The widespread use of modern diagnostic imaging techniques, especially computed tomography and sonography, has led to the detection of an increasing number of serendipitous renal neoplasms, with no signs nor symptoms related to the neoplastic renal disease. In the last 4 years, 54 consecutive patients (20 females and 34 males) with renal cell carcinoma were reviewed. In 26 patients (48.15 per cent) the diagnosis was made as an incidental finding by an abdominal ultrasound examination. Clear signs and symptoms related to the neoplastic disease were present in 28 cases (51.85 per cent). The pathologic type of each neoplasm was categorized, and each carcinoma was staged. In the patients not surgically treated, the stage was determined on the basis of the diagnostic imaging reports. The results of this study suggest that the incidentally detected tumors are of a significantly lower stage than the symptomatic tumors (Wilcoxon rank sum test: P less than 0.0073 and X2 test: P less than 0.013). Early detection of renal tumors may improve the prognosis and the overall survival of patients with renal cell carcinoma and allow one to plan radical or partial nephrectomy, since local extension has a considerable impact on the operative strategy. Our experience emphasizes the role of ultrasound in the increased early detection of renal cell carcinoma.

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