Millions of women in 21 states will get an ominous note with their mammogram results this year. Even if everything seems fine, they’ll be informed that they have dense breast tissue, which can raise their risk for cancer and hide abnormalities, making their mammograms less accurate.
A host of new breast-imaging technologies promise to detect more cancers in these women. But many of the methods bring more false alarms as well, subjecting women to additional tests and biopsies unnecessarily. Some are also more expensive than mammograms and haven’t been widely studied yet.