Abstract
The anterior spinal artery (ASA) is the blood vessel that supplies the anterior spinal cord, but rarely serves as a collateral to the vertebrobasilar system. This report describes a rare case of bilateral vertebral artery (VA) occlusion associated with moyamoya disease in which the ASA functioned as a dominant anastomosis to the vertebrobasilar system. The case report is followed by a discussion of the significance of the development of the collateral circulation via the ASA.
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