An Unusual Case of Extracavitary/Solid Variant Primary Effusion Lymphoma With Associated Hemophagocytic Lymphohistiocytosis.

Primary effusion lymphoma (PEL) is a rare, aggressive large B-cell lymphoma variant that is invariably associated with human herpesvirus 8 (HHV8), predominantly in human immunodeficiency virus (HIV)-infected patients, and its oncogenicity is often augmented by coinfection with Epstein-Barr virus. It typically presents as a serous effusion in body cavities without detectable solid tumors. The extracavitary variant of PEL may represent a diagnostic challenge.