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Primary cutaneous diffuse large B-cell lymphoma, ‘leg type’. The section is from a large ulcerating mass on the lower limb. There is a diffuse infiltrate of large lymphoid cells with oval nuclei. Immunoperoxidase stain for IRF4/MUM1 is positive. Left: Hematoxylin and eosin, original × 400, Right immunoperoxidase stain for IRF4/MUM1, hematoxylin counterstain.
