Objective:To assess the correlation between renal volume measured on contrast-enhanced CT images normalized by BSA (body surface area) and renal function in patients with renal tumors. Methods:Thirty-four patients with renal tumors underwent abdominal contrast-enhanced CT and radionuclide renography within one week before surgery. Residual bilateral renal cortical volume (RCV) and renal medullary volume (RMV) on arterial phase images were measured by a semiautomatic software. Renal parenchymal volume (RPV) was the sum of RCV and RMV. Glomerular filtration rate (GFR) measured by radionuclide renography was considered as the reference standard. RPV,RCV,RPV normalized by BSA(RPVBSA=RPV/BSA),and RCV normalized by BSA(RCVBSA=RCV/BSA) were correlated with GFR using the Pearson correlation coefficient,respectively. Results:The correlation between RPV / RCV and GFR presented r = 0.474,P = 0.005 and r = 0.448,P = 0.008,respectively. RPVBSA and RCVBSA had a higher degree of correlation (r = 0.659,P < 0.001 and r = 0.627,P < 0.001) with GFR. Conclusion:RPV and RCV measured on arterial phase images could estimate renal function,while RPVBSA and RCVBSA in patients with renal tumors had a better correlation with renal function before surgery.