Hi @colthul,
I hear you about the scan costs. I live in Brisbane and my out of pocket costs for scans and everything else is enormous. However your dr has a concern so it must be checked for peace of mind. I hope it turns out to be nothing but if it is something then the earlier it is found the better. Re tumors and how they grow, well that's anyone's guess. I had a fracture in my spine in January of this year. My oncologist did scans at the time and then every 2 months because of suspicion of bone mets. The cancer didn't show up in the first few cans but finally presented it's ugly self in July. So in my case it took 5 to 6 months before it appeared on a scan. I am currently being treated for it. It is good it was found so early so now the progression can be halted. Best wishes for your scan.
