The authors report two cases of multiple sclerosis occurring in very y
oung children. Age at onset in one child was 13 months; he had the pri
mary progressive form of the condition and died at nine years. Age at
onset of the other child was two years; he has the classical relapsing
-remitting form and is well at 15 years. These children illustrate the
broad clinical spectrum of the condition even in very-early-onset dis
ease.