Microtia
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Microtia refers to a small pinna of the ear, when is it completely absent it is termed anotia.
Epidemiology
The estimated incidence at around 1:9000 live births. It is more common in males and there is a recognised right sided predilection.
Pathology
Associations
Microtia can be associated with a wide spectrum of inner and middle ear anomalies 1. Isolated microtia is relatively uncommon. The most frequent associations include:
Wider organ associations include:
- renal anomalies
Syndromic associations include:
Classification
It is classified into four grades based on increasing severity:
- grade I: slightly small ear with identifiable structures; external auditory canal small but present
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grade II: partial or hemiear with
aan occluded or 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 eardrum
- grade IV: complete absence (anotia)
-<strong>grade II: </strong>partial or hemiear with a occluded or stenotic external ear canal producing a conductive hearing loss </li>- +<strong>grade II: </strong>partial or hemiear with an occluded or stenotic external ear canal producing a conductive hearing loss </li>
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