ICD-11 definition : Guanidinoacetate methyltransferase deficiency is an inborn error of creatine synthesis
with variable clinical phenotype including a spectrum of neurological involvement
from progressive extrapyramidal movement disorder and severe muscular hypotonia, to
epilepsy and intellectual development disorder.;
Guanidinoacetate methyltransferase deficiency is an inborn error of creatine synthesis
with variable clinical phenotype including a spectrum of neurological involvement
from progressive extrapyramidal movement disorder and severe muscular hypotonia, to
epilepsy and intellectual development disorder.