A 61-year-old woman, who had undergone total right pneumonectomy 22 months before due to lung cancer (adenosquamous cell carcinoma) was admitted for macroscopic hematuria. Abdominal CT showed two renal tumors in the right kidney. Right radical nephrectomy was performed, because no imaging study showed any other metastasis. Pathological examination revealed adenosquamous cell carcinoma, which was the same pathology as the lung cancer had been. She died of the left lung metastasis 24 months after right radical nephrectomy. Her prognosis was thought to have been prolonged by the operation of right radical nephrectomy.