thank you for your update. Obviously, recurrence is something none of us want to hear about. I'm sorry you are experiencing it. I am also not a medically trained oncologist, just a nerdy caregiver. Here is my understanding of your inquiry:
Necrosis is the death of cells of an organ or tissue, usually due to disease, injury, or failure of blood supply.
How was your initial tumor removed? Injury may have been caused to the tissue around the tumor as a result of TURBT. Ironically, cancer cells are cells whose programmed cell-death malfunctions and causes uninhibited growth. You are exhibiting cells that are dying.
I would ask your medical team if this is normal to see after your procedures. I would also ask if that is an indicator that cancer cells were missed the first time, which may have since caused injury to the tissue around the old tumor. I would also ask for scenarios in which this type of necrosis would be witnessed. Be sure you are satisfied with the answers you hear, and always feel free to use our community as a sounding board.
Praying for miraculous ease and recovery for you! All my best, Charles (Moderator / BladderCancer.net)