Hi,
For me, they always do a sonogram along with the mammogram and I've been getting them for over 10 years. Well, they found not 1, not 2, but 6 things, which turned out to be fibroaednomas. I had to have an MRI and it all turned out to be OK. I did find out that about 80% of all things found in breast tissue are benign. I could only feel one of mine, but then, the surgeon and I have felt that one for several years. She said that they had probably been there for a long time and that it was just now that they could see them.
Try not to worry, but I know that is nearly impossible. I about went nuts during the 4 weeks all of this was going on for me.
Tracy