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Aural Atresia and Microtia

What is Aural Atresia / Canal Stenosis?

Aural atresia refers to the absence an external ear canal. When someone has aural atresia, there is a high incidence of malformation of the external ear and middle ear also, but the inner ear and auditory nerve are frequently normal.

A narrowed ear canal (i.e. one where the eardrum can be viewed, but the canal is narrower than normal) is sometimes referred to as a stenotic canal, or canal stenosis.

Aural atresia most commonly effects just one ear (unilateral), but can occur both ears (bilateral).

Atresia can be a symptom of a larger syndrome, such as Treacher Collins, Crouzon's, Alpert's, Preiffer, Klippel-Feil, BOR (Branchio-Oto-Renal), 18-q chromosome, as well as Hemifacial Microsomia.

What is Aural Atresia? - http://www.microtia.com/whatis.html
The Microtia And Aural Atresia Division of the IRPS - http://www.irps.net/microtiainfo.html
EMedicine – Aural Atresia - http://author.emedicine.com/ped/topic167.htm

What is Microtia

Microtia literall translates from the Latin to mean “small ear” Microtia varies from the complete absence of the ear (which is referred to as anotia) to a somewhat normal but small ear. Visit http://www.earsurgery.com/pages/variations.html to see good pictures of the various grades of microtia (Figure 5).

Microtia Statistics:

• Nearly twice as frequent in males as in females
• Averages occurrence is 1 in 6,000 when averaged across all ethnic groups
• Approximately 60 % unilateral right, 30 % unilateral left, 10 % bilateral

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