lissencephaly type 3

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lissencephaly type 3

A hereditary brain disorder (OMIM:611603) characterised by a smooth brain surface due to the absence (agyria) or reduction (pachygyria) of the cerebral gyri (surface convolutions); laminar heterotopia, usually associated with psychomotor retardation; severe mental retardation; variable presence of seizures; and defects of the corpus callosum, hippocampus, cerebellar vermis and brainstem.