Figure 3a. Complex aortic dissection and bilateral hemothorax in a 44-year-old woman with blunt thoracic trauma from a motorcycle accident. (a) Axial CT image of the aortic arch shows the intimomedial flap, which divides the aorta into true (T) and false (F) lumina. (b) Axial CT image of the aortic arch shows the intimal entrance tear (arrow). (c, d) Oblique thin-slab MIP images show the origin of the dissection and its extension to the left common carotid artery (arrow in c) and the brachiocephalic trunk (arrowhead in d).