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Metastatic renal cell carcinoma. a) Cluster of round cells, with uniform nuclei and vacuolated cytoplasm with ‘punched out’ holes (40×, Diff-Quik stain), b) Large, cohesive clusters of uniform epithelial cells are seen traveling with endothelial cells and stromal components (40×, Papanicolaou stain), c) An RCC immunostain is focally expressed, supporting the diagnosis of metastatic renal cell carcinoma (40×, immuno)
