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Definition

A metabolic disorder that causes a neuro-ophthalmologic syndrome consisting of early-onset bilateral optic atrophy, spasticity, extrapyramidal dysfunction and cognitive deficit. Urinary excretion of 3-methylglutaconic acid and 3-methylglutaric acid is increased. MGA3 can be distinguished from MGA1 by the absence of increase of 3-hydroxyisovaleric acid levels.

Acronym

MGA3

Synonyms

3-alpha-methylglutaconic aciduria type 3
Costeff optic atrophy syndrome
Costeff syndrome
MGA type III
MGCA3
Optic atrophy 3 autosomal recessive
Optic atrophy plus syndrome