Anomalous origin of the left innominate (brachiocephalic) artery in the right aortic arch: How can it be anomalous when the left innominate artery is absent?

摘要

An unusual case of a rare vascular ring, which has been called right aortic arch with aberrant left innominate artery, is presented. The appearance of this case led to the realization that there is really no innominate artery present in this anomaly but only the left dorsal aorta. We present a clarification of the nature and likely development of the vessels present.