BIOPSY ASAP,THIS AND NOTHING ELSE TO START,ITS THE ONLY WAY TO KNOW WHAT YOUR DEALING WITH.I HOPE IT DOESNT TURN OUT YOU HAVE OSTEOSARCOMA,GOODLUCK!@KEEP US POSTED,THERE ARE 40 POSSIBLE CAUSES.NOT ALL OF THEM ARE BAD.BUT THE REALITY IS IT APPEARS SOMETHING THEN is eating away at your bones,causing a fracture. not a stress fracture, a pathologic fracture (look that term up)the reality is that cancer is a possibility at this poi