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Fig. 6. —Areas under receiver operating characteristic curves (A_z) compare performance of four diagnostic criteria: radiologists' interpretations of masses as malignant (; A_z = 0.96 ± 0.02), regression model based on MR imaging features (;A_z = 0.86 ± 0.03), percentage of enhancement seen within 60 sec of rapid bolus injection of IV gadolinium (; A_z = 0.74 ± 0.1), and volume of lesions (—; A_z = 0.68 ± 0.04). Radiologists' interpretations had largest area under curve and thus was best discriminator between benign and malignant adnexal masses.