PneumoperitoneumCreated OnMay 3, 2020Last Updated OnMay 3, 2020byadmin You are here: Main Radiology Pneumoperitoneum < All Topics Table of Contents Gas or air trapped within the peritoneal cavity, but outside the lumen of the bowel. Bowel perforation is a surgical emergency Patient should be positioned sitting upright for 10-20 minutes prior to acquiring the erect chest x-ray image Air/gas under diaphragm is specific sign for pneumoperitoneum Rigler’s/double wall sign *Some of the image photo is taken from web, we do not own this, it’s for knowledge sharing purpose. Rigler’s sign (also known as the double wall sign) is the appearance of lucency (gas) on both sides of the bowel wall.

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