Aortic arch origin of left vertebral artery
Altered conscious state secondary to subarachnoid hemorrhage.
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Variant origin of the left vertebral artery as the third branch of the aortic arch.
Origin of the left vertebral artery is classically from the left subclavian artery. However, ~5% of left vertebral arteries will have a variable origin with the most common being as a branch of the aortic arch 1.