Figure 3 shows the audiograms for the ears with fibrotic aural atresia. All the audiograms show a large airbone gap due to the aural atresia.
The findings of this study identify a factor that has not been considered in previous investigations, that of a fibrotic tissue pathway in ears with fibrotic aural atresia.
In the ear with fibrotic aural atresia, the connection of the fibrotic tissue to the ossicles contributes to more efficient sound transmission by means of CC.
Whereas it is recognized that the incidence of aural atresia is relatively low, with an estimated annual incidence of 0.6 cases per 100,000 inhabitants , the estimated number of new cases per year in the United States is 2,000, which is not an insignificant number.
Infectious Acute OM Chronic OM Cholesteatoma Herpes zoster oticus Lyme disease Traumatic Temporal bone fracture Iatrogenic injury Avulsion at brainstem Penetrating trauma Neoplastic Facial schwannoma Vestibular schwannoma Hemangioma Lipoma Glomus tumors Malignancy of skin/parotid Congenital Moebius syndrome Displacement (atresia) Aural atresia
CHARGE syndrome Dehiscence of FC Vascular MCA infarct Pontine artery infarct Lacunar infarct Idiopathic Bell's palsy Multiple sclerosis Sarcoidosis Inflammatory Guillain-Barre OM: otitis media; FC: fallopian canal; and MCA: middle cerebral artery.