Primary effusion lymphoma in human immune deficiency (HIV)-negative non-organ transplant immunocompetent patients.

Primary effusion lymphoma (PEL) is a rare non-Hodgkin's lymphoma most commonly occurring in the context of human immune deficiency (HIV) infection. Herpes virus 8 (HHV-8) has been associated with PEL and considered to be the etiologic agent. In addition, most cases (60%-90%) also show evidence of Epstein-Barr virus (EBV) infection. We describe here an elderly man who was HIV seronegative and immunocompetent, and presented with worsening weakness and ascites. The diagnosis of PEL was rendered cytologically and supported by the results of flow cytometry. The presence of HHV-8 was demonstrated by immunohistochemistry, whereas EBV-associated genetic material was absent by EBER ISH. No lymphadenopathy or organ involvement with lymphoma was found. Systemic chemotherapy with lenalidomide was started given the poor prognosis and commodities of severe coronary artery disease; however, the patient did not respond and succumbed to his disease in 4 months. We present detailed cytologic and clinical findings of this very rare occurrence, and review literature of all reported PEL cases of HIV-negative, nontransplant, immunocompetent patients.