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  • Title: Transient ischemic attack in a patient with absent carotid circulation and dilated vertebrobasilar vessels.
    Author: Misra V, Gonzalez-Toledo E, Kelley RE.
    Journal: J Stroke Cerebrovasc Dis; 2007; 16(5):236-7. PubMed ID: 17845923.
    Abstract:
    Internal carotid artery (ICA) agenesis is a rare vascular anomaly that, in combination with occlusion of the contralateral ICA, produces significant strain on the posterior circulation for collateral flow. We report a patient who presented with transient ischemic attack and was found to have congenital ICA agenesis and contralateral ICA occlusion with cerebral perfusion maintained through dilated vertebrobasilar circulation.
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