2. Chronic Progressive (Secondary progressive) After a period of time, relapsing and remitting MS attacks are followed by incomplete recovery and cumulative loss of function and disability. At any one time, the chronic progressive stage accounts for 20% of all sufferers. Converting from relapsing and remitting to secondary progressive occurs on average 6-10 years after the initial symptoms.
3. Chronic Progressive from onset (Primary progressive) This form is common in late onset MS ( > 45 yrs) and accounts for 15% of all patients. Symptoms and signs are usually spinal and relapses barely noticeable in the context of insidious progression.
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