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Right renal mass histology. (A–B) Papillary renal cell carcinoma (H&E; original magnification; 2×; 40×). (C) Tumour cells positive for CK7 (CK7 IHC; original magnification; 2×) (D) Tumour cells positive for PAX8 (PAX8 IHC; original magnification; 20×). IHC, immunohistochemistry.
