Hi! I had breast implants done about 23 years ago. They are silicone. I have never had a problem with them. I had a mri during the silicone hey day and everything was fine. I had a mamograpphy 4 years ago and again fine. I was wondering if its possible that one of them has moved ? I feel it protruding into the space between both breasts. Can they shift? Or move? Could it be something more serious? Thanks Laura T.