A rare genetic syndromic intellectual disability characterized by infantile or childhood onset of mild to profound developmental delay and intellectual disability in all affected individuals, as well as variable occurrence of epilepsy, autism spectrum disorder/behavioral issues, microcephaly, muscle tone abnormalities such as hypotonia and spasticity, dystonic, dyskinetic or choreiform movement disorder and cortical visual impairment. Brain MRI may reveal abnormal cortical development, hypoplastic corpus callosum, enlarged or dysplastic basal ganglia and hippocampal dysplasia. [from
SNOMEDCT_US]