I have a sharp intermittent pain in my left calf, it has been going on for two years in the exact same spot, I had an Ultrasound and it showed a surface cyst, tiny, not causing me pain or problems. I had an MRI and it showed I have edema deep in my calf,,,, apparently indicative of a strain. I did not injure the leg and if it is a strain why has it not healed in two years and why does the pain come and go?