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Figure 1.   Diffuse large cell lymphoma in a 38-year-old woman. Photograph of a gross specimen reveals a large, fleshy yellow tumor arising from the superior pole of the kidney (arrow). Small retroperitoneal and pelvic lymph nodes were also present at surgery. Immunohistochemical analysis of the renal mass demonstrated a staining pattern consistent with a lymphoma of B-cell origin, the most common type of lymphoma involving the kidney.