CTICasesAberrant Right Subclavian Artery with Congenital Aortic Origin of the Left Vertebral Artery
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Imaging findings
CT angiography demonstrates an aberrant right subclavian artery arising as the final branch of the aortic arch and taking a retroesophageal course. The right vertebral artery arises anomalously from the right common carotid artery, while the left vertebral artery demonstrates an aortic origin, arising directly from the aortic arch.
Key takeaways
Vertebral artery origin anomalies are common congenital vascular variants that frequently co-exist with other arch anomalies like an aberrant right subclavian artery. When the vertebral artery arises from the common carotid or the aorta rather than the subclavian artery, the patient is hemodynamically protected from developing subclavian steal syndrome on that side.
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