I must be luckier at colonospies than the lottery.  Had my first at age 51 and removed a small polyp (the only polyp found).  The Dr thought was it no big deal but determined to be cancerous after a biopsy.  A follow-up to ensure clean "margins" around the area and no problems in subsequent colo's every 5 years.  I'd pay for my kids to have one if insurance didn't.