title: Transient ischemic attack in a patient with absent carotid circulation and dilated vertebrobasilar vessels.
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.
authors.affiliation: Department of Neurology, Louisiana State University Health Sciences Center, Shreveport, Louisiana 71130, USA.
authors.forename: Vivek
authors.initials: V
authors.lastname: Misra
authors.forename: Eduardo
authors.initials: E
authors.lastname: Gonzalez-Toledo
authors.forename: Roger E
authors.initials: RE
authors.lastname: Kelley
mesh_terms: D001488:Basilar Artery / Q000473:pathology / Q000503:physiopathology*; D002343:Carotid Artery, Internal / Q000002:abnormalities* / Q000473:pathology / Q000503:physiopathology; D020785:Central Nervous System Vascular Malformations / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D002533:Cerebral Angiography; D002560:Cerebrovascular Circulation; D003097:Collateral Circulation; D004108:Dilatation, Pathologic; D006801:Humans; D002546:Ischemic Attack, Transient / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D018810:Magnetic Resonance Angiography; D014057:Tomography, X-Ray Computed; D014711:Vertebral Artery / Q000473:pathology / Q000503:physiopathology*