Mammograms may increase risk for ‘over-diagnosis’ of cancers: Study
 

According to a new study from Norway up to a fourth of breast cancers found through mammograms are harmless and would not cause noticeable disease during the women's lifetimes. Such women are said to be over-diagnosed, because their cancers would not have caused symptoms or death. Over-diagnosis is a problem because women may receive tests and treatment they did not actually need.

More...