What are the types of spinal muscle atrophy (SMA)?
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What are the types of spinal muscle atrophy (SMA)?
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@quenby SMA is commonly divided into four types on the basis of the patient's age at onset and the highest physical milestone achieved, as follows:
Type I (Werdnig-Hoffmann disease) - Onset between birth and age 6 months
Type II - Onset between the ages of 6 and 12 months
Type III (Kugelberg-Welander disease) - Onset between the ages of 2 and 15 years
Type IV - Adult onset