lumpectomy cavity filling with fluid 2 year post-op - help!

Hello Ladies. I had a lumpectomy almost 2 years ago, on 7/09 and radiation on 9/09. The large cavity the surgeon left immediately filled with fluid (I heard 'sloshing' sounds when I walked. Weird but not uncommon the doc said.) After about a year, the swelling went down, but not completely away.

Then, like Traci, I recently developed high blood pressure. The PCP 'guaranteed' that if I lost 20 pounds, the blood pressure would take care of itself. So I started exercising and, of course, stretching afterward. The first day it felt good to stretch the muscles under the scar. The second day there was a big lump there.

The ultrasound showed the cavity had changed from a long thin shape (like a Vienna Finger cookie) to a snowball shaped cookie. It is tender to touch and aches once in a while. The radiologist doing the ultrasound said to leave it alone since the cavity had probably built a 'wall' and a needle aspiration would not be a good idea.

Have any of you had experience with the cavity filling with fluid so long after surgery? Can anything be done about it? Will this happen everytime I stretch those muscles?

Thanks. ~~Connie~~