[Metastatic renal tumor].

Metastases of malignant tumor to the kidney are observed rather frequently at autopsy, but rarely found in living patients. Two cases of metastatic renal tumor were found at our clinic. One was a 35-year-old male with esophageal tumor. Five months after on operation for the esophageal tumor, he had asymptomatic macroscopic hematuria and had urological examinations at our clinic. X-ray and ultrasonographic examinations suggested a metastatic tumor in the left kidney. Left nephrectomy was performed. Pathohistological examination revealed a metastatic esophageal tumor in the kidney. Five months after the nephrectomy, right lumbago and macroscopic hematuria appeared. Metastatic right renal tumor was diagnosed with X-ray and ultrasonographic examination. Chemotherapy was conducted, but he died three months later. The other case was a 69-year-old male with left lung cancer (squamous cell carcinoma) who had left partial pneumonectomy . In the second year after the operation, he developed asymptomatic hematuria. After X-ray examinations and 67G -citrate scanning, a metastasis to the right kidney was diagnosed. No special treatment for the metastasis was given to the patient because of his failing condition. He died four months later. Metastatic renal tumors present a worse prognosis than primary renal cancer. This seems to be because the former progresses rapidly after its discovery. When a patient with a previous history of malignant tumors in any organ develops hematuria or lumbago, detailed examinations of the kidney should be performed.