A breast MRI (magnetic resonance imaging) exam is a non-invasive diagnostic examination that uses magnetic fields to capture multiple images of the breast tissue to create detailed, computer-generated pictures of your breasts. A breast MRI sometimes is used to diagnose and evaluate breast tumors. Under some circumstances, this test may better identify a small mass within a woman’s breast than a mammogram or ultrasound, particularly for women with very dense (non-fatty) breast tissue and can be very beneficial to detect early cancer in high risk patients. Breast MRI’s are also used as an assessment tool to evaluate the extent of breast cancer. Breast MRI is also very useful in the evaluation of breast implants.