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Diffuse Large B-cell Lymphoma

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Primary renal lymphoma, diffuse large B-cell type, in a 56 y/o male forming a discrete 10 cm mass. The tumor was composed of CD19+, CD20+, and CD10+ B-lymphocytes that were monoclonal for lambda light chains. This case is unusual on two counts - 1) this is a primary renal lymphoma which is exceedingly rare, and 2) it is forming a discrete mass simulating renal cell carcinoma instead of diffusely infiltrating the renal parenchyma.

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