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[Incidental renal cell carcinoma: analysis of 109 cases]
Guosheng Yang1, Zhaodian Chen, Yifeng Peng
1Department of Urology, First Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310003, China.
Objective:
To study the characteristics, diagnosis,treatment and prognosis of incidental renal cell carcinoma(RCC).
Methods:
109 cases of incidental RCC treated in 20 years were analyzed retrospectively and compared with 247 cases of non-incidental RCC.
Results:
The age, sex and side between incidental RCC and non-incidental RCC were not significant (P > 0.05). Compared to the non-incidental RCC,the diameter of incidental RCC [(4.1 +/- 1.7) cm] was smaller and its stage was lower (P < 0.01). Ultrasonography and CT can improve the detection rate of incidental RCC significantly, and operation is more effective for incidental RCC than for non-incidental RCC (P < 0.01). The 3 and 5 year cancer specific survival rates in patients with incidental RCC were higher than those of non-incidental RCC(P < 0.01). The detection rate of incidental RCC was higher from 1990 to 1999 (39.3%) than from 1980 to 1989 (15.6%) (P < 0.01).
Conclusions:
Incidental RCC is not another type of RCC, but a developing stage of RCC without appearance of a symptoms. Ultrasonography and CT are important to diagnose incidental RCC. Low pathological stage, small size, early diagnosis, and radical nephrectomy indicate better prognosis of incidental RCC.