Facial canal dehiscence rate: a retrospective analysis of 372 chronic otitis media cases
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This study aimed to investigate the rate and location of facial canal dehiscence (FCD) observed during surgery for chronic otitis media (COM) with or without cholesteatoma.
Material and method
Operative details of 1296 patients who underwent chronic otitis media surgery from January 2000 to January 2017 by the same surgeon were included in this retrospective study focusing on intraoperative observations of FCD.
Because of the type of the surgery, the Fallopian canal could not be seen completely, so 924 of the cases which only involved performing a tympanoplasty were not included in the study. A total of 372 patients (196 males and 176 females) who had a canal wall down (CWD) or canal wall up (CWU) mastoidectomy were included in the study. A CWD mastoidectomy was performed on 250 patients, while 122 patients underwent a CWU mastoidectomy. The prevalence of FCD was 11.29% (42/372 patients). The dehiscence was more common in patients with cholesteatoma (n = 37; 88.1%) than those with non-cholesteatoma (n = 5; 11.9%). The tympanic segment (n = 32; 76.19%) was the most common location for FCD. When we compared the ossicular erosion results of the cases that had FCD, erosion in three ossicles together was more statistically significantly frequent than the other possibilities.
It is possible to see FCD because of COM, especially with cholesteatoma. FCD is most commonly seen around the oval window. If stapes or all three ossicles are eroded, the surgeons must be more careful regarding FCD to be more effective in preventing facial nerve damage.
KeywordsFacial nerve Fallopian canal Dehiscence Ossicles
We thank to SY for his help on statistical evaluations of the data. We thank to Prof. HA for her revision on statistical analysis.
They have no funding to disclose.
Compliance with ethical standards
This study was retrospectively data analysis study and it did not need to informed consent. This retrospective study was performed after approval of local ethic committee.
Conflict of interest
The authors declare that they have no conflict of interest.
Human and animal rights statement
The study has been approved by the Ethical Committee of the University Hospital and has been performed according to the ethical standards of the Helsinki Declaration. Because of it was a retrospective study, formal consent was not required. We declare that all authors have contributed to, read and approved the final manuscript for submission.
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