Fig. 5.
Meningoencephalitis and bone marrow lymphocytosis. a Meningeal lymphocytosis with b a predominantly CD8+ T-cell infiltrate as demonstrated by immunohistochemistry and c extension into the brain parenchyma; d Hypercellular bone marrow with e an increase in CD3+ and f CD8+ T-lymphocytes as detected by immunohistochemistry; scale bars as indicated