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The A8344G mitochondrial DNA (mtDNA) mutation is best known for the MERRF phenotype (myoclonic epilepsy, myopathy, and ragged red fibers). We describe a sporadic case of an infant with the A8344G mtDNA mutation who presented with failure to thrive and sudden unexpected death at 11 months of age. The autopsy revealed a histiocytoid cardiomyopathy, diffuse steatosis of the liver, and bilateral retinal...