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A large B-cell lymphoma usually presenting as a serous effusion without detectable tumor masses. It is universally associated with human herpes virus 8 (HHV8), also called Kaposi sarcoma-associated herpesvirus. It mostly occurs in the setting of immunodeficiency. The most common sites of involvement are the pleural, pericardial, and peritoneal cavities. Rare HHV8-positive lymphomas indistinguishable from primary effusion lymphomas (PEL) present as solid tumor masses, and have been termed extracavitary PEL. The prognosis is extremely unfavorable. (WHO 2017)
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