Abstract
Multifocal motor neuropathy (MMN), an acquired chronic progressive immune-mediated motor neuropathy, is characterized by asymmetrical distal upper limb muscle weakness and muscle atrophy without sensory impairment. Differentiation from amyotrophic lateral sclerosis is usually challenging, and electrophysiological studies show multifocal conduction blocks. Immunoglobulin (Ig)M GM1 antibodies are detected in approximately 50% of patients. In contrast to chronic inflammatory demyelinating polyneuropathy, corticosteroids are ineffective for management of MMN, and IVIg is the sole established treatment.
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