Multiple sclerosis is characterized by recurrent neurologicevents (clinical relapses) that are attributable to multifocallesions within the central nervous system. Lesions referredto as "active plaques" are characterized by the presence ofinflammation and active myelin degradation and phagocytosis.These lesions have been subtyped according to the relative presenceof immunoglobulin (i.e., antibodies) and according to whetherthe primary injury is directed at the myelin itself or its cellof origin, the oligodendrocyte. Pathological and magnetic resonanceimaging (MRI) studies show that axonal injury occurs early inthe course of disease. The potential for remyelination is greatestat this . . . [Full Text of this Article]
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From the Montreal Neurological Institute, McGill University, Montreal.
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