Benign infantile mitochondrial myopathy due to reversible cytochrome c oxidase deficiency

A 2‐week‐old boy had profound generalized weakness, hypotonia, hyporeflexia, macroglossia, and severe lactic acidosis. The infant improved spontaneously: he held his head at 4 1/2 months, rolled over at 7 months, and walked by 16 months. At 33 month of age, he had mild proximal weakness. Macroglossi...

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