IT IS generally held that X-linked muscular dystrophy occurs in two forms, mild and severe. The two disorders, however, are not easily distinguished, and we need to know on what basis an individual case can best be assigned to one category or the other. There is no effective therapy, and the victims go unremittingly downhill to death. Since some are only mildly affected and live for many years while others never live to enter their second decade, accurate statements of prognosis are very much to be desired. Equally important are statements of risk to other family members, especially asymptomatic brothers and brothers yet to be born.
The objectives of the present paper are accordingly to show (1) the existence of two types as well as the progression and prognosis characteristic of each, (2) how individuals can best be assigned to one group or the other, and (3) how statements of
Shaw RF, Dreifuss FE. Mild and Severe Forms of X-Linked Muscular Dystrophy. Arch Neurol. 1969;20(5):451–460. doi:10.1001/archneur.1969.00480110015001
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