What is it called in the medical vocabulary?

There are a number of structures that form in breast tissue that are sometimes mistaken for tumors on mammograms. Calcifications are small deposits of calcium rich material (a href="http://breastcancer.about.com/od/mammograms/p/calcifications.htm)." rel="nofollow"http://breastcancer.about.com/od/mammogr…/a Fibroglandular tissue is normal breast tissue that has the same density as a tumor and also results in false positives in a mammogram (a href="http://www.cancer.gov/cancertopics/factsheet/Detection/mammograms#a4)." rel="nofollow"http://www.cancer.gov/cancertopics/facts…/a