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Benign and malignant breast masses on MRI. (A) Benign-looking breast mass of 17×12mm (arrow), oval, circumscribed margin and homogeneous enhancement in a 40-year-old woman. Pathological diagnosis: fibroadenoma. (B) Malignant-looking breast mass of 36×32mm (arrow), irregular, non-circumscribed margin and heterogeneous enhancement in a 60-year-old woman. Pathological diagnosis: invasive ductal carcinoma.
