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Multiple sclerosis with onset of cerebellar ataxia in an 18‐month‐old girl

Multiple sclerosis (MS) is an autoimmune inflammatory disease of the central nervous system (CNS) that is primarily a disease of young adulthood. 1 Onset before 10 years of age is considered unusual, 2 and occurs in only 0.2–0.7% of all patients. 3 Onset before 24 months of age is extremely rare and only five patients have been reported. 4–8 Extremely early onset of MS is reportedly associated with an unfavorable prognosis. 3