Archivos españoles de urología
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To report a clear cell renal cell carcinoma recipient of a metastasizing ductal carcinoma of the breast: A tumor-to-tumor metastasis. ⋯ Awareness of this phenomenon should always be kept in mind by urologist in patients with a known history of a previous malignancy and by pathologists when finding a renal tumor with an unusual or dimorphic morphology. Immunohistochemistry plays an important role to establish the exact diagnosis.