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Figure 14a.   Thrombosed type A thoracic aortic dissection. (a) Coronal 3D partition shows a dissection flap in the ascending aorta (arrow). The false channel enhances proximally; however, there is evidence of thrombosis distally, which manifests as a lack of enhancement. (b) Oblique sagittal 3D partition shows the extent of the dissection, which extends to the diaphragm. The false channel does not enhance (arrows). (c, d) Oblique sagittal MIP images show components of the dissection.