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Splenic marginal zone lymphoma. (A) Low power of spleen with prominent follicles, H&E, 20×; (B) Atypical follicle comprised of small lymphocytes, H&E, 100×; (C) High power of plasmacytic lymphocytes, H&E, 400×; (D) Immunohistochemistry showing CD20 positivity. CD5 and CD10 are negative (not shown).
