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A cystoscopy is a medical procedure in which a doctor uses a slender, flexible scope to look inside the bladder. It¡¯s the best way we have right now to fully examine the bladder for tumors and to see whether or not?bladder cancer has come back.

We insert the scope through the urethra in the same way as a Foley catheter, a device that allows urine to be drained from the body. Both tubes are about the same size, but a cystoscope...