Printer Friendly

Partial medial canal fibrosis.

A 31-year-old woman presented with chronic drainage from the left ear. Her condition had not resolved with oral and topical antibiotics.

The otoscopic appearance of the left eardrum was similar to that seen in a case of tympanic membrane perforation, but the pathology was much more lateral and the eardrum could be visualized through the circumferential fibrotic tissue involving the ear canal (figure 1). Findings on audiometry and tympanometry of the left ear were normal. Computed tomography (CT) of the temporal bone demonstrated the fibrotic tissue band lateral to the tympanic membrane (figure 2). The patient underwent surgery, the fibrotic tissue was removed, and a canaloplasty was performed.

[FIGURES 1-2 OMITTED]

Medial canal fibrosis is more common in females than males, and it may be seen at any age. Among the causative factors that have been implicated are chronic infection, hearing aid use, and surgical trauma. Over time, chronic inflammation leads to the formation of granulation tissue in the ear canal, and the granulation eventually matures into dense fibrotic tissue.

A careful physical examination is of utmost importance in establishing the diagnosis. In patients with complete medial canal fibrosis, the external ear canal appears to be shortened by a skin-covered barrier that may resemble a lateralized tympanic membrane. Findings on the physical examination will vary according to the degree of severity in cases of partial fibrosis. CT is useful for evaluating the extent of the pathology.

Suggested reading

Birman CS, Fagan PA. Medial canal stenosis--Chronic stenosing external otitis. Am J Otol 1996:17:2-6.

el-Sayed Y. Acquired medial canal fibrosis. J Laryngol Otol 1998:112: 145-9.

Slattery WH III, Saadat R Postinflammatory medial canal fibrosis. Am J Otol 1997:18:294-7.

Adrien A. Eshraghi, MD; S. Arif Ulubil, MD

From the University of Miami Ear Institute, Department of Otolaryngology, University of Miami Miller School of Medicine.
COPYRIGHT 2006 Vendome Group LLC
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2006, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:OTOSCOPIC CLINIC
Author:Ulubil, S. Arif
Publication:Ear, Nose and Throat Journal
Article Type:Brief Article
Date:Feb 1, 2006
Words:306
Previous Article:World Health Organization classification of tumours: pathology and genetics of head and neck tumours.
Next Article:Endoscopic view of an obstructing polyp of the uncinate fold.
Topics:


Related Articles
Attic cholesteatoma with extension into the tympanum.
Poorly performed modified radical mastoidectomy.
Fibrous dysplasia of the temporal bone.
Large osteoma of the external auditory canal.
Chronic external otitis.
Chondroma in the bony external ear canal. (Otoscopic Clinic).
Eosinophilic angiocentric fibrosis in a patient with nasal obstruction.
Complete medial canal fibrosis.
Exostosis of the external auditory canal.
External auditory canal cholesteatoma: a rare entity.

Terms of use | Copyright © 2017 Farlex, Inc. | Feedback | For webmasters