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Histopathological and immunohistochemical findings of PCFCL. (A), Dermal lymphoid infiltrate with diffuse and nodular growth pattern (H&E ×20); (B), Tumor cells showing strong and diffuse positive staining for CD20 (CD20 ×20); (C), Negativity or focal weak positive staining for CD10 (CD10 ×40); (D), Tumor cells stained positive for CD23 (CD ×20); (E), Tumor cells stained positive for BCL-6 (BCL ×40); (F), Reduced expression of ki-67 proliferation index in the nodules (Ki67 ×20).
