Primary cutaneous Epstein-Barr virus-positive diffuse large B-cell lymphoma, not otherwise specified, in a nonimmunocompromised young man: A case report.

Primary cutaneous EBV (Epstein-Barr virus)-positive diffuse large B-cell lymphoma, not otherwise specified (DLBCL, NOS), is an extremely rare disease. The clinical and pathological features of DLBCL, NOS have not been clearly illustrated. We report a case of primary cutaneous EBV-positive DLBCL, NOS in a 35-year-old Chinese male with multiple ulcerated and nodular lesions on his trunk and arms for 6 months. No other organs, except the skin, were involved. The lesions were localized in the dermis with focal necrosis. The tumor cells were immunoblastic- or centroblastic-like cells and diffusely distributed. There were numerous inflammatory cells in the background. The tumor cells were positive for CD20, PAX-5, MUM1, LMP1, CD30, and Epstein-Barr virus encodedsmall RNA, but negative for EBNA2. Polymerase chain reaction showed a monoclonal IG gene rearrangement. The patient received 6 cycles of CHOP (cyclophosphamide, hydroxydaunorubicin, Oncovin®, prednisone) chemotherapy and went into complete remission. There was no evidence of relapse after 35 months of follow-up.