Abstract
A typical case of oculopharyngeal muscular dystrophy is reported. On electron microscopic study of a deltoid muscle biopsy, abnormal mitochondria and “fingerprint” inclusions were observed in numerous muscle fibers. The inclusions were composed of concentric lamellae of short electron-dense linear elements. Identical structures have been reported in three other myopathic disorders so that they cannot be regarded as a specific morphologic feature.
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