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The Authors present an additional case of a 70-years old male patient with skin metastasis from renal cell carcinoma, 15 months after nephrectomy. The patient died ten months later for advanced neoplastic disease. Skin metastasis affect 3-6% of patients with renal cell carcinoma. The surgical treatment is mandatory for single nodule. Chemotherapy is often ineffectual. The prognosis is poor, with a 0-8% 5-years survival for patients with multiple nodules.

A case of isolated mammary metastasis from surgically untreated urothelial vesical carcinoma is discussed. An integrated chemo-radiotherapeutical treatment had been planned, due to bad general condition; after this, an optimal subjective benefit and good objective response (reduction in lesion diameter50%, MR) were obtained. An isolated breast lesion appeared ten months after; its metastatic nature was only indirectly suspected by mammographic and echographic features. Only immunohistochemical study, realized on percutaneous needle biopsy specimen, definitively confirmed the urothelial metastatic origin. In present work, biological and prognostic significance of mammary metastases and the needing of distinguishing them from primary breast neoplasm are analysed, basing on the literature review.