A Case of Maple Syrup Urine Disease Diagnosed in Adulthood

Abstract

Classic maple syrup urine disease (MSUD) is typically diagnosed in newborns, whereas nonclassic forms may manifest at any age. We describe a 58-year-old man presenting with recurrent encephalopathy, found with a nonclassic form of MSUD. This patient case highlights the importance of considering inborn errors of metabolism in the differential diagnosis of adult patients presenting with neurologic symptoms of unclear cause.