes a subpulmonary position in the recumbent patient even in the absence of underlying pulmonary disease. The margins of the collapsed lung may be difficult or impossible to detect, and a poorly defined basilar hyperlucency may be the only clue present. Additional helpful findings include depression and clear visualization of the diaphragm anteriorly (anterior costophrenic sulcus) creating a "double" appearance to the diaphragm, an unusually distinct cardiac apex, and pericardial fat tags. These signs should help alert the viewer to the correct diagnosis of pneumothorax.

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