T-cell/histiocyte-rich diffuse large B-cell lymphoma is characterized by abundant reactive T-cell and histio-cyte infiltration within nodal diffuse large B-cell lymphoma, and only limited cases of primary cutaneous T-cell-rich B-cell lymphoma have been documented. These reactive T-cells usually show a T-helper phenotype. Gamma/delta T-cell is a functionally distinct T-cell lineage, which constitutes on average 5% of all T-cells in the peripheral blood. Herein, we report the first documented

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... of primary cutaneous malignant B-cell lymphoma with abundant reac-tive gamma/delta + T-cells within the skin lesion and peripheral blood. An 80-year-old Japanese male presented with a gradually enlarged knee nodule. Histopathological study revealed diffuse infiltration of lymphoid cells in the dermis and subcutis. Proliferation of large-sized atypical lymphoid cells was observed among medium-sized lym-phocytes with convoluted nuclei. Immunohistochemically, these large-sized atypical lymphocytes were CD20 + , and relatively many gamma/delta + cell infiltration was also noted. Flowcytometric analysis revealed deviation of lambda + cells (lambda/kappa 58) and increase of CD3 + gamma/delta + cells (6%). Peripheral blood had CD3 + gamma/delta + cells (28.8%). Rearrangement of immunoglobulin heavy chain, but not of T-cell receptor beta and gamma chains, was observed. Accordingly, an ultimate diagnosis of cutaneous B-cell lymphoma with abundant reactive gamma/ delta + cells was made. Recent studies have shown reactive gamma/delta + T-cell infiltration and/or elevation in the peripheral blood in patients with various types of carcinoma, and that they play a role in the pathogenesis of some carcinomas. Therefore, additional analysis is needed to clarify the role of reactive gamma/delta + T-cells in malignant lymphoma.