Tetralogy of Fallot Associated With Right Aortic Arch and Isolated Left Brachiocephalic Artery.

A newborn presented with tetralogy of Fallot (TOF), right aortic arch (RAA), and isolated left brachiocephalic artery. The RAA supplied the right common carotid artery, right vertebral artery, and right subclavian artery, in that order. The left common carotid and left subclavian arteries were in continuity with no aortic origin. Ultrasound demonstrated retrograde flow in the left vertebral artery supplying antegrade flow to the diminutive left subclavian artery (ie, "steal phenomenon"). The patient underwent repair of TOF without intervention on the left common carotid or left subclavian arteries and is being followed conservatively.