A new study shows that up to 25 percent of women who have harmless breast tumors undergo invasive cancer treatments anyway, because mammograms don't differentiate between agressive cancers and those that would never cause symptoms.
This is a NASA image. It's not a galaxy or a Saturnian moon. It's a breast mammogram made with the same tools used to enhance the images taken by their Earth observation satellites. And it helps doctors detecting cancer earlier.