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Abstract

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Purpose : To determine by means of MR imaging the ischemic status of parenchymal
lesions in moyamoya disease.
Materials and Methods : Ninety-two MR images in 50 children with moyamoya disease
were retrospectively reviewed. Ischemic parenchymal lesions were categorized according
to the signal intensities of cortex and subcortical white matter. We also analyzed
enhancement patterns, time sequential changes in the lesions, and the Prognosis for each
patient, according to lesion type.
Results : Among one hundred and seventeen parenchymal abnormalities, 89 gyral lesions
were seen in 43 children (86%), predominantly in the frontal area (33.1%). Cortical
parenchyaml lesions were categorized as either type I-intermediate to high signal
intensity (SI) on both T2 weighted (T2WI) and proton density images (PDI), and
associated with low SI of the subcortical white matter; type II - high SI on T2WI and
PDI, without low Si of the subcortical white matter; or type III - high SI on T2WI and
iso SI on PDI. Thirty-three lesions were type I, ten were type II, and 43 were type III.
Time sequential changes from type I to type II, and then to type III, were observed.
The prognoses of patients with a type-I lesion were better than those of patients whose
lesions were type II or III.
Conclusion : Type I lesions presented with abnormal low signal intensity in the
subcortical white matter, as seen on T2WI images. This was the characteristic and
earliest finding of ischemic parenchymal lesions in moyamoya disease; sequential MR
images showed that type-I lesions profressed to type II or III.

Å°¿öµå

Children central nervous system; Moyamoya disease; Brain ischemia; Brain MR;

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