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要旨 ギラン・バレー症候群様の経過で発症し,比較的慢性の経過をとった純粋運動ニューロパチーの34歳男性例を報告した。深部反射は正常で,筋脱力の分布は不均一であり,多発単神経炎を考えさせる臨床像を呈した。電気生理学的にはCMAPの著明な低下がみられ左右差も認められた。抗GalNAc-GD1a-IgM抗体が持続陽性であった。本例は,抗GalNAc-GD1a-IgM抗体の炎症性ニューロパチーにおける病因的役割を考える上で興味深い症例と考えられた。
The patient was a 34-year-old male with chronic pure motor neuropathy with such acute onset as seen in Guillain-Barré syndrome. Neurological symptoms were gradually progressive for 4 weeks, and predominantly noted in the left side. Deep reflexes were normal and the distribution of muscle weakness was uneven. Plasma exchange reduced neurological symptoms. Four weeks later, right drop foot was relapsed. High dose intravenous immunoglobulin was effective. Serial electrophysiological studies indicated the asymmetric reduction of CMAP. Repeated assays of anti-GalNAc-GD1a IgM antibody were positive. This is the first report of chronic pure motor neuropathy as multiple mononeuritic type associated with anti-GalNAc-GD1a IgM antibody. This case adds to our knowledge better understanding of the pathogenetic role of anti-GalNAc-GD1a IgM antibody in inflammatory neuropathies.
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