We confirmed the results of previous studies showing that 8.5 patients must be treated with a single instillation to prevent 1 recurrence. Furthermore, our data may indicate that only small recurrences are prevented, which could easily be fulgurated using local anesthesia at followup cystoscopy. The benefit of single instillations can be questioned if this finding is confirmed by others.

Total costs may be very high for a cystectomy with complications. Peri-operative blood loss was the most important factor associated with high total hospital costs for radical cystectomy due to bladder cancer. If the amount of bleeding can be influenced then substantial reductions in the total costs of cystectomy would seem possible.

Routine postoperative urography is not necessary in patients who have a normal postoperative course after cystectomy and urinary diversion.