Screening mammograms in women under age 40 result in high rates of callbacks and additional imaging tests but low rates of cancer detection, according to a study published online May 3 in the Journal of the National Cancer Institute. Many studies have assessed mammography in women over age 40 years, but little is known about its usefulness in younger women. Although screening mammograms are not generally recommended under age 40, about 29% of women between 30 and 40 report having had one. To determine the accuracy and outcomes of mammograms in younger women, Bonnie C. Yankaskas, Ph..D... 
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