Ataxia in cerebellar infarction. Recovery of ataxia and somatotopic localization in the cerebellum.

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  • 小脳・小脳脚梗塞における運動失調　運動失調の予後および小脳内体性局在について
  • Recovery of ataxia and somatotopic localization in the cerebellum
  • 運動失調の予後および小脳内体性局在について

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In 47 patients with infarction of the cerebellum and/or cerebellar peduncle (CP), outcome of ataxia and functional localization in the cerebellum were studied with analysis of clinical signs and magnetic resonance imaging (MRI). Cerebellar ataxia disappeared in 81% of the patients within 12 months from the stroke. Total involvement of the middle CP or combined involvement of the superior CP and dentate nucleus showed markedly poor recovery of limb ataxia, whereas ataxia in patients with lesion of the cerebellar cortex or inferior CP recovered well.<BR>Although no difference was observed between ataxia due to cerebellar afferent system (middle and inferior CP) and efferent system (superior CP) lesions, intention tremor or rhythmic skeletal myoclonus appeared later in the patients with the latter lesion.<BR>Ataxic dysarthria in upper cerebellar hemisphere lesion and ocular dysmetria in lower vermis or hemisphere lesion were frequently shown, whereas limb ataxia had no obvious correlation with the site of lesion. These results suggest that, in the cerebellum, somatotopic localization exists at least in coordination of arthria and eye movement.

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