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A 6-month-old male is admitted to the ED for acute respiratory failure. On examination, he has generalized weakness, diffuse hypotonia, and areflexia. He was admitted to the pediatric Intensive Care Unit and intubated. A chest X-ray showed a narrow chest. EMG/NCS was performed showing axonal motor polyneuropathy with tongue fasciculations and signs of chronic denervation. What is the most likely pathologic etiology causing this presentation?