[Breast metastasis of kidney cancer. Diagnostic and therapeutic features]

The breast is a rare site of metastasis from renal cancer and the preoperative diagnosis is often difficult. The treatment recommended for this type of metastasis is tumourectomy associated with frozen section examination, while mastectomy and lymph node dissection are unnecessary. The prognosis is often poor with a life expectancy rarely exceeding one year. The authors report a case of isolated right breast metastasis occurring two and a half years after left radical nephrectomy for renal cell carcinoma. Tumourectomy and frozen section examination were performed. The patient died four years later in a context of disseminated metastases despite immunotherapy.