Transvenous right ventricular endomyocardial biopsy in a pediatric patient with skeletal myopathy and cardiomyopathy revealed unique ring-shaped mitochondria and increased mitochondrial size and number.
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Should not yet change practice; hypothesis-generating for ring-shaped mitochondria as a novel feature in pediatric cardiomyopathy.
Mackay et al. (1976) studied this question.
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