Primary effusion lymphoma (PEL) is a large B-cell lymphoma that only proliferates proliferating effusion in the body cavity. It is associated with human herpesvirus 8 (HHV8).HHV8 negative effusion lymphoma, which is different from PEL in many ways, has also been reported and is referred to as HHV8-unrelated PEL-like lymphoma. This lymphoma is very rare and its clinical characteristics have not been fully clarified.A 79-year-old male developed HHV8-negative primary effusion lymphoma during treatment for myelodysplastic syndrome.Abdominal computed tomography revealed abdominal effusion, but did not show any evidence of a tumor mass or lymph node enlargement. A cytological analysis of his pleural effusion revealed atypical lymphoid cells that were negative for CD10, and positive for CD19 and CD20. Corticosteroids were administered to treat the abdominal effusion; however, the patient died of an exacerbation of lymphoma on the 20th day after the initiation of corticosteroid therapy. We herein report the case of an HIV seronegative elderly patient with HHV8-unrelated PEL-like lymphoma.
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