Acquired medial external auditory canal stenosis, anterior tympanomeatal angle blunting, and lateralized tympanic membrane: Nosology, diagnosis, and treatment.

Affiliation

Service ORL et chirurgie cervico-faciale, bâtiment B, hôpital Nord, CHU de Saint-Étienne, 42055 Saint-Étienne cedex 2, France. Electronic address: [Email]

Abstract

OBJECTIVE : To analyze the etiologies, auditory consequences, diagnostic tools and therapeutic results of three often confused pathologies: acquired fibrous stenosis of the medial part of the external auditory canal (EAC), fibrous anterior tympanomeatal angle blunting, and lateralized tympanic membrane.
METHODS : Retrospective study of 18 cases operated on over a 16-year period (14 patients: 7 female, 7 male; aged 11-64 years): 8 cases of medial EAC stenosis, 3 of blunting, and 7 of tympanic membrane lateralization.
RESULTS : In all 3 pathologies, otoscopic and radiologic diagnosis was easily established, so that they could not be confused. All 3 induced>33dB conductive hearing loss. Medial EAC stenosis was secondary to chronic inflammation of the EAC, aggravated by surgery in 5 cases. Blunting was secondary to surgery altering the anterior tympanic annulus. Tympanic membrane lateralization was secondary to prior surgery without inflammatory process. Underlying EAC cholesteatoma was found in 3 cases of medial stenosis and in 1 case of blunting. Surgical results were disappointing in medial stenosis, with 62.5% recurrence and mean functional gain of 9dB, and in blunting, with 66.7% recurrence and mean functional gain of 6dB; auditory results were, however, good in these 2 pathologies when there was no recurrence of fibrosis. Results were significantly better in lateralized tympanic membrane, with 28.6% recurrence and mean functional gain of 16dB.
CONCLUSIONS : The good results obtained in tympanic membrane lateralization seem to justify surgery in patients bothered by their hearing loss. The indication is more questionable in cases of medial fibrous stenosis and blunting, although significant auditory improvement is achieved in case of surgical success.

Keywords

Acquired medial external auditory canal stenosis,Anterior tympanomeatal angle blunting,Fibrosis,Inflammation,Lateralized tympanic membrane,

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