This comes more than three years after new guidelines rejected the idea of routine annual mammograms for most women.
In fact, mammogram rates actually increased overall by a few percentage points from 2008 to 2011.
Experts say there have been no significant changes in the rate of screening mammograms among any age group but in particular among women under the age of 50.
In 2009, the U.S. Preventive Services Task Force issued new guidelines that said women younger than 50 don't need routine annual mammograms and those 50 to 74 could get screened every two years.
