What good news! If his problems involve crystals in his urine, then I suspect a dietary change will be recommended. We've had two of our cats over the years with urinary/kidney issues, and both times a special kidney diet food was recommended, and did help. My parents also have a neutered male kitty who has had urinary/kidney problems, and after they put him on the special diet, he hasn't had a problem.

Hopefully, with monitoring and preventative care, this won't happen again.