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A rare genetic subtype of non-syndromic pontocerebellar hypoplasia with characteristics of progressive cerebellum and brainstem atrophy, corpus callosum hypo/aplasia and progressive post-natal microcephaly. Patients typically present profound global developmental delay, spastic tetraparesis, seizures, cortical visual impairment and on neuroimaging abnormal brain morphology that includes pontocerebellar hypoplasia, \'\'figure of 8\'\' midbrain appearance and more variably interhemispheric cysts, ventriculomegaly and cerebral dysmyelination. There is evidence the disease is caused by homozygous mutation in the AMPD2 gene on chromosome 1p13.
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