[A study on six cases of renal cell carcinoma detected by renal ultrasound during health screening].

From April 1986 to March 1988, 7,800 subjects (3,887 men and 3,913 women, age from 24 to 80 years, with a mean age of 48.7 years) underwent renal ultrasound during a screening by our Health Service. Of these subjects 29 were suspected to have solid masses in the kidneys. Further examination with computerized tomography (CT) was employed. Four angiomyolipomas and 16 malformations of the kidneys were diagnosed clinically at that time. Among 9 subjects who underwent complete urological evaluation including excretory urography (IVP), CT and renal angiography 6 malignant renal tumors were disclosed. Six patients were treated by radical nephrectomy. In this report we studied the 6 patients whose tumors were pathologically diagnosed as renal cell carcinoma (RCC). The six patients were 48 to 60 years old with a mean age of 55.8 years. There were 4 men and 2 women. There are no signs or symptoms referable to RCC. In 1 patients microscopic hematuria was detected via a laboratory study. Erythrocyte sedimentation rate (ESR) was slightly evaluated in 4 patients. In the 6 patients, the renal tumors were diagnosable by CT and all tumors had positive findings for malignant neoplasms angiographically. An IVP, without nephrotomography, did not reveal a small tumor growing in the upper pole of the right kidney of 1 patient. Surgical specimens were 180-475 g in weight. Tumors, were found in the right kidneys (2) and in the left kidneys (4), were well circumscribed. The size of the tumors measured from 3 to 7 cm in the longest axis. Pathological diagnosis was made as renal cell carcinoma 3 with G1, pT2a, 2 with G2, pT2a and 1 with G2, pT2b.(ABSTRACT TRUNCATED AT 250 WORDS)