SER maps of tumors in recurrence group identified from SER images acquired before neoadjuvant chemotherapy (three-dimensional fast gradient-recalled echo, 8/4.2, 20° flip angle). SER maps were color-coded in red (SER values > 1.45, high SER), yellow (SER values more than 0.71 to 1.45), and blue (SER values 0.47–0.71, low SER). Top row: Tumors with a number of blue voxels above a cutoff level of 10 000 voxels (ie, 11.0 cm3). (Note that low SER voxels follow an infiltrative pattern through the parenchyma rather than forming a discrete mass.) Bottom row: Tumors with a number of red voxels (rapidly enhancing tissue) above a cutoff level of 6000 voxels (ie, 6.6 cm3).