Abstract
Congenital duplication of mastoid segment of facial nerve in child candidate for Cochlear Implantation Surgery: a rare case report.
Highlights
Duplication of the facial nerve is a very rare anomaly which is commonly associated with middle and inner ear anomalies
Tympanic segment of facial nerve may be caudally displaced and overlying the oval window putting it at risk for injury during surgery.[8,9]
Bifurcation of tympanic segment of the facial nerve usually occurs adjacent to oval window, with reunion of bifid segments distal to stapes or at posterior genu
Summary
Duplication of the facial nerve is a very rare anomaly which is commonly associated with middle and inner ear anomalies. It can involve any segment of the intratemporal facial nerve. It is important to look for this anomaly in all patients with congenital deafness and ear anomalies Preoperative evaluation of this anomalies especially in cochlear implantation surgery is important to avoid inadvertent nerve injury and in recognizing associated middle and inner ear anomalies. HRCT temporal bone showed normal external auditory canal, middle ear ossicles, cochlea, vestibule, and semicircular canals. There was no duplication of tympanic and labyrinthine segments of the facial nerve [Fig. 3]
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