(A) Graph shows the results of the ROC-based positive test between pleomorphic adenoma and malignant tumors at variable ADC levels. The cutoff level of ADC values between pleomorphic adenoma and malignant tumor was 1.29 × 10−3 mm2 s–1. (sensitivity, 100%; specificity, 91.67%; AUC = 0.9907). (B) Graph shows the results of the ROC-based positive test between adenolymphoma and malignant tumor at variable ADC levels. The cutoff level of ADC values between lymphoma and malignant tumor was 0.78 × 10–3 mm2 s–1. (sensitivity, 91.67%; specificity, 84.62%; AUC = 0.9263). ADC, apparent diffusion coefficient; AUC, area under the curve; ROC, receiver operating characteristic.