I was diagnosed with a possible Prolactinoma. I was referred to an Endocrinologist as well as referred for a mammorgram and an US of the breats. I was told that both would show the same information, so my question is what is the major difference that would make me have to have both? Also, what could significant pain under my right armpit lasting for almost a month signify? I am only 30 years old, and my grandmother had a mastectomy about 30-35 years ago for breast cancer, and I have to aunts who both were diagnosed with fibrocystics of the breast.. Could I be suffering the same disease? I am scared, as my family is in California and I am in Texas and have no real support network. Please help to put my mind at ease. Thank you.