[A case of the coexistence of renal cysts and renal cell carcinoma associated with direct invasion of the liver (stage IV)].

A 63-year-old male was admitted with a complaint of right abdominal mass. A right renal tumor associated with direct invasion to liver and with lobulated cystic lesion and renal solitary cyst were diagnosed preoperatively by aortography and computed tomography. Transperitoneal radical nephrectomy and partial resection of liver metastasis were performed. Histological diagnosis was clear cell carcinoma with dilated tubuli. Tumor invasion to the inferolateral portion of the liver and to the renal solitary cyst wall were demonstrated by both gross and microscopic examinations. The coexistence of tumor and cyst in the same kidney is rare. Our case probably had both the type I and II or III tumors according to Gibson classification. Twenty months after radical nephrectomy, pulmonary metastases were detected by chest x-ray, tomography and bronchial arteriography. All metastatic lesions were replaced by fibrous change 7 months after the four bronchial arterial infusions (BAI) of ADM 30 mg and irradiation with a dose of 5,000 rads to each lesion. After 9 tumor-free months, recurrence of pulmonary metastases were pointed out by chest x-ray and tomography. They (four coin lesions) were treated with anticancer therapy, mainly irradiation and twice insufficient BAI. Three of them were occupied entirely by fibrous change and another solid one remained in the right pulmonary apex without enlargement for the past 4 months. Radical nephrectomy and partial resection of the liver for the primary renal cell carcinoma with direct invasion to liver, BAI and irradiation for the two pulmonary metastases have kept the patient alive for 4 years.