A right-sided aortic arch from which the right common carotid and right subclavian arteries originate is demonstrated. The right vertebral artery arises directly from the right aortic arch between the right common carotid and right subclavian arteries.
There is also a smaller incomplete left aortic arch from which the left common carotid and left subclavian arteries originate. The left vertebral artery also arises directly from the left aortic arch. The patent segment of the left aortic arch courses towards a diverticulum (red arrow) at the descending aorta suggesting the presence of a fibrous cord (representing an atretic segment of the left aortic arch) between the two structures. The descending aortic diverticulum is posterior to the oesophagus. The oesophagus proximal to the diverticulum is dilated likely due to compression by the formed vascular ring.
No other significant intra- or extracardiac congenital cardiovascular anomaly is seen.