MRI is more sensitive than mammography or breast ultrasound, as has been noted by many authors.1 The American Cancer Society guidelines for breast MRI recognize that despite false-positives MRI is beneficial for those at greater than 20% to 25% lifetime risk of breast cancer.2 Multiple studies have shown that MRI has a sensitivity of 70% to 100%, which is considerably higher than that of mammography or ultrasound. Obtaining negative surgical margins has been shown to improve outcome after breast conservation. 4 MRI can show the true extent of disease and decrease the rate of second and third surgeries performed in the quest for negative margins.
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