I m 19, 5 8 , and 140 pounds. I have a lump above my right knee that feels slightly smaller than a golf ball. It is not visisble, but you can feel that it is there. I visited the doctor and when my doctor couldn t figure out what it was she got another doctor to take a look. He was also unsure as to what it was. They said it was to hard to be many of the things they had suspected. It also did not appear on any xrays. They ordered an MRI with contrast, which should happen in the next couple days. I am a little worried, and wondering what it could possibly be???