Anus

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.

Colon
KO-lun (WAV-32K)

The long, coiled, tube-like organ (also known as large bowel or large intestine) that removes water from digested food. The remaining material, solid waste called "stool," moves through the colon and the rectum and leaves the body through the anus. Parts of the colon include: cecum, ascending colon, transverse colon, descending colon, and sigmoid colon.

Colonoscope
ko-LON-o-skope (WAV-40K)

A flexible, lighted instrument with a built-in tiny camera used to view the inside of the entire colon and rectum.

Colonoscopy
ko-lon-OS-ko-pee (WAV-54K)

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.

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Colorectal
ko-lo-REK-tul (WAV-42K)

Related to the colon, rectum, or both.

Double Contrast Barium Enema
(WAV-66K)

A series of x-rays of the colon and rectum. The x-rays are taken after the patient is given an enema containing a dye called "barium," followed by an injection of air. The barium outlines the intestines on the x-rays, allowing many abnormal growths to be visible.

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Fecal occult blood test
FEE-kul o-KULT (WAV-70K)

A test to check for hidden blood in stool. Fecal refers to stool. Occult means hidden. Sometimes called "F.O.B.T." (also see stool test)

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Flexible Sigmoidoscopy
sig-moid-OSS-ko-pee (WAV-52K)

Also called proctosigmoidoscopy. A procedure in which the doctor looks inside the rectum and the lower portion of the colon (sigmoid colon) through a flexible, lighted tube called a sigmoidoscope. The doctor may collect samples of tissue or cells for closer examination and remove some polyps within view.

Gastroenterologist
GAS-tro-en-ter-OL-o-jist (WAV-66K)

A doctor who specializes in diagnosing and treating disorders of the digestive system (which includes the esophagus, stomach, pancreas, intestines, and liver).

Gastrointestinal tract
GAS-tro-in-TES-ti-nul (WAV-62K)

The part of the digestive tract where the body processes food and eliminates waste. It includes the esophagus, stomach, liver, intestines, and rectum.

Intestine

A long, tube-shaped organ, also called the bowel, in the abdomen that completes the process of digestion. There are both a large and small intestine.

Polyp
(WAV-36K)

An abnormal, often precancerous growth of tissue (colorectal polyps are growths of tissue inside the intestine).

Rectum
(WAV-22K)

The last 8 to 10 inches of the large intestine. The rectum stores solid waste until it leaves the body through the anus.

Screening Test

Screening tests are tests used to check, or screen, for disease when there are no symptoms. Screening tests for colorectal cancer include: fecal occult blood test, flexible sigmoidoscopy, colonoscopy, and double contrast barium enema.

Sigmoidoscope
sig-MOY-da-skope (WAV-48K)

A flexible, lighted instrument with a built-in tiny camera that allows the doctor to view the lining of the rectum and lower half of the colon.

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Stool
(WAV-30K)

The waste matter discharged in a bowel movement; feces.

Stool test

A test to check for hidden blood in the bowel movement. (also see fecal occult blood test)

Sources for definitions: National Cancer Institute and Centers for Disease Control and Prevention.