Hi Dap,

I am under bladder surveillance due to the removal of my kidney, ureter, adrenal gland and bladder cuff. First cytoscopy since surgery in August 2022 showed multiple areas of erythemia. My current urologist asked if I had the bladder washed in Metomycin after surgery. Then said something about BCG treatment which is a tuberculous virus that is injected into the bladder and stops surface cancer cells dead.
https://www.cancer.org/cancer/bladder-cancer/treating/intravesical-therapy.html
If your cancer cells were on the surface, perhaps this was what happened.

Remember it is your body, you need to know, so demand the complete information from the doctor.