The patient was a 74-year-old man. Computed tomography (CT) detected a right renal tumor with paraaortic lymph node swelling. Radical nephrectomy and left lymphadenectomy were performed in September 2008. Interferon-alpha (6 million international units three times per week) was administered as adjuvant therapy. Due to the development of side effects, including fatigue, the patient's immunotherapy was discontinued after 6 months. Radiofrequency ablation for pulmonary metastasis was performed 9 months after surgery. A nodular pedunculated tumor was detected on the posterior wall of the urinary bladder by CT, and transurethral resection was performed 18 months after nephrectomy/lymphadenectomy. Since the pathological diagnosis of the bladder tumor was clear cell carcinoma, that tumor was thought to have originated from the renal cell carcinoma. We have summarized 43 cases of bladder metastasis of renal cell carcinoma in Japanese patients, including ours.
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