Ziter F M, Westcott J L
AJR Am J Roentgenol. 1981 Oct;137(4):699-701. doi: 10.2214/ajr.137.4.699.
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.
即使在没有潜在肺部疾病的情况下，胸腔内气体在卧位患者中通常也会处于肺下位置。萎陷肺的边缘可能难以检测到或根本无法检测到，而界限不清的基底透亮区可能是唯一存在的线索。其他有用的表现包括膈肌前部凹陷且清晰可见（前肋膈沟），使膈肌呈现“双”重外观、心尖异常明显以及心包脂肪垂。这些征象应有助于提醒观察者正确诊断气胸。
