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Fig. 9B. —Axial double-inversion-recovery MR images (TR/TE, 1690/29; inversion time, 150 msec) of 76-year-old man with progression of intramural hematoma to overt dissection in ascending aorta within 6 days. Image obtained 6 days after A shows that intramural hematoma progressed to type A aortic dissection within 6 days. Note signal intensity difference between true and false lumens. Signal void within true lumen reflects high-velocity blood flow, whereas higher signal within false lumen is related to slower, turbulent flow. Also note defect in intimomedial flap (arrow) representing intimal tear.