Adenoids are masses of tissue located high on the rear wall of the throat (pharynx). They are made up of lymphatic tissue, which trap and destroy pathogens in the air that enters the nasopharynx.
Reviewed last on: 12/1/2008
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.