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Distance between the middle turn of the cochlea and labyrinthine portion of the facial nerve: a surgical-radiological comparison and assessment of clinical importance

Published online by Cambridge University Press:  25 November 2021

R Lakhawat ,
M Grover ,
S Sharma ,
M Charan ,
N Lohar  and
S Samdani
R Lakhawat
Affiliation:
Department of Otorhinolaryngology and Head Neck Surgery, Sawai Man Singh (SMS) Medical College and Hospital, Jaipur, India
M Grover
Affiliation:
Department of Otorhinolaryngology and Head Neck Surgery, Sawai Man Singh (SMS) Medical College and Hospital, Jaipur, India
S Sharma*
Affiliation:
Department of Otorhinolaryngology and Head Neck Surgery, Sawai Man Singh (SMS) Medical College and Hospital, Jaipur, India
M Charan
Affiliation:
Department of Microbiology, Jawaharlal Nehru (JLN) Medical College, Ajmer, India
N Lohar
Affiliation:
Department of Otorhinolaryngology and Head Neck Surgery, Sawai Man Singh (SMS) Medical College and Hospital, Jaipur, India
S Samdani
Affiliation:
Department of Otorhinolaryngology and Head Neck Surgery, Sawai Man Singh (SMS) Medical College and Hospital, Jaipur, India
*
Author for correspondence: Dr Shivam Sharma, C-17, Deepak Marg, Adarsh Nagar, Sharma Hospital, Jaipur – 302004, Rajasthan, India E-mail: shivam92@hotmail.com
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Abstract

Objective

To highlight the close anatomical relationship between the middle turn of the cochlea and the labyrinthine segment of the facial nerve, which will be helpful to predict the probability of occurrence of facial nerve stimulation following cochlear implant surgery.

Methods

High-resolution computed tomography of 40 cadaveric temporal bones was performed, followed by microscopic dissection. Cochleo-facial distance was measured with the help of a Digital Imaging and Communications in Medicine (‘DICOM’) viewer on high-resolution computed tomography and by a millimetre scale in the dissected specimen.

Results

The cochleo-facial distance on high-resolution computed tomography was 0.62 ± 0.09 mm, ranging from 0.41 to 0.81 mm, and on dissection it was 0.57 ± 0.10 mm, ranging from 0.35 to 0.74 mm.

Conclusion

The labyrinthine segment is the most likely area of stimulation in patients suffering from facial nerve stimulation following cochlear implantation. Pre-operative high-resolution computed tomography of the temporal bone can be used to examine the bone separating the labyrinthine segment of the facial nerve from the middle turn of the cochlea. This has clinical significance regarding implant side selection and pre-operative patient counselling.

Keywords

CochleaCochlear ImplantsFacial NerveOtospongiosis
Type
Main Article
Information
The Journal of Laryngology & Otology , Volume 136 , Issue 5 , May 2022 , pp. 400 - 403
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of J.L.O. (1984) LIMITED

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Footnotes

Dr S Sharma takes responsibility for the integrity of the content of the paper

References

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