CHICAGO (Reuters) – Women with newly diagnosedbreast cancer who get an MRI scan wait about three weeks longerbefore their surgery and are far more likely to get a mastectomythan women who have only a mammogram, U.S. researchers said onSaturday.

“MRI may not be as good as we think it is,” said Dr. RichardBleicher of the Fox Chase Cancer Center in Philadelphia, whopresented his findings at the American Society of ClinicalOncology’s Breast Cancer Symposium in Washington.

“Those who received an MRI had a three-week delay in the startof their treatment,” Bleicher said in a statement.

“In addition to the treatment delay, we’re concerned that thewell-documented false-positive rate with MRIs may be leading – ormisleading – women into choosing mastectomies.”

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