Radiological classification of the mastoid portion of the facial nerve: impact on the surgical accessibility of the round window in cochlear implantation

Mastoid portion of the facial nerve plays an important role in the round window approach of cochlear implantation. This study aimed to predict the anterior displacement of the mastoid portion of the facial nerve in the preoperative HRCT coronal cuts. We also aimed to detect the implication of anteri...

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Bibliographic Details
Published in:Acta oto-laryngologica 2021-09, Vol.141 (9), p.894-897
Main Authors: Mandour, Mahmoud, Elzayat, Saad, Elfarargy, Haitham H., Lotfy, Rasha, ELnaggar, Ahmed
Format: Article
Language:English
Subjects:
Child
Child, Preschool
cochlear implantation
Cochlear Implantation - methods
computed tomography scan
Facial nerve
Facial Nerve - anatomy & histology
Facial Nerve - diagnostic imaging
Female
Humans
Male
Mastoid - diagnostic imaging
Retrospective Studies
round window
Round Window, Ear
Tomography, X-Ray Computed
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Summary:Mastoid portion of the facial nerve plays an important role in the round window approach of cochlear implantation. This study aimed to predict the anterior displacement of the mastoid portion of the facial nerve in the preoperative HRCT coronal cuts. We also aimed to detect the implication of anterior displacement of MPFN on the R.W. accessibility through the posterior tympanotomy during cochlear implantation. It was a retrospective observational cohort study in tertiary referral hospitals. We included 246 pediatric patients who underwent cochlear implantation due to bilateral severe to profound SNHL through a posterior tympanotomy approach. Type I MPFN was present in 84 cases, type II MPFN was present in 149 patients, and type III MPFN was present in 13 cases. R.W. was inaccessible in 3 cases with MPFN type II and in 11 subjects with MPFN type III. There was a statistically significant difference regarding the R.W. accessibility between the three types of MPFN (p-value
ISSN:0001-6489
1651-2251
DOI:10.1080/00016489.2021.1963473