Abstract: Objective  To explore the surgical technique for cochlear implantation and simultaneous repair of cerebrospinal fluid (CSF) leaks in patients with incomplete partition type I (IP-I) combined with CSF leakage, as well as the postoperative control of CSF leaks and auditory-verbal rehabilitation outcomes. Methods  A retrospective analysis was conducted on the clinical data and postoperative follow-up results of 8 patients with IP-I combined with CSF otorrhea. All patients underwent cochlear implantation and simultaneous repair of CSF otorrhea via a transmastoid lateral semicircular canal approach. Antibiotic treatment was administered within the first week postoperation, and cochlear implants were activated one month post-surgery, followed by auditory-verbal rehabilitation training. Results  Cochlear implant electrodes were successfully implanted in all patients. The follow-up period ranged from 1 to 17 years, during which no patients experienced recurrent CSF otorrhea, and all patients had varying degrees of auditory benefit. Conclusions  The surgical method of cochlear implantation with simultaneous repair of CSF otorrhea via a transmastoid lateral semicircular canal approach effectively resolved  symptoms associated with IP-I combined with CSF leakage, prevented the recurrence of CSF leaks, and aided in hearing reconstruction.

Key words: incomplete partition type I, cerebrospinal fluid otorrhea, inner ear malformation, cochlear implantation