Figure 5b. Images obtained in a 50-year-old woman with a subareolar mass 4 cm in longest diameter. The right breast was normal. (a) Craniocaudal mammogram of the left breast shows skin thickening that was seen with bright light (not seen on the image) and a mass (*). The anterior contour of the mass (arrows) is obscured by the fibroglandular tissue opacities; the posterior contour shows irregularity. (b) Transverse US scans show two solid masses (arrows) with irregular contours in the subareolar region, which is consistent with multifocal carcinoma. Histologic subtypes and sizes: invasive ductal carcinoma and multifocal carcinoma, 4.5 and 0.7 cm in longest diameter, respectively.