Adenoids, or pharyngeal tonsils, are folds of lymphatic tissue covered by ciliated epithelium. They are found in the roof and posterior wall of the nasopharynx at the back of the throat behind the uvula.
Adenoids are part of the immune system, as they trap inhaled viruses and produce antibodies, particularly in children. This function decreases with age as the adenoids shrink. Because of this, the problems caused by enlarged adenoids rarely occur in adults.
The condition where hypertrophy of the pharyngeal tonsils occurs is also referred to as adenoids. Enlarged adenoids can obstruct breathing through the nose, and it is common when this happens for them to be surgically removed in a procedure called adenoidectomy. This procedure is carried out through the mouth under a general anaesthetic and involves the adenoids being curetted or cauterised.
Sleep apnea, recurrent infection of the adenoids, or distorted speech are also reasons for adenoidectomy. The procedure is often carried out at the same time as a tonsillectomy. Adenoidectomy is also performed on patients who have chronic ear infections caused by the adenoids blocking the eustachian tube.
In Roald Dahl's autobiography Boy: Tales of Childhood, the removal of his adenoids as a child is described. At that time, no anaesthetic was used.
The 1911 Encyclopædia Britannica suggested:
"Operations should not be performed in cold weather or in piercing east winds, and it is advisable to keep the child indoors for a day or two subsequent to its performance. To expose a child just after operating on his throat to the risks of a journey by train or omnibus is highly inadvisable."
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