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Primary cardiac diffuse large B‐cell lymphoma. (A) The tumor shows sheets of cells with large atypical nuclei and prominent nucleoli (HE, 400× magnification). (B) The tumor cells show diffuse and strong staining for CD20 (CD20 IHC, 400× magnification) and positive staining for the proliferation marker Ki‐67 in 75% of the cells (not shown). Abbreviations: HE, hematoxylin and eosin stain; IHC, immunohistochemical stain.
