Fig. 4.

Magnetic resonance imaging in a 6.5-year-old boy visualized that the right and the left brachiocephalic arteries arose separately from the ipsilateral right aortic arch (RAA) and left aortic arch (LAA). The R1, R2, L1, and L2 denote the right common carotid artery (1^st branch of the right aortic arch), right subclavian artery (2^nd branch of the right aortic arch), left common carotid artery (1^st branch of the left aortic arch), and left subclavian artery (2^nd branch of the left aortic arch), respectively.