A Rare Variation of Right Subclavian Artery Origin from Posterior Surface of Aortic Arch

Purpose: Several variations of aortic arch have been reported yet. In present study another variation of aortic arch was reported. Right subclavian artery arises from posterior surface of the distal end of the aortic arch. Case Report: we present a variation of an aorticarch in which right subclavian artery arisesfrom posterior surface of the distal end of the aortic arch and passing behind esophagus to reach right side of neck. Conclusion: Review of literature showed that regarding origin of the artery this variation was reported for  the first time by the authors . It seems that the artery narrowed the position the esophagus. However, there were not any other sign of side effect on anatomical structure and of their blood supply.