She underwent stereotactic biopsy of the right parietal region on 8/10/95 which on H&E and LFB stained sections revealed multiple discrete areas of demyelination, containing dense infiltrates of foamy macrophages in association with scattered large oligodendroglia with deeply basophilic, ground-glass nuclei, enlarged astrocytes, and sparse perivascular lymphocytic infiltrates. 
She underwent stereotactic biopsy of the right parietal region on 8/10/95 which on H&E and LFB stained sections revealed multiple discrete areas of demyelination , containing dense infiltrates of foamy macrophages in association with scattered large oligodendroglia with deeply basophilic , ground - glass nuclei , enlarged astrocytes , and sparse perivascular lymphocytic infiltrates .