I had surgery for another problem. That night, the back of my knee looked as though there was a softball behind it. I immediately called my doctor, who wasn't at all concerned. The next day, I had an appointment with my oncologist, who did an ultrasound to rule out a blood clot. It was a Baker's cyst. Another doctor tried to drain it. However, later that evening, it felt like someone turned on a faucet behind my knee and now it is even bigger. My doctor says they do not cause pain, but he definitely has never had one. Some days it's hard to stand up. Now, I don't know where to turn.

I developed a very large bruise and lump on the back of my left knee after taking two flights over five hours. The area felt tight, hot, was painful at touch, and had a significant lump. I was concerned it might be a blood clot and went to a local hospital. An ultrasound revealed nothing. Upon returning home, I saw my doctor, who diagnosed a Baker's cyst rupture. An MRI confirmed the cyst along with minor bursitis.