Preoperative CT Assessment in CI: Dehiscence of the Labyrinthine Segment of the Facial Nerve Causing Facial Nerve Stimulation
Cochlear implantation (CI) is indicated in patients with severe sensorineural hearing loss (SNHL). Facial nerve stimulation (FNS) is a complication which occurs after 0.9 to 14% of CI surgery (1). Patients at risk for FNS usually have cochlear malformations, a history of temporal bone fractures, or preexisting otologic diseases, e.g., otosclerosis (2,3). We present an unusual case in which a patient, without preexisting otologic diseases or known anatomic variations, developed FNS due to a dehiscence at the middle cochlear turn.