Abstract: This study explored the value of enhanced CT scan parameters in differentiating benign and malignant renal tumors. 66 patients with renal tumors were selected, all patients were given enhanced CT scanning, 30 were malignant and 36 were benign. The CT value of lesions, the relative renal cortex corrected CT value and the relative renal cortex corrected CT value in the excretion phase in the malignant group were significantly lower than those in the benign group (P<0.05), and the gray value ratio in the malignant group was significantly higher than that in the benign group (P<0.05). The area under the ROC curve of CT value, gray value ratio, relative renal cortex corrected CT value and relative renal cortex corrected CT value in the diagnosis of renal malignant tumor were 0.732, 0.731, 0.772 and 0.843, respectively, P<0.05. Logistic regression was established for lesion CT value, grayscale value ratio, relative cortical corrected CT value in plain scan period and relative cortical corrected CT value in excretory period, the area under the ROC curve of this model for the diagnosis of renal malignant tumor was 0.940, P<0.05. The parameters of enhanced CT have a good application value in the differential diagnosis of benign and malignant renal tumors.

Key words: enhanced CT, kidney, tumor, benign and malignant