The prognosis is very poor. Two studies reported typical age of deaths in infancy or early childhood, with the first reporting a median age of death of 2.6 for boys and less than 1 month for girls.
Glycine encephalopathy
Toxic encephalopathy
Ethylmalonic encephalopathy
Wernicke encephalopathy
Post-encephalitic parkinsonism
Early myoclonic encephalopathy
Carbamate poisoning
Viral encephalitis