The prognosis is usually poor. Mortality rate is high during<unk>  infancy and almost half of the children die by 2 years of age. Most of the survivors suffer from psychomotor impairment. In the patient with severe phenotype, even when optimal treatment is initiated promptly the prognosis remains poor.
Early myoclonic encephalopathy
Wernicke encephalopathy
Post-encephalitic parkinsonism
Powassan encephalitis
Ethylmalonic encephalopathy
Camel spongiform encephalopathy
Glycine encephalopathy
Autoimmune encephalitis