Case reports of ADHD in a child with a metabolic disorder were found for 3-methylcrotonyl-CoA carboxylase deficiency [27], argininosuccinate lyase deficiency [28] and succinyl-CoA: 3-oxoacid CoA transferase deficiency [29]. The gene discussed is OXCT1; the disease is hyperinsulinemic hypoglycemia, familial, 4.