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We report the cases of 2 siblings with progressive encephalopathy. The first symptoms were noted when they were 6 years old. The full clinical picture included myoclonus, seizures, cerebellar ataxia, blindness due to optic atrophy and retinal degeneration, deafness, swallowing difficulties with relatively spared intellectual functions. The course was progressive and led to death within 8 years. The pathological findings included bilateral and almost symmetrical lesions involving the thalami, the colliculi, and the pontine and medullar tegmentum, similar to the changes described in Leigh disease. Neuronal loss and gliosis were noted in the dentate nucleus and in the inferior olive, as in MERRF syndrome. Laminar necrosis of the cerebral cortex could have been due to episodes of severe hypotension before death. Cytochrome c oxidase deficiency was found in case 2. The enzyme deficiency was present in muscle and in fibroblasts in culture.
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Rinsho shinkeigaku = Clinical neurology,
