Morphology and Clinical Presentation of Duplicate External
Auditory Canal-Literature Review
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Abstract
First branchial cleft anomalies (FBCA) such as duplication of the external auditory canal are due to failure to
obliterate the ventral portion of the 1st cleft while external auditory canal stenosis and atresia are abnormalities
of the dorsal portion.The annual incidence is 1:1000,000 and it’s been found to be commoner among females
69% than males 31% with the left ear most affected.FBCA can present as fistula, sinus or cysts located
around/along the EAC, periauricular region and the neck above the hyoid bone