ＭＲＩ上橋底部高信号の成因に関する検討

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  • Causative factors of high intensity areas identified by MRI in the pontine base.

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High intensity areas in the pontine base were found more frequently in patients of group A who had multiple supratentorial high intensity areas smaller than 15 mm in size and of group B whose vertebral arteries were asymmetric on MR angiography, as compared to those who had none of the above findings of MRI and MR angiography. The high intensity areas of group A were often found bilaterally in the upper pons and those of group B were present unilaterally in the lower pons. Pontine high intensity areas were found frequently on the same side as the smaller vertebral artery in group B. Periventricular hyperintensity was more severe in group A than in group B. These results suggest that high intensity lesions in the pontine base may conform with the following conditions : 1) multiple small high intensity areas in the supratentorium due to diffuse arteriosclerosis, and 2) asymmetry of the vertebral arteries inducing hemodynamic disorders.

収録刊行物

  • 脳卒中

    脳卒中 16 (4), 244-249, 1994

    一般社団法人 日本脳卒中学会

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