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Fig. 1. —Diagram shows relationship between diagnostic performance of MR imaging of breast for residual breast cancer as function of time interval between lumpectomy and MR imaging. Time interval between lumpectomy and MR imaging of breast most strongly influenced specificity and negative predictive value (NPV) of MR imaging. Such influence increased progressively over time. Note plateau of 75% specificity and NPV that was reached at 28 days after surgery. Whereas sensitivity and positive predictive value (PPV) showed smaller variations over time, peak values of 95% and 92% were obtained at 35 and 28 days after surgery, respectively. Sensitivity = {diamondsuit}, specificity = {blacksquare}, PPV = {blacktriangleup}, NPV = X.