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We present the case of a 49-year-old patient who debuted with B symptoms, neurological involvement, diffuse lymphadenopathy, and autoimmune hemolytic anemia due to warm antibodies. With a wide differential diagnosis, an excisional biopsy of the axillary lymph nodes was performed, reaching the histological diagnosis of Multicenter Castleman's disease with the presence of DNA from Hhuman Hherpesvirus--8 in plasma determined by quantitative polymerase chain reaction (PCR). The patient was managed with chemotherapy composed of rituximab, liposomal doxorubicin, cyclophosphamide, vincristinevincristine, and dexamethasone with excellent therapeutic response.