MRI

Hi i went for a breast MRI just over a week ago, was diagnosed Lobular and ductal left breast in May 2007, followed by mastectomy and Arimidex, went for the breast MRI private cost £550 kind family member paid, unfortunately I have been called back for an ultrasound. I know from the mammo of my right breast last year i have benign calcification but i did have that prior to my diagnosis and it turned into breast cancer. Would this show up on a mammo, i have heard that calcification does not show up on a MRI. Sorry if i am ranting a bit but am totally terrified either of a recurrance or something picked up on the mastectomy site.Would be grateful for any feedback on any of this.

Thanks
Suzy