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MRI showed focal ischemic lesions in 50 patients(81%),but an acute TIA- associated infarct was seen in only 19 subjects(31%).In patients with an acute lesion,the infarcts were smaller than 1.5 cm in 13(68%),purely cortical in 11(58%),and multiple in 7(37%)individuals.Contrast enhancement contributed to the delineation of an acute lesion in only 2 of 45 patients (4%).Acute infarction was unpredictable by clinical TIA features,but the frequency of identifiable vascular or cardiac causes was significantly higher in those patients with TIA-related morphological damage(odds ratio, 5.2[95%confidence interval,1.6 to 17.3]).More than two thirds of TIA patients showed no associated brain lesion even when MRI and contrast material were used,but the overall frequency of ischemic damage was high. TIA-related infarcts on MRI were mostly small and limited to the cortex and tended to consist of multiple lesions.A positive MRI underscores the need for comprehensive diagnostic workup since evidence of infarction appears to be associated with a higher frequency of significant vascular or cardiac disorders. |
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asymptomatic
CAT scan
CAT scan,abnormal
cerebral infarction
cerebrovascular accident
cerebrovascular accident,multiple
cerebrovascular accident,silent
MRI
MRI,abnormal
MRI,CAT scan compared to
MRI,contrast enhanced
transient ischemic attack
treatment of neurologic disorder
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