ln this photo taken Wednesday Sept. 14, 2011, Dr. Karen Lindsfor, a professor of radiology and chief of breast imaging at the University of California, Davis Medical Center, examines the mammogram of a patient with heterogeneously dense breast tissue, in Sacramento, Calif.

A study conducted at University of North Carolina at Chapel Hill found that false positive mammograms are linked to a slightly increased risk of breast cancer. To assess cancer risk after false positives, researchers reviewed data on over 2.2 million mammograms performed in almost 1.3 million women aged 40 to 75 between 1994 and 2009. They discovered that women who have abnormal mammogram results may be at increased risk for developing breast cancer even when follow-up tests fail to detect tumors.

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