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Clear cell papillary renal cell carcinoma in native kidneys of a renal transplant recipient. (a) Single layers of clear cells with moderate amount of clear cytoplasm and pyknotic nuclei oriented toward the apical surfaces, H&E 400×; (b) diffuse CK7 positivity, 100×; (c) weak CD10 stain, 100×; (d) negative RCC stain, 100×.
