Get a second opinion asap and also consult a nephrologist and oncologist. It’s a lot of work but will be worth it. They may agree with the urologist but then at least you’ll know you made the right decision. I was diagnosed with UTUC in 5/22 and my first urologist was ready to schedule a nephrectomy that day. I got a second opinion and this doctor said NO to the nephrectomy and ablated my tumors. So far nothing has come back. I have a cystoscopy every 3 months to check my bladder but I still have my kidney.