The surgical removal of an organ.

A narrowing of the opening between the stomach and the small intestine.

Severe irritation of the colon caused by Clostridium difficile bacterium. It occurs after taking oral antibiotics, which kill bacteria that normally live in the colon.

Damage to the small intestine from radiation therapy that likely results in malabsorption of nutrients and diarrhea.

The opening from the stomach into the top of the small intestine (duodenum).

Damage to the colon from radiation therapy.

The lower end of the large intestine leading to the anus.

A condition that occurs when gastric juices or small amounts of food from the stomach flow back into the esophagus and mouth. Also called regurgitation.

A condition in which the rectum slips so that it protrudes from the anus.

A condition that occurs when gastric juices or small amounts of food from the stomach flow back into the esophagus and mouth. Also called reflux.