An endoscope is a flexible fiberoptic scope with a light that helps a doctor see inside certain internal organs. When the scope is inserted through the mouth, the lining of the esophagus, stomach, and upper duodenum can be visually examined for any abnormalities or growths. An endoscope allows the doctor to take a biopsy of any suspicious areas.
Reviewed By: Gordon A. Starkebaum, MD, MACR, ABIM Board Certified in Rheumatology, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.