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Most of the lesions examined in both cases exhibited evidence of low\u2010grade active demyelination of an unusual type (frustrated phagocytosis) in periplaque white matter. This included linear groups of microglia engaging short segments of disrupted myelin that were associated with deposits of C3d, an opsonin formed during complement activation. Similar microglia\/C3d\/myelin profiles were not observed in newly forming lesions in cases of acute multiple sclerosis or other central white matter diseases. As C3d coupling is known to increase the immunogenicity of potential antigens enormously, present findings point to disrupted myelin close to plaques as a possible source of the putative multiple sclerosis antigen. Ongoing myelin destruction found in a high proportion of old, established plaques was surprising. It suggests that slowly expanding lesions (progressive plaques), in which ongoing myelin breakdown occurs in the absence of florid perivascular cell cuffing or other histological signs of acute inflammation, contribute to disease progression in cases of secondary\u2010progressive multiple sclerosis.<\/jats:p>","DOI":"10.1002\/ana.1255","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T04:51:41Z","timestamp":1030251101000},"page":"646-657","source":"Crossref","is-referenced-by-count":401,"title":["Immunopathology of secondary\u2010progressive multiple sclerosis"],"prefix":"10.1002","volume":"50","author":[{"given":"John W.","family":"Prineas","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eunice 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