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Among 46 noncontrast magnetic resonance studies on patients with cerebral infarction,11 showed areas of high signal intensity of the involved brain on T1-weighted images.These areas were more frequent in cerebral or cerebellar cortical lesions.Lacunar infarcts in lenticular nuclei,internal capsules,corona radiata,or brain stem did not show any high signal intensity areas on T1-weighted images,whereas the thalamic infarcts did. Sequential studies revealed that these lesions displayed low signal intensity on T2-weighted images at first,and then a high signal intensity area appeared on T1-weighted images.This latter intensity gradually subsided and was replaced by a low intensity area on T2-weighted images.We suggest that these high signal intensity areas on the T1-weighted images in cerebral infarction are caused by hemorrhagic changes at the periphery of the infarction,where blood flow is restored by recanalization or collateral supply. |
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cerebral infarction
cerebral infarction,hemorrhagic
cerebrovascular accident
intracerebral hemorrhage
MRI
MRI,abnormal
MRI,cerebrovascular disease
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