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Fig. 9A. —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 shows high-signal-intensity crescentic intramural collection in ascending aorta (arrow), consistent with early subacute type A intramural hematoma.