Scary gas: a spectrum of soft tissue gas encountered in the axial body (part II).
Emerg Radiol. 2017 Aug;24(4):401-409. doi: 10.1007/s10140-017-1491-9. Epub 2017 Mar 2. Sandstrom CK1, Osman SF2, Linnau KF3.
Ectopic gas in the mediastinum, subperitoneal abdomen, and superficial soft tissues is concerning and can be seen in the setting of trauma, iatrogenic injuries, infection, and inflammation. It can spread along different dissection pathways and may present remotely from the involved organ as described in part one. Recognition of ectopic gas on imaging and differentiating it from other causes of benign gas is very important as these conditions associated with ectopic gas can lead to rapid patient deterioration and usually require urgent surgery. In part two, the different causes of ectopic and benign gas in the torso are reviewed as well as the imaging features that can help to narrow the differential diagnosis.