Breast hamartomas are typically a benign condition and rarely develop into malignantlesions. The coexistence of carcinoma and a breast hamartoma is rare; only 15cases have been reported in the literature. Here, we report a case of invasive ductalcarcinoma associated with hamartoma in a 60-year-old woman. Mammography,ultrasonography and magnetic resonance imaging showed typical features of abreast hamartoma and a suspicious mass with microcalcifications arising within thehamartoma.