This is a descending aortic dissection caused by a false (probably mycotic) aneurysm (A)of the upper descending aorta (D) which is small. A paraspinal collateral and a dilated left internal thoracic artery are arrowed, and these mean that at some point there is a significant coarctation. The plain film did not show any notching, however. At operation the aneurysm was infected and it and the coarctation were repaired with a good result.
Image 3