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Histopathological feature. (a) H and E: Diffuse infiltration of atypical centroblast-type lymphoid cells. (b) The atypical centroblast-type lymphoid cells are positive for B-cell marker CD20. In addition, brown is positive membranous staining. (c) STAT6: Immunocytochemistry shows that every tumor cells express the STAT6 protein. Brown is positive staining. CD20: Cluster of differentiate 20, STAT6: Signal transducer and activator of transcription 6
