T CELL-RICH B CELL LYMPHOMA BEARING EPSTEIN-BARR VIRUS IN TUMOR CELLS : A CASE OF IBL-T-LIKE LESION FOLLOWING LENNERT'S LESION

A case of T cell-rich B cell lymphoma (TCRBCL) with Epstein-Barr virus (EBV) infection in tumor cells is reported. A 50 year old male developed right cervical lymph node swelling in July 1988. Initial biopsy in April 1989 demonstrated many scattered Hodgkinoid atypical cells with Lennert's lesion. After partial remission following chemotherapy, the lymph nodes enlarged again, and a second biopsy in February 1991 showed an IBL-T-like lesion. Only a small number of Hodgkinoid atypical cells were still observed. After apparently, complete remission, the lesion soon recurred and the patient died in November 1992. Immunohistochemically the Hodgkinoid cells were positive for L26, but negative for LN2, LN3, UCHL-1, MT1, lysozyme, Ber-H2 and Leu-M1. Reactivity for immunoglobulins showed falsepositive because of poly-clonal staining. IgH monoclonality was detected by the poly-merase chain reaction method in the first biopsied specimen, and by Southern blotting in the second biopsied snap-frozen specimen. Monoclonal TCRβ rearrangement was not detected. The Hodgkinoid atypical cells were positive for EBVencoding RNA by in situ hybridization, and LMP-1 by immunostaining. Occasionally, EBV-bearing immunoblastic, medium sized, or small lymphocytic cells were also observed. This case indicates the possibility that EBV is related to the pathogenesis of TCRBCL.