3-Methylglutaconic aciduria type I (3-MGA I) is a rare inherited disorder of the leucine metabolism pathway due to mutations in the AUH gene for 3-methylglutaconyl-CoA hydratase enzyme and enzyme deficiency. It has a variable phenotypic presentation from infancy to adulthood. Here, we report a three-year-old female patient with normal development presented with acute encephalopathy and status dystonicus. Neuroimaging was normal. Urine organic acid analysis showed high levels of 3-methylglutaconic acid, 3-hydroxyisovaleric acid. Next-generation sequencing revealed a novel homozygous mutation of variant c.505+1G>C (5' splice site) in intron 4 of the AUH gene that was compatible with the diagnosis of 3-MGA I. The child was asymptomatic on follow-up with a low leucine diet. Clinicians should suspect rare inherited metabolic disorders in acute onset unexplainable neurological symptoms and evaluate with urine organic acid analysis.
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