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(a) The left medio-lateral oblique view mammogram of a 38-year-old woman who is a breast cancer susceptibility gene mutation carrier showing heterogeneously dense tissue but no discernible signs of cancer. (b) Magnetic resonance imaging in the same patient shows a 4 cm area of non-mass enhancement in the posterior left breast (arrow). Histology: High-Grade Ductal Carcinoma in Situ (DCIS).
