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Exostosis of the external auditory canal

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 5
أستاذ المادة مثنى سليم عبدالامير الحميدي       23/05/2017 09:59:47
Exostosis of the external auditory canal

DEFINITION
An exostosis is a benign growth of periosteal bone, which forms a smooth, sessile, hemispherical swelling in the deep part of the meatus, adjacent to the tympanic membrane.
Exostoses are usually multiple, occurring in a group of three, and are bilateral. They may arise from the anterior and posterior walls of the external auditory canal. They are usually found as an incidental finding during the examination of an asymptomatic patient.
There is evidence that prolonged exposure to cold water in the external auditory canal leads to increasing size and incidence of exostoses.

DIAGNOSIS
The diagnosis of exostoses is usually made clinically from the characteristic otoscopic appearances of multiple and usually bilateral sessile, hemispherical, bony swellings arising deep in the external auditory canal, adjacent to the tympanic membrane. It is usually straightforward to differentiate them from an osteoma, which is generally a unilateral, solitary, discrete, pedunculated mass, arising from the lateral part of the bony external auditory canal.
Exostoses are generally an incidental finding and asymptomatic when small.

MANAGEMENT OPTIONS
In the majority of cases, no treatment is required as the patient is asymptomatic. However, general advice about avoidance of cold water should be given, with a recommendation to use earplugs or a wet suit hood, for water sports.
Hearing loss due to debris collection, or otitis externa, can be managed medically, by meticulous aural toilet using a microscope and suction. Topical application of steroid, antibiotic, antifungal or combination ear drops, may be necessary to treat inflammation or infection.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .