多巣性運動性ニューロパチー(multifocal motor neuropathy:MMN)は,感覚障害を伴わない左右非対称性,上肢遠位優位の筋力低下,筋萎縮を主徴とする後天性の慢性脱髄性末梢神経疾患である.病態は明らかではないが,MMN症例の約半数に抗ガングリオシドIgM型GM1抗体が検出され,何らかの自己免疫性の機序が想定されている.
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