| Phenotype details |
Prenatal development: unremarkable; developmental delay, intellectual disability ; no microcephaly; no short stature; age at sitting: not achieved; age at walking: not achieved; age at talking & current speech:not achieved; dysmorphic features: none; neurologic & behavioral problems: seizures infantile spasms limb hypertonia; electroencephalogram: consistent with early myoclonic epileptic encephalopathy; brain magnetic resonance: abnormal autopsy findings volume loss along the white matter adjacent to the atria and frontal horns of the ventricle, atrophy of pons and brainstem, bilateral subdural fluid collection; visual abnormalities: optic atrophy nystagmus; other abnormalities: feeding difficulty, gastroesophageal reflux disease, small umbilical hernia, laryngotracheomalacia |