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Fig. 3C —MRI–sonography coregistration images in 65-year-old woman who presented initially with mass on mammography, confirmed as cyst on sonography. Coronal T1-weighted 2D fast spoiled gradient-recalled echo MR image (150/4.2) of same cyst (arrow) as in A and B. Coordinates of center of cyst (asterisk) were obtained to calculate expected lesion position on sonography. In addition to lesion identification on both MRI and sonography, breast parenchymal interfaces on coronal sonograms and MR images (B) were identified to ensure lesion correlation. Amount of fat between lesion and skin surface was measured as 11 mm in this case, as shown, to calculate expected error introduced in z-plane by differential speed of sound through fat compared with fibroglandular tissue.