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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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