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== 3-Methylglutaconic aciduria == ...] metabolic disorders characterized by an increased urinary excretion of 3-methylglutaconic acid and 3-methylglutaric acid.

...s '''Optic Atrophy Plus Syndrome''' or '''3-Methylglutaconic Aciduria Type III''', is a rare genetic disorder characterized by early-onset optic atrophy, ...etic testing, and the presence of increased levels of a substance called 3-methylglutaconic acid in the urine.