I?m a C5, 17 yrs. out. I?ve had a lot of problems w/leakage (through my urethra) caused by bladder spasms for the last 8 yrs. or so. My new urologist wants to do a cystoscopy to check for stones, but I?m concerned about stretching my urethra out, which I think would create a major problem. What are the chances of this happening?