ArticleCureus2026
Atypical Multifocal Motor Neuropathy Presenting With Isolated Spinal Accessory and Pectoral Nerve Involvement.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Authors and funding
3 authors.
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Abstract
Multifocal motor neuropathy (MMN) is a rare, immune-mediated disorder typically characterized by slowly progressive, asymmetric distal limb weakness. Cranial nerve involvement is distinctly uncommon, and isolated involvement of the spinal accessory nerve (CN XI) is exceedingly rare. We present the case of a 68-year-old male patient who presented with severe neck and shoulder wasting and a profound head drop. Despite the fact that standard conduction studies failed to demonstrate classic motor conduction blocks due to the highly proximal nature of the nerve involvement, a clinical diagnosis of MMN was suspected based on the asymmetric motor-only presentation, elevated Anti-GM1 antibodies, and steroid nonresponsiveness. The patient showed a robust and sustained functional recovery following treatment with intravenous immunoglobulin (IVIG), highlighting the importance of clinical judgment in atypical presentations of treatable neuropathies.
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