“…For this reason, the differential diagnosis in severely immunosuppressed patients suspected of having VRL should include infections known to occur in those with acquired immune deficiency syndrome (AIDS) -most notably cytomegalovirus (CMV), syphilis, and toxoplasmosis. 26,27 Many HIV-infected patients with PCNSL, and again by extension VRL, have active Epstein-Bar virus (EBV) infectionpresumably related to relative loss of EBV suppressing CD4 + T-cells. In addition to the diagnostic studies mentioned above by Carbonell et al, 12 Steffen et al 13 noted that testing of tissue or fluid samples for the presence of EBV DNA may have value.…”