Loss of auricle, also known as microtia or anotia, is a congenital malformation of the ear in which the external ear (auricle) is underdeveloped and either abnormally shaped (microtia) or absent (anotia). The external ear canal may also be atretic (absent). The severity of microtia ranges from a measurably small external ear with minimal structural abnormality to an ear that consists of few rudimentary structures and an absent or blind-ending external ear canal.
The exact cause of loss of auricle is not fully understood, but it is believed to be due to a combination of genetic and environmental factors. Some possible causes include:
The symptoms of loss of auricle can vary depending on the severity of the malformation. Some common symptoms include:
Diagnosing loss of auricle involves a thorough physical examination of the ear and surrounding structures. Imaging studies, such as computed tomography (CT) scans, may also be performed to evaluate the extent of the malformation and to assess the inner ear and hearing function. Hearing tests may also be conducted to evaluate the extent and nature of hearing loss.
Description | Percentage |
---|---|
Complete loss of both |
50 |
Description | Percentage |
---|---|
Complete loss of one |
30 |
Description | Percentage |
---|---|
Deformity of one, with loss of one-third or more of the substance |
10 |
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