CTICasesRight Aortic Arch with Isolated Left Subclavian Artery
Imaging findings
CT angiography shows a right-sided aortic arch with absence of a patent vascular connection between the left subclavian artery and the aortic arch. The left subclavian artery is supplied via retrograde flow from the left vertebral artery (subclavian steal).
Key takeaways
A right aortic arch with an isolated left subclavian artery is a rare congenital arch anomaly. The left subclavian arises from the left pulmonary artery via a ductus arteriosus during embryology; if the ductus closes, the subclavian is isolated from the aorta and must rely on collateral or retrograde vertebral flow.
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