The risk of dying from breast cancer does not appear to be greater in women with dense breasts who get breast cancer. That may be because women with breast cancer often are treated with medicines that lower estrogen levels and block the effects of estrogen. Women with dense breasts are advised to get a breast MRI in addition to a mammogram if they have a known hereditary cancer gene, a first-degree relative with the mutation, a history of radiation to the chest wall in adolescence, or a 20% to 25% or greater lifetime risk of breast cancer based on family history and other risks.
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