otosclerosis is dense lamellar bone lost due to focal bone cells and blood vessels to be rich in sponge-like new bone substitution produce the disease. the clinical manifestations of slowly progressive bilateral hearing loss, the pace of development varies, can be faster or slower, stop-time forward, the ears are not parallel. may have willis (willis) mistook this, patients often feel that hearing in a noisy environment than in a quiet environment, anti-as well. most patients have a low profile tinnitus, hearing loss the same time or prior to the emergence of persistence. some patients with dizziness.