CTICasesAortic Arch Dissection
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Imaging findings
Contrast-enhanced chest CT demonstrates a dissection flap extending into the aortic arch near the level of the left subclavian or left common carotid artery, without involvement of the ascending aorta. A large intimal tear is visualized in the arch itself.
Key takeaways
Dissections involving only the aortic arch and the descending aorta are not Type A dissections, as Stanford and DeBakey classifications traditionally require ascending aortic involvement for a Type A designation. While these arch dissections are sometimes left unclassified, they behave similarly to Type B dissections and are typically managed medically unless complications arise, though some literature suggests their long-term survival may be closer to that of Type A dissections.
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