CT
The aorta distal to the origin of the left subclavian artery is elongated and redundant with buckling and apparent luminal narrowing.
A small segment dilation of the descending thoracic aorta distal to the buckling.
The heart is normal in size and contour.
No dissection or collateral circulation.
Anomalous left common carotid arising from the brachiocephalic artery.