An abnormal course of the facial nerve canal, overlying stapes and oval window:
- blue arrow: expected location of the facial nerve canal, tympanic portion, below the lateral semicircular canal, and superior and lateral to the oval window
- orange arrow: actual aberrant location
The 1st and 3rd portions of the facial nerve canal are normal.
No external ear anomalies, no ossicular chain ankylosis nor disruption, no inflammatory changes, no internal ear anomalies which could have caused conductive hearing loss are seen.
There is associated oval window and stapes dysplasia.