Middle ear operation for the purpose of improvement of hearing.
D004432:Ear, Middle / Q000601:surgery*; D006309:Hearing; D006311:Hearing Disorders / Q000209:etiology*; D006320:Hearing Tests; D006801:Humans; D010033:Otitis Media / Q000150:complications*
EAR, MIDDLE/surgery; HEARING DISORDERS/etiology and pathogenesis; OTITIS MEDIA/complications