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Fig. 1A. —Graph shows receiver operating characteristic curves for each radiologist with and without contrast-enhanced sonography. Graphs show performance of radiologists 1 (A) and 2 (B). Radiologists achieved higher area under the receiver operating characteristic curve (A_z) values when contrast-enhanced sonography was added for interpretation than when only baseline sonography was reviewed. Difference in A_z values between with and without contrast-enhanced sonography was statistically significant (p < 0.05). Solid line (A_z, 0.753 [A], 0.830 [B]) = without contrast-enhanced sonography, dotted line (A_z, 0.971 [A], 0.974 [B]) = with contrast-enhanced sonography.