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Portal venous gas. (a,b) Axial CT images from a 79-year-old male, 4 days following coronary artery bypass graft (CABG) with aortic valve replacement (AVR), show locules of gas within peripheral portal vein branches (black arrows). (c) Axial CT slice from a 61-year-old male patient, 3 days post combined CABG/AVR surgery, shows gas in the extrahepatic portion of the main portal vein (white arrow); the gas lies anteriorly with the patient positioned supine.
