I don't know about the tests as I thought a bone scan was the one for this. I understood that PET and MRI type scans were for soft tissue but really don't know. What I wondered was if you could have some sort of arthritis in your back. When I had a bone scan one time the oncologist showed me white in my lower back and said that I had the beginning of osteoarthritis. I had no idea but used to get severe back aches years ago and had learned to sit upright, etc. to avoid the pain. He said that some people who have arthritic conditions have lots of pain and some very little. Have you asked your doctor whether you could have a pre-existing condition like this?
Best regards,
Cathya
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