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Histological aspect of primary cutaneous marginal zone B-cell lymphoma, “class-switched.” (a) Dense nodular periadnexial and perivascular infiltrate throughout dermis ad subcutis, surrounding and partially colonizing reactive lymphoid germinal centers. (b) The infiltrate consists of small B-cells, with lymphoplasmacytoid and plasma cells appearance. Primary cutaneous marginal zone B-cell lymphoma, “class-switched” tumor strongly express IgM, are CD20+ CD79+, BCL-2+, but BCL-6
