From 2000 to 2009, MRI use prior to breast cancer surgery surged from 1% to 25%, based on an analysis of 72,000 patients 67 to 94. Those who got an MRI were more likely to undergo a more aggressive form of surgery, according to findings published in the journal Breast Cancer Research and Treatment. Of the women who underwent mastectomy after having an MRI, 12.5% had both breasts removed, and about 4% of those who didn't receive an MRI had both breasts removed. "There has been no randomized controlled clinical trial demonstrating improved outcomes for women who undergo preoperative breast MRI at any age," lead author Dr. Brigid Killelea said.

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