after a mammogram 2 years ago, one implant has felt odd. I felt it immediately. What could have happened? still odd feeling.

Hello!  Thank you for your question!  It is very rare for a mammogram to have caused the actual rupture of your implant or caused enough trauma to change the pocket.  It is always wise to discuss with the technician that you do have implants, so that proper maneuvers will be taken to displace your implants for imaging of the breast.  That being said, although very rare, some things may have changed since your last mammogram and it is warranted to see your plastic surgeon for evaluation and examination.  Certainly rupture, capsular contracture, or other breast findings are possible and should be evaluated.  Good luck!

It is impossible to say that a mammogram has not altered the capsule around a breast implant with a breast implant itself. It is very very unlikely however. You should visit your surgeon.

Photos might help some.  It seems that your mammogram looked ok and your surgeon found nothing abnormal, so it would be hard to diagnose a problem over the internet without the benefit of an exam.It is possible that a mammogram could release a capsular contracture and make a firm implant feel softer. and a rupture of an implant is possible.  If saline, it would be obvious as the implant would deflate completely in almost all such cases.  If silicone, there might be a contour change. If this remains a problem, a second opinion from a plastic surgeon is in order. Thanks for your question, all the best.