ARRS 2022 Abstracts

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E1095. Watch Out: Is It a Bubble?
Authors
  1. Rodrigo Loto; Sanatorio Delta
  2. Martin Pesce; Sanatorio Delta
Background
Ectopic gas is defined as the presence of gas in abnormal locations. 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. As a result of fascial interconnectivity and pressure differences between compartments, gas can dissect distant from its source. Based on the embryologic development, an anatomical continuum exists between the spaces allowing air/gas to spread along them.

Educational Goals / Teaching Points
The goals of this exhibit are to identify the origin and cause of ectopic gas; briefly list local sources of ectopic air/gas in each space; review local anatomy, highlighting the main connections among spaces; and recognize certain alarm signs.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
We discuss the different causes of ectopic gas with an etiopathogenic approach. We also discuss common and uncommon causes of ectopic gas.

Conclusion
Ectopic air/gas represents a challenge to the radiologist. Ectopic gas can be a sign of dangerous disease requiring immediate medical or surgical intervention. The objective of our exhibit was to understand the anatomic distribution of ectopic gas. Recognizing these findings may help prevent unnecessary laparotomy.