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Metastatic renal cell carcinoma to thyroid. (a) Tumor cells with abundant clear, vacuolated cytoplasm, and enlarged hyperchromatic nuclei on rapid on-site evaluation imprint cytology (×1000, Diff-Quik). (b) Partially denuded tumor nuclei amidst a background of abundant clear extracellular vacuoles (×1000, Diff-Quik). (c) Core needle biopsy showing metastatic clear cell renal carcinoma (×400, H and E) with positive CD10 (d), PAX2 (e), and RCC (f) (×200)
