Primary effusion lymphoma with central nervous system involvement in an HIV-negative homosexual male

Primary effusion lymphoma (PEL) is a rare form of non-Hodgkin lymphoma that presents with body cavity effusions. It occurs chiefly in immunodeficient HIV-positive patients. The tumor cells generally express gene sequences of human herpesvirus-8 (HHV-8) and Epstein-Barr virus (EBV). Tumor cells of HIV-negative patients usually express HHV-8 gene sequences, but rarely those of EBV. We report a novel case of PEL in an HIV-negative homosexual male whose tumor cells expressed both HHV-8 and EBV gene sequences and who developed evidence of central nervous system involvement.