Radiographic finding of gas in bowel wall

A left lateral decubitus.

• Free intraperitoneal air: seen as a triangle of gas between the right colon and the abdominal wall (white arrows)
• Rigler Sign (black arrowheads)

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• Pneumatosis, with extensive linear and curvilinear arcs of gas seen in the bowel wall of the left colon and rectum (black arrows) . </aside>