Abstract:

Objective: To review the pathologic findings of a contemporary series of surgically treated renal tumors suspicious for malignancy to assess the frequency of benign disease and treatment modality.Materials and Methods: The records of 188 patients 120 male, 68 female underwent surgery for suspicious renal mass for malignancy between February 2005 and December 2010 were reviewed retrospectively.Results: Of 188 cases, records of a total of 178 cases were available for analysis. 142 patients underwent radical nephrectomy 79% , 28 nephron sparing surgery 15% , 4 renal biopsy 3% and 4 nephroureterectomy 3% . Of 178 tumors, 66 37% were discovered incidentally. Forty three 66% of incidentally diagnosed renal masses size were less than 7 cm. The pathologic evaluation demonstrated malignancy in 156 88% and benign disease in 22 12% .Benign masses were oncocytoma n=11 , angiomyolipoma n=6 , cystic nephroma n=2 , xanthogranulomatous pyelonephritis n=2 and metanephric adenoma n=1 . Of 91 renal masses with size of less than 7 cm, 22 24% had benign pathology and none of benign masses were bigger than 7 cm.Conclusion: Inspite of great technological development in the radiological imaging modalities, benign lesions may still be detected pathologically in the patients with preoperative diagnosis of renal cancer. Nephron sparing surgery should be kept in mind for the renal masses less than 7 cm, if possible

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