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This article discusses a case study of a 50-year-old patient who developed symptoms of vitamin B12-responsive methylmalonic acidemia (MMA), a metabolic disorder, at an unusually advanced age. The patient experienced seizures, status epilepticus, leukoencephalopathy, and myelopathy. The article emphasizes the importance of considering inborn metabolic disorders as potential causes of neurological symptoms in adults, even if they present at an older age. The authors recommend conducting biochemical screening investigations and genetic testing to accurately diagnose these conditions. [Extracted from the article]