RE: "behind the knee pain"

Several years ago I awoke to a very swollen left calf, painful. My foot was swollen as well.
I went to the ER and seeing that it was a weekend, they didn't have an ultrasonographer in house, but they called someone in to do an U/S.
What was first thought to be DVT (Thank you God it wasn't), turned out to be a "Baker's cyst" in the back of my left knee.

I was lucky -- it wasn't DVT.

I "googled" Baker's Cyst, but as SadieKate stated, I don't want to add a link because I'm not sure that the articles are medically credible.

Denise