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Fig. 2B —MRI–sonography coregistration images in 50-year-old asymptomatic woman at high risk who presented with BI-RADS category 5 mass in left breast detected on MRI screening examination, corresponding to invasive ductal carcinoma. Coregistered coronal sonogram shows irregular mass (arrow) that is isoechoic to fat, with similar size and location from the MRI calculated position. Echogenic fibroglandular tissue interfaces with more hyperechoic fat surrounding mass are indicated by arrowheads and are similar to those visible on coronal MR image in C. Measured three-plane error from sonogram in this case was x error = 1.6 mm, y error = 1.8 mm, and z error = -1.4 mm.