I often get asked why can’t a woman just get a breast MRI rather than a mammogram. The imaging tests that we do for breast cancer screening and evaluation of abnormalities have different strengths and weaknesses.
Mammograms are very useful as a screening tool. They can be done quickly and read efficiently by the breast radiologist. They have minimal radiation exposure. They can be done by a mobile coach in locations that are more convenient to patients. They are excellent for identifying abnormal calcium deposits within the breast tissue and for seeing disrupted tissue and masses. They may be less effective in women who have dense breast tissue but the digital techniques have helped some with that.
Ultrasound is a great tool for evaluating a mass or tissue asymmetry found on mammograms. It can distinguish between a benign appearing solid mass, a fluid filled cyst, a mass that is suspicious for cancer, or normal appearing breast tissue. There is no radiation exposure. It is less reliable as a screening tool because it can be dependent on the skill of the physician or technologist doing the procedure. It is possible to miss abnormalities or to mis-interpret normal findings as abnormal. There are studies underway evaluating using an automated version of ultrasound as a screening test but the results are not conclusive and this is not considered ready for standard practice.
Breast MRI is a highly sensitive test that is very dependent on...