Figure 17a.  Healing of intramural hematoma. (a, b) Unenhanced (a) and enhanced (b) CT scans obtained at the level of the aortic arch show a crescentic area (top arrow) and displacement of calcifications (bottom arrow), findings consistent with a fresh intramural hematoma. (c) Follow-up CT scan obtained 7 months later shows that the intramural hematoma has been absorbed.