title: Extracavitary/solid variant of primary effusion lymphoma.
abstract: Primary effusion lymphoma (PEL) is a distinct clinicopathologic entity associated with human herpesvirus 8 (HHV8) infection that mostly affects patients with immunodeficiency. Primary effusion lymphoma usually presents as a malignant effusion involving the pleural, peritoneal, and/or pericardial cavities without a tumor mass. Rare cases of HHV8-positive lymphoma with features similar to PEL can present as tumor masses in the absence of cavity effusions and are considered to represent an extracavitary or solid variant of PEL. Here, we report 3 cases of extracavitary PEL arising in human immunodeficiency virus-infected men. Two patients had lymphadenopathy and underwent lymph node biopsy. One patient had a mass involving the ileum and ascending colon. In lymph nodes, the tumor was predominantly sinusoidal. The tumor involving the ileum and ascending colon presented as 2 masses, 12.5 × 10.6 × 2.6 cm in the colon and 3.6 × 2.7 × 1.9 cm in the ileum. In each case, the neoplasms were composed of large anaplastic cells, and 2 cases had "hallmark cells." Immunohistochemistry showed that all cases were positive for HHV8 and CD138. One case also expressed CD4 and CD30, and 1 case was positive for Epstein-Barr virus-encoded RNA. Evidence of B-cell differentiation was poorly developed in all tumors. These cases highlight the importance of assessing HHV8 in an anaplastic tumor that arises in a human immunodeficiency virus-positive patient and further contributes to the limited literature currently available for extracavitary PEL.
authors.affiliation: Department of Hematopathology, The University of Texas, MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Yoonjung
authors.initials: Y
authors.lastname: Kim
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Leventaki
authors.forename: Feriyl
authors.initials: F
authors.lastname: Bhaijee
authors.forename: Courtney C
authors.initials: CC
authors.lastname: Jackson
authors.forename: L Jeffrey
authors.initials: LJ
authors.lastname: Medeiros
authors.forename: Francisco
authors.initials: F
authors.lastname: Vega
mesh_terms: D000328:Adult; D014408:Biomarkers, Tumor / Q000378:metabolism*; D001706:Biopsy; D044682:Colon, Ascending / Q000473:pathology; D003937:Diagnosis, Differential; D020031:Epstein-Barr Virus Infections / Q000150:complications / Q000821:virology; D006678:HIV / Q000302:isolation & purification; D015658:HIV Infections / Q000150:complications* / Q000821:virology; D006679:HIV Seropositivity; D004854:Herpesvirus 4, Human / Q000302:isolation & purification; D019288:Herpesvirus 8, Human / Q000302:isolation & purification*; D006801:Humans; D007082:Ileum / Q000473:pathology; D016130:Immunophenotyping; D008198:Lymph Nodes / Q000473:pathology; D017728:Lymphoma, Large-Cell, Anaplastic / Q000473:pathology; D054685:Lymphoma, Primary Effusion / Q000150:complications / Q000378:metabolism / Q000473:pathology* / Q000821:virology; D008297:Male; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor