Silverman P M, Godwin J D, Korobkin M
AJR Am J Roentgenol. 1982 May;138(5):825-7. doi: 10.2214/ajr.138.5.825.
The normal prevertebral space at the level of the diaphragmatic crura contains the aorta, azygos and hemiazygos veins, lymphatics, and nerves. Three patients had gas demonstrated in the retrocrural space by computed tomography (CT). In each patient this gas was shown to represent parts of normal lung insinuated in the retrocrural space. A subsequent prospective evaluation of 100 consecutive CT examinations showed the presence of retrocrural air in 3% of patients. Retrocrural air should not be confused with free retroperitoneal air or gas caused by retroperitoneal abscesses.
在膈脚水平的正常椎前间隙包含主动脉、奇静脉和半奇静脉、淋巴管及神经。3例患者经计算机断层扫描（CT）显示膈脚后间隙有气体。在每例患者中，这种气体被证实代表陷入膈脚后间隙的正常肺组织部分。随后对100例连续CT检查的前瞻性评估显示，3%的患者存在膈脚后积气。膈脚后积气不应与腹膜后游离气体或腹膜后脓肿所致气体相混淆。
