It is possible for an implant, like a tire, to have a slow leak rather than a total deflation. This may be what you are experiencing so I would recommend that you visit your plastic surgeon for evaluation.
Saline Breast Implants - Ruptured, Leaking, Mechanical Problems
With saline implants it will typically become very clear very quickly. If there is any sort of a mechanical problem - such as an out-and-out rupture, a deflation, a leak (whether a defective valve or from any other cause) the implant will almost always continue to get smaller and eventually be completely deflated. This process can take a few weeks but more typically takes just a few days. For a couple of days you're not quite sure what's going on, and then it becomes very clear. I have had some patients who developed problems with their saline implants as a result (most likely) of mammograms but in most cases you never really fine out why it happened.
So, although it's not terribly comforting, just wait a bit. Stay in touch with your PS and it will become pretty clear pretty quickly. If the implants are not having a mechanical problem, then it's just a question of the swelling going down differently, and at a different pace (from one side to the other).
I hope that this helps, and good luck,
Maybe your breast implants ruptured
Sudden changes with decreases in breast implant size make me think of rupture, especially if they are saline implants. Follow this along with your surgeon and I'll keep my fingers crossed for you that things are fine.
Breast implant deflation or rupture
What you describe sounds a lot like the implant either deflated or ruptured. I can't think of any other reason why or how one side can suddenly become a lot smaller than the other. Make sure your surgeon carefully examines you. If there is still some doubt, you may want to get an ultrasound of the breasts to confirm or rule out a deflation/rupture.
Only your surgeon can tell you for sure
The only way to know with any certainty whether you have a leaking or ruptured implant is to pay a visit to your surgeon's office and have him/her examine you.
With saline implants, as long as you are beyond the period of postoperative swelling, any short term change in the volume of one breast compared to the other should suggest leaking and a visit to your surgeon.
I hope we're wrong, but you should stop in to be sure...
Possibly an implant deflation
In the absence of any trauma or reason for one breast to swell or be larger, a smaller breast implies that you may have an implant deflation. Often times there isn't a preceeding event and it "just happens". Get in to see your plastic surgeon and they can give you a better idea. I hope this helps