Slowly progressive neuromuscular symptoms often have a genetic basis. We present the case of a woman in her 40s with gradually progressive symmetrical weakness and respiratory muscle involvement. Extensive investigation found no specific cause. After a novel neuromuscular gene panel became available, we identified a mutation in the MUSK gene (muscle-specific kinase), confirming a diagnosis of congenital myasthenic syndrome. This group of rare disorders are caused by mutations in genes encoding the neuromuscular junction.
Data availability statement
Data sharing not applicable as no datasets generated and/or analysed for this study.
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