Mondini Deformity Treatment & Management

Updated: Nov 24, 2021
  • Author: Adam E Singleton, MS; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Approach Considerations

Because of the root cause of the sensorineural hearing loss in patients with Mondini deformity, surgical therapy is the only treatment consideration.


Cochlear Implantation

Cochlear implantation has been described as an effective tool for treating sensorineural hearing loss due to incomplete partitioning. [4, 5]

Prior to surgery, imaging (specifically MRI) of the affected temporal bone is important to ascertain the presence of sufficient cochlear lumen for electrode placement and to assess for hypoplasia/aplasia of the eighth cranial nerve. [21]

Another concern for surgery is whether there is any aberrancy in the course of the facial nerve. Sixteen percent of individuals with inner-ear malformations were found to have an aberrant facial nerve. [20] “Gushers,” or oozing of cerebrospinal fluid (CSF) due to bony abnormalities found in the cribriform plate separating the internal auditory canal and the cochlea, have also been described in patients with incomplete partitioning. Oozing CSF more seems to be more common in patients with Mondini deformity. [22]

As for electrode selection for patients with Mondini deformity, because the basal turn is normal and research has shown that the majority of spiral ganglion cells reside in the basal turn, all types of electrodes should theoretically provide sufficient stimulation. [22]

Chen et al found that following cochlear implant surgery in 545 children (aged 7-36 mo) with severe to profound, prelingual hearing loss, auditory skills in the 31 patients with Mondini dysplasia developed similarly to those in the 514 patients with radiologically normal inner ears. No significant difference was found at 12-, 24-, and 36-month follow-up in the mean auditory skill scores for both groups. [23]



Patients diagnosed with Mondini deformity should consult with a neurootologist to ascertain whether cochlear implantation is warranted. Additionally, an audiologist and speech/language pathologist should be consulted.


Long-Term Monitoring

Oozing of CSF due to the abnormal bony architecture of the inner ear has been reported among patients with Mondini deformity who have undergone cochlear implantation. Because these patients now have an inner ear in which CSF is exposed to perilymph, meningitis is an increased risk, so these patients should receive routine vaccinations. [22]