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Six patients developed acute amnesia associated with unilateral stroke. Brain computed tomography or magnetic resonance imaging revealed lesions in limbic structures,which accounted for the memory deficit.Based on these as well as similar cases in the literature,we delineate three distinct syndromes of unilateral amnesic stroke involving the territories of the posterior cerebral,anterior choroidal,and thalamic penetrating arteries. Eighty-five percent of reported cases have involved the left hemisphere. Persistent as well as transient amnesia may be the sole or primary manifestation of unilateral hemispheric stroke.The vascular mechanisms of amnesic stroke are diverse.Patients presenting with acute amnesia possibly related to cerebral ischemia should be classified by documented or presumed lesion site as well as the involved vascular territory.Left amygdalohippocampal or diencephalic dysfunction may produce a particular vulnerability to global amnesia. |
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amnesia
amnesic stroke
anterior choroidal artery
CAT scan
CAT scan,abnormal
cerebral dominance
cerebral infarction,transient signs with
cerebrovascular accident
cerebrovascular accident,prognosis in
cerebrovascular accident,vascular territory involved
hippocampal infarction
hippocampus
intracerebral hemorrhage
memory,impairment of
MRI
MRI,abnormal
occipital lobe,infarction
posterior cerebral artery
posterior cerebral artery territory infarction
prognosis
quadrantanopsia,homonymous
quadrantanopsia,superior
review article
thalamic amnesia
thalamoperforating arteries
thalamus,infarction of
transient global amnesia
transient neurologic deficit
visual field defect
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