@JackWhack – I had a stone lodged in one of my calyces, and it was a big one. It was too large for me to pass, and the doctor said I needed surgery instead of just a catheter.
He had to make a cut in my back to put a scope in there. He broke up the stone and took it out with the scope.
I had to be in the hospital for several days. It was a rough thing to go through, but in a way, I'm glad I didn't have to pass that stone on my own. It would have been incredibly painful and probably impossible because of its size.