本文报告经“Ｂ超”偶然发现或健康体检时“Ｂ”超发现无症状肾细胞癌２１例，占我院１９８５年以来收治１１９例肾细胞癌的１８％，本文就其肿瘤大小及临床分期情况、无症状肾癌与同期收治的有症状肾癌进行比较，提示无症状肾癌临床分期早，但临床症状的出现并不与肿瘤大小呈正相关，无症状肾癌预后优于有症状肾癌。本文着重就其临床特点与临床分期进行讨论。 This article reports 21 cases of “B” super-discovery of asymptomatic renal cell carcinoma by “B-super” accidental discovery or physical examination, accounting for 18% of 119 cases of renal cell carcinoma admitted to our hospital since 1985. In this paper, the tumor size and clinical stage Asymptomatic renal cell carcinoma was compared with symptomatic renal cell carcinoma treated in the same period, suggesting that the clinical stage of asymptomatic renal cell carcinoma was earlier, but the appearance of clinical symptoms was not positively correlated with tumor size. The prognosis of asymptomatic renal cell carcinoma was superior to that of symptomatic renal cell carcinoma . This article focuses on its clinical features and clinical stage to be discussed.