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Fig. 1. —51-year-old man with aortic dissection. Patient did not receive oral contrast material as evidenced by low-density gastric fluid. Contrast-enhanced axial CT scan reveals clear distinction between normally enhanced (arrows) and unenhanced (arrowheads) collapsed small-bowel loops. Normally enhanced duodenum and proximal jejunum were supplied by anastomotic branches from gastroduodenal artery and possible minimally patent jejunal artery. Aorta (A) and superior mesenteric artery (SMA) were occluded with thrombi-filled false lumen.