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[A Case of Bladder Metastasis from Breast Cancer].

A 64-year-old woman visited hospital with a chief complaint of a nodule at the left neck skin. Skin biopsy revealed adenocarcinoma, and the diagnosis was skin metastasis of unknown primary origin. Positron emission tomography and computed tomography showed multiple bone and lymph node metastasis, left breast tumor, bladder tumor, and hydronephrosis. A needle biopsy of breast revealed invasive ductal carcinoma, and transurethral biopsy of bladder revealed adenocarcinoma. The findings were similar to those for the breast and the expression pattern of estrogen-receptor was the same. We diagnosed her with breast cancer and bladder metastasis. We administered systemic chemotherapy, however she died 10 days later. Bladder metastasis of breast cancer is rarely encountered in clinical practice and is often accompanied by life threatening symptoms. Careful histopathological examinations and rapid systemic chemotherapy are significant.