CTA Thoracic aorta
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There is an descending aortic dissection, that begins beyond brachiocephalic vessels (Stanford B) and only involves the descending aorta (DeBakey type III). Note also the presence of the aortic valve prosthesis and a small proximal endoleak due a Dacron graft on ascending aorta (not seen on enhanced series).
The coeliac and superior mesenteric arteries both arise from the smaller true lumen.