Objective: Presence of some auricular structures, but none of these structures conform to recognized ear componentsComments:
The definitions of microtia below follow a widely used, surgically based, classification of ear anomalies outlined by Weerda . As microtia indicates at least both decreased length and width, and in more severe forms it includes abnormal shape of structures, all forms are acknowledged to be bundled terms, but are retained here because they are well established.
This malformation is commonly associated with atresia of the external canal, but that anomaly should be coded separately. Complete absence of the ear should be coded as Anotia.