Congenital bifurcation of the intratemporal facial nerve

Case contributed by Dr Piotr Gołofit

Presentation

Bilateral sensorineural hearing loss. Preoperative imaging before cochlear implantation.

Patient Data

Age: 3 years
Gender: Male

There are bilateral bifurcations of the labyrinthine segments of the left facial nerve and trifurcations of the mastoid segment of the right facial nerve. Bilateral stenoses of cochlear nerve canals. Incomplete partition of the left cochlea (type II).

Bifurcation of the labyrinthine and trifurcations of the mastoid segment of facial nerve. Cochlear nerve canal is stenotic. Cochlear nerve is absent.

Case Discussion

Facial nerve bifurcations are rare anomalies which can involve all segments of the nerve. The most common occur in the tympanic segment 1.

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