Anotia
Anotia
Anotia (pronounced: a-noh-tee-uh) is a rare congenital condition characterized by the absence of the external ear (pinna). It is derived from the Greek words "an" meaning without, and "otia" meaning ear.
Definition
Anotia is a severe form of microtia, a condition where the external ear is underdeveloped. In anotia, the external ear is completely absent. It can occur on one side (unilateral) or both sides (bilateral) and is often associated with other facial abnormalities.
Causes
The exact cause of anotia is unknown, but it is believed to be due to a disruption in blood supply to the ear during fetal development. Some studies suggest a genetic component, while others point to environmental factors such as maternal drug use, diabetes, or exposure to certain chemicals during pregnancy.
Symptoms
The primary symptom of anotia is the absence of the external ear. This can result in hearing loss, as the external ear plays a crucial role in collecting sound waves and directing them into the ear canal. Other symptoms can include facial asymmetry and difficulties with balance.
Treatment
Treatment for anotia typically involves reconstructive surgery to build an artificial ear. This is usually done when the child is older and their facial bones have fully developed. In some cases, a bone-anchored hearing aid (BAHA) may be used to improve hearing.
Related Terms
- Microtia: A condition where the external ear is underdeveloped.
- Otoplasty: A type of reconstructive surgery used to correct defects or deformities of the ear.
- Congenital: A term used to describe conditions that are present at birth.
- Bilateral: A term used to describe conditions that affect both sides of the body.
- Unilateral: A term used to describe conditions that affect one side of the body.
External links
- Medical encyclopedia article on Anotia
- Wikipedia's article - Anotia
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