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Fig. 10. —Intraperitoneal and retroperitoneal gas is present on this CT scan of 61-year-old man with chronic obstructive pulmonary disease, pneumothorax, and retroperitoneal and peritoneal extension of air. Note how gas has easily dissected anterior (straight arrow) and posterior (curved arrow) interfascial planes. Intramural dissection of gas has also occurred in colon.