Dad had a bone scan the other day to help determine the cause of some back pain he is having. X rays turned up nothing and some other tests came up empty. Cross fingers and do whatever is is you do for good luck. Hopefully this is simply a pain in the back. He has a Dr. appt. today and theoretically they will have something to tell him, or at least something to give him to cope with the pain. It’s hard to get him to articulate the extent of this back pain, so there is always that hurdle to deal with also.