Relapsing-remitting MS describes disease relapses with full or partial recovery. The periods between relapses are characterized by a lack of disease progression. Patients with primary-progressive MS experience disease progression from disease onset, with occasional, temporary, and minor episodes of improvement. Progressive-relapsing MS is a progressive disease from disease onset, but there are clear acute relapses with or without recovery. The periods between relapses are accompanied by disease progression. Secondary-progressive MS begins with a relapsing-remitting course followed by progression with or without occasional relapses without full recovery.3
3. Keegan BM, Noseworthy JH. Multiple sclerosis. Annu Rev Med 2002;53:285-302.
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