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There is a dominant right-sided aortic arch from which the right common carotid and right subclavian arteries originate.
A smaller incomplete left aortic arch, from which the left common carotid and left subclavian arteries originate, is demonstrated coursing towards but without communication with a bulge (diverticulum) at the descending aorta. The segment of the left aortic arch between the left subclavian artery and descending aorta is not opacified, likely atretic.
The descending aortic diverticulum does not give rise to an aberrant subclavian artery (unlike in Kommerell diverticulum) and likely represents a remnant of the distal left aortic arch.