A year ago I got a call from my urologist's office suggesting that I come in for an xray, which as I noted in post 13, showed no changes (no new stones and no change in the position of the pre-existing stone on the left).
This year no such call, and I have been without symptoms of stones, so I'll let things pass. I suppose that if were imaging to happen, and it showed movement of that left stone, it could be removed before it caused any problem--acute kidney stones aren't just the cause of pain, but can damage the kidney as urine builds up behind the stone.
Still, though, let sleeping dogs or stones or babies lay.