Parietal Ataxia: 13 Cases Plus a Review of Relevant Literature

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  • FUTAMURA Akinori
    Department of Medicine, Division of Neurology, Showa University School of Medicine
  • KAWAMURA Mitsuru
    Department of Medicine, Division of Neurology, Showa University School of Medicine

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Parietal ataxia is a rare condition of hemi- or mono-ataxia caused by contralateral lesions in the parietal lobe. Parietal ataxia is categorized into sensory ataxia and pseudocerebellar ataxia, and is usually reported in single-case studies. Here we report 13 cases of hemi- or mono-ataxia caused by acute brain infarction in the parietal lobe, and discuss these cases with respect to past case studies and the MRI lesion visualizations. Patients with motor paresis were excluded from this study. Patients with sensory disturbance were categorized into a sensory ataxia group and pseudocerebellar ataxia group. Lesions on cranial MRI were classified as white matter inferior to the posterior central gyrus, posterior central gyrus, or superior or inferior parietal lobules. Six patients in the sensory ataxia group showed lesions in the gray or white matter of the posterior central gyrus. We found that parietal ataxia patients showed a high rate of decomposition and slowness in the finger-nose test and decomposition in diadochokinesis. Oscillation in the finger-nose test and slowness in diadochokinesis were more frequently observed in the patients with sensory ataxia than in those with pseudocerebellar ataxia, although the difference was not lesion dependent. This study thus found clinical differences between the sensory ataxia and pseudocerebellar ataxia groups of patients with parietal ataxia.

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