Which type of spinal muscular atrophy is characterized by muscle weakness that develops in children aged 6 to 12 months?
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Type 0 is apparent before birth, type I (Werdnig-Hoffmann disease) is apparent at or soon after birth, type III (Kugelberg-Welander disease) is seen after early childhood, and type IV begins in early adulthood.
For more on spinal muscular atrophy from the National Library of Medicine, visit the National Institutes of Health’s website. For more neurology content, visit the Specialty Site.
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