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The authors present two cases of transient occlusion of the major cerebral arteries which occurred during transfemoral catheterization of the carotid artery. Right hemiplegia and aphasia developed suddenly in both cases, and disappeared completely within 14 hours in one case and 25 minutes in the other. On the angiograms performed at the moment of onset of the symptoms, the site of the occlusion was the left internal carotid artery in one case and the left middle cerebral artery in the other. Angiograms which were repeated soon after clinical improvement revealed complete dissolution of the occluding emboli. These cases present direct radiographic evidence that embolic occlusion of a major cerebral artery and its disappearance is the mechanism of the transient manifestation of the neurological deficits associated with cerebrovascular catheterization.

Transient neurological deficits due to embolic occlusion and immediate reopening of the cerebral arteries.