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An autosomal recessive disease with variable manifestations. Main features are brain malformations with calcifying leukoencephalopathy, progressive neurodegeneration, and bone sclerotic features. The age at onset ranges from infancy to early adulthood. Neurologic features include loss of previous motor and language skills, cognitive impairment, spasticity, and focal seizures. Brain imaging shows periventricular white matter abnormalities and calcifications, large cisterna magna or Dandy-Walker malformation, and sometimes agenesis of the corpus callosum.






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