Fig. 1

Study flowchart. The study flowchart includes 4 main steps: the first step was the acquisition of CT images and the drawing of the ROI of the primary lesion. The second step was the feature extraction from images of plain CT scan and contrast-enhanced CT scan. The third step was data analysis, including multivariate logistic regression analysis of traditional diagnostic factors and dimensionality reduction analysis of radiomics features; the fourth step was model construction and analysis of diagnostic efficacy