Welcome uptight,
As you understand bladder cancer is a nasty thing. Be thankful that your doctors are doing the right test (CT scan) and are ahead of any curve balls thrown at you. Low grade bladder tumors have a fairly high recurrence to where most URU's use the words watching and waiting. Low grade is still better than high grade and still can be knocked out. Yes, the kidney "something" is concerning but, they are being cautious and examining is the right thing to do. Waiting is no fun but, I have learned to try and take "one day at a time". It can easily be nothing, a cyst, old calcified blood, yes a growth and that might not even be cancer. Key here is everything is treatable and beatable per early detection. Feel free to post as you go. The good, bad, questions rants etc. Someone will be around to listen.