Conductive hearing loss due to facial nerve aberrant canal and oval window dysplasia

Discussion:

Facial nerve overlying the stapes footplate is a rare cause of congenital conductive hearing loss.
Stapes and oval window dysplasia are often associated and can be explained on an embryologic basis.

Possible differential diagnoses leading to misdiagnose of oval window dysplasia:

  • Fenestral otosclerosis: different clinical history and a different evolutive course on imaging
  • tympanosclerosis due to inflammatory changes: inflammatory changes are the main findings
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