This confirms previous works in this area that found the same problem in the "ectopic b-cells follicles".
The authors of the article propose a model about how lesions develop in this context.

Source:
Massive intracerebral Epstein-Barr virus reactivation in lethal multiple sclerosis relapse after natalizumab withdrawal
http://www.sciencedirect.com/science/ar ... 2817300553
Edit: I have put more information about the subject in the subforum of pathogenesis:
http://www.thisisms.com/forum/ms-etiolo ... 28881.html