Case Report: Simultaneous repair of cerebrospinal fluid otorrhea and cochlear implantation in a patient with single-sided deafness and inner ear anomaly

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A 5-year-old boy presented with recurrent headaches and clear nasal discharge, leading to the diagnosis of cerebrospinal fluid otorrhea.
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Magnetic resonance imaging revealed descent of the cerebellar tonsils and cerebrospinal fluid signal in the left middle ear.
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The patient had profound sensorineural hearing loss in the left ear due to an incomplete partition type I inner ear malformation.
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Surgical management included mastoidotomy, repair of the CSF leak, and concurrent cochlear implantation.
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Postoperative results showed no recurrence of CSF otorrhea and restored hearing with an average threshold of 31 dB HL in the left ear.

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