A colonoscopy is the gold standard screening method for colorectal cancer, according to retired Bermudian gastroenterologist Victor Scott.

In this method a thin, lighted flexible tube called an endoscope is inserted through the rectum.

The endoscope has a small video camera attached to it. This allows the physician to see inside the bowel.

In screening for colorectal cancer, the physician will be looking for tumours and/or polyps.

Polyps are growths on the intestinal lining.

If polyps are detected they can be removed in a polypectomy or a biopsied.

To see a computer-generated colonoscopy procedure visit: www.youtube.com/watch?v=WHFRCrPj0SQ&feature=youtube_gdata.