Congenital myopathy with type II muscle fiber hypoplasia

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Abstract
We examined a 14-month-old boy with severe muscular hypotonia and weakness. Loss of tendon reflexes were noted at age 2 months. Right-sided heart failure and dyspnea during sleep developed at age 4 months. Muscle biopsy revealed selective hypoplasia of type II fibers and normal type I fibers. Intercostal and diaphragmatic muscles showed similar changes at necropsy and probably accented the respiratory failure.

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