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Abstract Objective：To analyze the problems in diagnosing renal oncocytoma by spiral CT and pathology， in order to improve the accuracy of diagnosis.Method：The imaging features of CT of 12 lesions confirmed by pathology were analysed retrospectively and correlated by pathologic diagnosis.Result：11 cases were single nodule， accompanying with the diameter of lesion was 20-87.0 mm， average 53.5 mm.ON plain CT scan，1 lesion showed a little higher density than the renal parenchyma，central stellate scar showed low density shadow.In the cortical phase， 5 cases displayed inhomogeneous enhancement，and 6 cases displayed homogeneous enhancement in part.The enhanced degree of all lesions were higher than that of medulla， and lower than that of cortex.In parenchymal phase， the enhanced degree of all lesions were lower than that of medulla.In excretory phase， the density of solid part of tumor was equation， and below that of the renal parenchyma， which was corresponding with the pathological feature：the tumor was less of hemorrhage，necrosis and cystic degeneration.The case of bilateral multiple renal lesions also followed the strengthening method.6 cases showed central slit shaped or stellate shaped scar，and all cases showed no calcification.Conclusion：Since renal oncocytoma is a kind of benign renal tumor， which has some imaging features in enhanced spiral CT scan， taking renal biopsy before operation or surgery frozen biopsy will be useful to make therapy plan for the benefits of patients.
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