Have behind the knee pain intensifying over the last 8 months. Have had ultra-sound for baker s cyst, blood clot, emg , aertial ultra sound of the leg, blood tests, x-rayed for arthritis , mri of the lumbar, mri of the calf muscle. Nothing has been identified although the calf mri did show some edema and possibly a non-encapuslated lipoma. Should I pursue further with a specialist in a major city hospital or teaching hospital? Am finding it increasingly painful and more difficult to walk. Pain intensifies at night in bed. Thank you