CTICasesRight Aortic Arch with Isolated Left Subclavian Artery
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Imaging findings
A 20-30 year old female presented with an anomaly of the aortic arch. CT demonstrated a right aortic arch with only two branches: the right common carotid and the right subclavian. The left subclavian artery was isolated, reconstituting distal to the arch, and the left common carotid was diminutive.
Key takeaways
Right aortic arch with isolated left subclavian artery is a rare vascular variant resulting from a double arch pattern with two segments of atresia. It carries implications for cerebral perfusion, as the left-sided circulation is disconnected from the aortic arch.
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