Fig 1. A and B, Volume rendering reconstructions with anteroposterior view (A) and left-lateral view (B) showing a bovine aortic arch variant (white arrow) and a U-shaped dorsal running loop of the left subclavian artery. The posterior course of the proximal part of the left subclavian artery entering the intraspinal space through the left-sided fused vertebrae at the T1 level with the same-level dorsal exiting is clearly seen.