Double Wall Sign

A finding on a plain supine abdominal film, caused by rupture of a hollow GI viscus—e.g., stomach, duodenum, or colon—in which free air (pneumoperitoneum) outlines the falciform ligament and enhances loops of the small intestine
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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However, the double wall sign can also be a characteristic of Meckel's diverticulum or sonographic artifacts.