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A 20-year-old man presented with a 6-month history of progressive weakness in the right hand.
Neurological examination showed a bilateral weakness of hand muscles more pronounced in the right hand, slight scapula winging and no sensory disturbances. Nerve conduction studies showed motor conduction blocks in the median and ulnar nerves bilaterally (figure 1), with normal sensory conduction studies, suggesting a motor multifocal neuropathy (MMN). Somatosensory evoked potentials from …