Prediction of Intraoperative CSF Gusher and Postoperative Facial Nerve Stimulation in Patients With Cochleovestibular Malformations Undergoing Cochlear Implantation Surgery.

Objective: To determine parameters in computed tomography (CT) of the temporal bone that would be useful for prediction of cerebrospinal fluid (CSF) gusher during cochlear implantation (CI) surgery and postoperative facial nerve stimulation (FNS) in patients with inner ear malformations. Study Design: Retrospective study. Setting: Tertiary referral center. Patients: Three hundred seventy-five cases who had undergone CI surgery including 54 inner ear malformation cases were analyzed. Main Outcome Measures: The diameters of the cochlea modiolar base and porus of the internal auditory canal (IAC), length of IAC, diameter of the vestibular aqueduct (VA) at the operculum, and presence or absence of the modiolus of the cochlea were evaluated by using CT. Results: CSF gusher occurred in 12 (22%) cases, in whom the diameters of the cochlea modiolar base (2.7 +/- 0.6 mm, p

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