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Histopathology showed small tumor cells without cell adhesion or tissue structure proliferation (A), and HE immunochemical staining was positive for B-cell markers CD20 and CD79a (B, C), compatible with the diagnosis of diffuse large B-cell non-Hodgkin lymphoma. HE immunochemical staining confirmed a proliferative index of over 50–60% (D). (A–C ×400; D ×200).
Abbreviation: HE, hematoxylin and eosin.
