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An autosomal dominant disorder characterized by hypomyelination, leukodystrophy, and thin corpus callosum observed on brain imaging. Clinical features include hypotonia, nystagmus, and mildly delayed motor development with onset in infancy, ataxic or broad-based gait, hyperreflexia, intention tremor, dysmetria, and a mild pyramidal syndrome. Some patients have cognitive impairment, whereas others may have normal cognition or mild intellectual disability with speech difficulties.






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