A government task force is changing the guidelines for breast cancer screening, and the major medical reversal could affect millions of American women.
For years women over 40-years-old were told to get a mammogram every year because early detection saves lives. Now experts are saying they're not effective and lead to unnecessary biopsies.
Women are being told to wait until they're 50-years-old to start getting screened, leaving many scratching their heads. CNN's Kiran Chetry reports.
Read more: Task force changes mammography guidelines