I've had several mammograms both before age 50 and after, so they had plenty to compare with. I had a breast lump years ago which proved to be benign, plus my sister died of metastatic breast cancer, so I was a bit twitchy, but all is fine. My friend has been recalled 3 times since age 50, for an area of dense tissue. This did put things into perspective. I'm grateful that they are so careful.