The opening of the rectum to the outside of the body. Cancer A disease in which cells grow out of control.
Cancer cells can invade nearby tissue and spread to other parts of the body.
A flexible, lighted instrument with a built-in tiny camera used to view the inside of the entire colon and rectum. An examination in which the doctor looks at the internal walls of the entire colon through a flexible, lighted instrument called a colonoscope. The doctor may collect samples of tissue or cells for closer examination. The doctor may also remove polyps during colonoscopy. Related to the colon, rectum, or both.