Fig. 4.

a A radiomics nomogram incorporating the radiomics signature, Knosp grade, periarterial enhancement, and inferolateral venous compartment obliteration on the training set. b Calibration curve of the radiomics nomogram on the training set. c Calibration curve of the radiomics nomogram on the test set. Calibration curve presents the agreement between the predicted invasion probability and observed outcomes of invasion. The diagonal blue line represents an ideal evaluation, while the black and red lines represent the performance of the nomogram. Closer fit to the diagonal blue line indicates a better evaluation