I am sure you are scared right now, but the good news (as those above have said), it's really common.
I have never had a mammogram yet or been called back, but my mother got a call back and had to go and have an ultrasound. We have a history of it in our family, so they were being super cautious. It was just a fibrous tissue and she is fine.
We were all really scared. This comes on the heels of my Dad being told he may have prostate cancer. Thankfully, it was a pre-cancerous sort of situation and they caught it early. So, it does happen, but as this problem in stats I just did this week in class shows, about 94% of people screened who have to be re-screened are okay (if this is still accurate I don't know, but I doubt it changes THAT much).
***proud Hoosier, statistics nerd, and mom to a headstrong toddler***
****one car family and loving it!****
Owned by:
Le Monstre Vert - 2013 Surly Cross-check
Chessie, Scottish Terrier
Bonzai, Catahoula Leopard Dog