The groups were evaluated and compared for patient characteristics, short-axis diameter, volume, short-axis/long-axis ratio, and lymph node sphericity. Data were expressed as means ± standard deviations (SDs), and values for categorical variables were given as percentages. The χ2 test was used to compare categorical variables, and the Mann-Whitney U test, for nonparametric data. Receiver operating characteristic (ROC) curves for each parameter were constructed, and the area under the curve (AUC) was calculated with the histopathologic diagnosis as the outcome. All statistical analysis were performed using SPSS version 18.0 (IBM Corporation, Armonk, NY, USA). Probability values less than 0.05 were considered significant.
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