MRI (Magnetic Resonance Imaging) can be used to get a clear, high contrast image of tissue. If a mammogram has shown a breast mass that seems worrisome, an ultrasound or an MRI can help get more accurate information about it. If the MRI confirms that a mass looks cancerous, a biopsy is the next step. Breast MRIs are much more expensive than mammograms, and the equipment is not as widely available. MRI technology is not used for routine breast screening, but for additional diagnostic imaging of abnormal tissue.
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Mitchell D. Schnall, M.D., Ph.D. University Of Pennsylvania. Diagnosis: Mammogram vs. MRI: Breast (cancer) National Cancer Institute. February 1994.