Adenoids: A collection of lymphoid nodules on the posterior wall and roof of the NASOPHARYNX.Adenoidectomy: Excision of the adenoids. (Dorland, 28th ed)Palatine Tonsil: A round-to-oval mass of lymphoid tissue embedded in the lateral wall of the PHARYNX. There is one on each side of the oropharynx in the fauces between the anterior and posterior pillars of the SOFT PALATE.Otitis Media with Effusion: Inflammation of the middle ear with a clear pale yellow-colored transudate.Tonsillectomy: Surgical removal of a tonsil or tonsils. (Dorland, 28th ed)Mouth Breathing: Abnormal breathing through the mouth, usually associated with obstructive disorders of the nasal passages.Nasopharyngeal Diseases: Pathological processes involving the NASOPHARYNX.Nasal Obstruction: Any hindrance to the passage of air into and out of the nose. The obstruction may be unilateral or bilateral, and may involve any part of the NASAL CAVITY.Hypertrophy: General increase in bulk of a part or organ due to CELL ENLARGEMENT and accumulation of FLUIDS AND SECRETIONS, not due to tumor formation, nor to an increase in the number of cells (HYPERPLASIA).Bacteria, AerobicNasopharynx: The top portion of the pharynx situated posterior to the nose and superior to the SOFT PALATE. The nasopharynx is the posterior extension of the nasal cavities and has a respiratory function.