Statistical analysis
high-grade malignancy, malignancy, SD
P-P plots and Q-Q plots were used to assess normal distribution of data. Continuous distributed data were showed as mean ± SD, and categorical variables were expressed as n (%). Univariate analysis using t test or Mann-Whitney U test for continuous variables and Fisher’s exact test for categorical variables were performed to compare CT features between the low-grade malignancy and high-grade malignancy groups. Variables with 