The Tonsilla Adenoidea, also known as the adenoids, are a mass of lymphatic tissue located at the back of the nasal cavity. Synonyms for the term include pharyngeal tonsils, nasopharyngeal tonsils, and adenoidal tissue. The adenoids play an important role in the body's immune system by filtering out bacteria and viruses that enter through the nose and mouth. However, when these tissues become infected or enlarged, they can lead to complications such as sleep apnea, chronic nasal congestion, and ear infections. Treatments for enlarged or infected adenoids range from medications to surgery depending on the severity of the condition.