Hi, I think it probably varies depending on where you are, did they not give you any indication at your appointment? I would think 1-2 weeks. Try to stay positive, it's the waiting part that's the worst x
Could mean several things. Maybe the scan they have is not clear enough, if you accidentally move the scans become grainy. It could be that they have found a suspect lymph node and need more info on that.
I had an MRI first, then a PET scan to rule out any spread to remote organs or lymphe nodes. It's not uncommon.
My MRI showed three suspect lymphe nodes, but the PET scan was clear, no lymph node involved according to the PET scan.