| Phenotype details |
Global developmental delay (cannot hold head up or sit up), microcephaly, infantile spasms, cortical visual impairment, West Syndrome, increased nuchal fold prenatally, history of sinus bradycardia, CSF abnormalities in neurotransmitter metabolites, periventricular calcifications, cereberal atrophy with prominet white matter loss, elevated choline and low N-acetylaspartatate in inferior, frontal, temporal, and parietal lobes bilaterally. Elevated startle reflex, involuntary movements. |