Right. I know 3 people who are professional kidney stone creators. Two–unrelated–do what they’re told to do. They stil have to get them broken up to pass every 5-10 years.
SIL is Special in many ways refusal of self-care like showering or living on only milk and Diet Coke (both of which and together create more kidney stones, which she has been advised for 3 decades).
She’ll piss blood for 2 years before going in for the sonic screwdriver (breaking stones so they’ll pass).
This time, it wasn’t enough. She had surgery to remove stones from inside her kidneys.
They went inside, broke them up and retrieved these. There are more growing on the outside, which will require later work.