Abstract: Objective To study the correlation of multislice spiral CT features and vascular endothelial growth factor(VEGF)expressions and microvessel density(MVD)in renal cell carcinoma(RCC).Methods Fourth-seven patients with pathologically confirmed RCC were examined by multislice spiral CT,and VEGF expressions and MVD of the RCC and the adjacent normal tissues were determined by immunohistochemistry with specific monoclonal antibodies.Results VEGF expression and MVD in the RCC and adjacent normal tissues increased with the pathological grades of RCC(P<0.05),VEGF expression was found to significantly correlate with MVD(r=0.67,P<0.01).The positive expression of VEGF and MVD were associated with the findings by multislice spiral CT scan of tumor size,intratumor necrosis,cystic degeneration,intensity signal,lymph node metastases,invasion of the renal vein or inferior vena cava,and invasion of the adjacent organs or distant metastases(P<0.01).Conclusion Multislice spiral CT findings can be indicative of the histopathology of RCC,and some CT findings are closely correlated with MVD and VEGF expressions in RCC,which may help evaluate the biological behavior and malignancy of the tumor and predict tumor invasion and metastasis.