Your father should have been seen by a nephrologist before and after his surgery. I feel saddened by his situation. I was diagnosed with my cancer by a nephrologist after an ultrasound, followed by an MRI. I had my surgery done in October of last year. My cancer was also contained in my kidney. It had never metastized in any other organ. I went back to my urologist (surgeon) after two weeks, then six months later and again just last week to be sure all was okay. I have also been having routine appointments with my nephrologist every two months which includes extensive blood tests.
I just had another MRI this week to check the status of my remaining kidney which is at Chronic Kidney Disease, Stage 4. I have multiple cysts, but they are classified as simple cysts which probably will cause no problem.
Please keep us informed about your dad. I will keep him in my prayers.