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Fig. 1B. —31-year-old man who sustained high-speed trauma. Nonhelical contrast-enhanced CT scan obtained using 10-mm collimation at level of aortic isthmus 30 min after A shows circumferential enlargement of aortic isthmus region and target appearance of contrast column. These changes are believed to represent concentric dissection of aorta, with low-attenuation ring (arrow) representing intimal flap.