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microtia
Sign in to saveMicrotia is a congenital deformity where the auricle (external ear) is underdeveloped. A completely undeveloped auricle is referred to as anotia. Because microtia and anotia have the same origin, it can be referred to as microtia-anotia. Microtia can be unilateral (one side only) or bilateral (affecting both sides). Microtia occurs in 1 out of about 8,000–10,000 births. In unilateral microtia, the right ear is most commonly affected. It may occur as a complication of taking Accutane (isotretinoin) during pregnancy.
Key facts
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- Microtia
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- Unilateral grade III microtia (more often affecting the right ear).
via Wikipedia infobox
Article
10 sectionsContents
- Classification
- Causes and risk factors
- Diagnosis
- Treatment
- Hearing
- External ear
- Related conditions
- Notable cases
- References
- Further reading
Microtia is a congenital deformity where the auricle (external ear) is underdeveloped. A completely undeveloped auricle is referred to as anotia. Because microtia and anotia have the same origin, it can be referred to as microtia-anotia. Microtia can be unilateral (one side only) or bilateral (affecting both sides). Microtia occurs in 1 out of about 8,000–10,000 births. In unilateral microtia, the right ear is most commonly affected. It may occur as a complication of taking Accutane (isotretinoin) during pregnancy.
==Classification== thumb|Bilateral grade III microtia in a 9-year-old boy According to the Altman-classification, there are four grades of microtia: Grade I: A less than complete development of the external ear with identifiable structures and a small but present external ear canal. Grade II: A partially developed ear (usually the top portion is underdeveloped) with a closed stenotic external ear canal producing a conductive hearing loss. Grade III: Absence of the external ear with a small peanut-like vestige structure and an absence of the external ear canal and ear drum. Grade III microtia is the most common form of microtia. Grade IV: Absence of the total ear or anotia.