Transient ischemic attacks have been attributed to emboli from the external carotid artery in patients with complete occlusion of the internal carotid artery. We report a patient with an external carotid stenosis and normal internal carotid who developed ipsilateral transient ischemic attacks. Real time B-mode ultrasonography demonstrated that the plaque obstructing the exter nal carotid artery extended into the carotid sinus. This may have served as a source of emboli into the internal carotid circulation.
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