PMC3614262_01
Selective angiogram of the left subclavian artery reveals a total occlusion just after its origin.
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The subclavian artery was found to be totally occluded (Figure 1).
Selective angiogram of the left carotid artery show retrograde filling of the left subclavian artery from the left vertebral artery.
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Injection of the left carotid artery demonstrated good collateral circulation by forward flow into the internal carotid artery, Circle of Willis, basilar artery, and then a retrograde flow through the ipsilateral vertebral artery and filling the left subclavian artery (Figure 2).