[The seromucous tympanum].
In children who underwent adenoidectomy, paracentesis or tympanotomy with tube insertion, secretory otitis media continued in about 30% of 397 ears. In order to prevent degenerative changes of the ear-drum repeated insertion of ventilation tubes had to be performed. Anatomical peculiarities, malformations, hyperplastic adenoids and tonsils, infection of the paranasal sinuses and allergy are discussed as etiologic factors of SOM.