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For women at high risk for breast cancer, typically because of a strong family history, MRI may be an appropriate tool to screen for breast cancer in conjunction with mammography and ultrasound. A strong family history is usually a mother or sister who has had breast cancer before age 50. It can also be aunts or cousins, including those on your father’s side. Relatives who have had ovarian cancer also increase your risk. Your radiologist or primary care doctor can look at your family history and determine if screening MRI may be appropriate for you. Depending on your family history, genetic counseling may also be recommended.
After being diagnosed with breast cancer, a breast MRI may be performed to determine:
- how large the cancer is and whether it involves the underlying muscle.
- if there are other cancers in the same breast and whether there is an unsuspected cancer in the opposite breast.
- if there are any abnormally large lymph nodes in the armpit, which can be a sign the cancer has spread to that site.
Sometimes an abnormality seen on a mammogram cannot be adequately evaluated by additional mammography and ultrasound alone. In these rare cases, MRI can be used to definitively determine if the abnormality needs biopsy or can safely be left alone.
Scarring and recurrent cancer can look identical on mammography and ultrasound. If a change in a lumpectomy scar is detected by either mammography or a physical exam, MRI can help determine whether the change is normal maturation of the scar or a recurrence of the cancer.
In some cases, breast cancer will be treated with chemotherapy before it has been removed by surgery. This is called neoadjuvant chemotherapy. In these cases, MRI is often used to monitor how well the chemotherapy is working and to reevaluate the amount of tumor still present before the surgery is
MRI is the best test for determining whether silicone implants have ruptured.