The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study

Detalhes bibliográficos
Autor(a) principal: Mehanna,Ahmed Mohamed
Data de Publicação: 2020
Outros Autores: Abdelnaby,Moustafa Mohamed, Eid,Mohamed
Tipo de documento: Artigo
Idioma: eng
Título da fonte: International Archives of Otorhinolaryngology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1809-48642020000300288
Resumo: Abstract Introduction Over the last decades, there has been a tremendous increase in the number of cochlear implant recipients and, consequently, there is a recent increase of interest in the proper understanding of the anatomy of the round window (RW), which is the most important anatomical land mark during cochlear implant surgery. Objectives The present study was undertaken to assess the detailed surgical and radiological anatomy of the RW prechamber; its shape, directions, measurements, common anatomic variations, and its relationships with different surrounding structures as related to cochlear implantation. Methods A total of 20 cadaveric specimens of human temporal bone were microscopically dissected for the anatomical assessment of the measurements of the RW and its relation to surrounding structures in the tympanum. A total of 20 patients were subjected to cochlear implantation, and a radiological and surgical assessment of the anatomy of their RW prechambers was performed. Results The distances between the RW and the facial canal (FC), the jugular fossa (JF), the carotid canal (CC), and the oval window (OW) were measured. Among the cases subjected to cochlear implantation, the infracochlear tunnel was studied radiologically; the lengths of the anterior and posterior pillars were assessed, and the relation with the direction at which the RW faces was statistically analyzed. Conclusions Proper understanding of the topographic anatomy of the RW, including its direction of opening and the distances from different adjacent structures in the tympanum, is essential for a successful cochlear implantation surgery, since it can help decision-making before the surgery and is useful to avoid many complications, such as misplaced electrode and iatrogenic injury to the surrounding structures.
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spelling The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical StudyCochlear Implantationfacial nervemiddle earcochleaAbstract Introduction Over the last decades, there has been a tremendous increase in the number of cochlear implant recipients and, consequently, there is a recent increase of interest in the proper understanding of the anatomy of the round window (RW), which is the most important anatomical land mark during cochlear implant surgery. Objectives The present study was undertaken to assess the detailed surgical and radiological anatomy of the RW prechamber; its shape, directions, measurements, common anatomic variations, and its relationships with different surrounding structures as related to cochlear implantation. Methods A total of 20 cadaveric specimens of human temporal bone were microscopically dissected for the anatomical assessment of the measurements of the RW and its relation to surrounding structures in the tympanum. A total of 20 patients were subjected to cochlear implantation, and a radiological and surgical assessment of the anatomy of their RW prechambers was performed. Results The distances between the RW and the facial canal (FC), the jugular fossa (JF), the carotid canal (CC), and the oval window (OW) were measured. Among the cases subjected to cochlear implantation, the infracochlear tunnel was studied radiologically; the lengths of the anterior and posterior pillars were assessed, and the relation with the direction at which the RW faces was statistically analyzed. Conclusions Proper understanding of the topographic anatomy of the RW, including its direction of opening and the distances from different adjacent structures in the tympanum, is essential for a successful cochlear implantation surgery, since it can help decision-making before the surgery and is useful to avoid many complications, such as misplaced electrode and iatrogenic injury to the surrounding structures.Fundação Otorrinolaringologia2020-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1809-48642020000300288International Archives of Otorhinolaryngology v.24 n.3 2020reponame:International Archives of Otorhinolaryngologyinstname:Fundação Otorrinolaringologia (FORL)instacron:FORL10.1055/s-0039-1698783info:eu-repo/semantics/openAccessMehanna,Ahmed MohamedAbdelnaby,Moustafa MohamedEid,Mohamedeng2020-08-26T00:00:00Zoai:scielo:S1809-48642020000300288Revistahttps://www.scielo.br/j/iao/https://old.scielo.br/oai/scielo-oai.php||iaorl@iaorl.org||archives@internationalarchivesent.org||arquivos@forl.org.br1809-48641809-4864opendoar:2020-08-26T00:00International Archives of Otorhinolaryngology - Fundação Otorrinolaringologia (FORL)false
dc.title.none.fl_str_mv The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
title The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
spellingShingle The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
Mehanna,Ahmed Mohamed
Cochlear Implantation
facial nerve
middle ear
cochlea
title_short The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
title_full The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
title_fullStr The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
title_full_unstemmed The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
title_sort The Anatomy and Anatomical Variations of the Round Window Prechamber and Their Implications on Cochlear Implantation: An Anatomical, Imaging, and Surgical Study
author Mehanna,Ahmed Mohamed
author_facet Mehanna,Ahmed Mohamed
Abdelnaby,Moustafa Mohamed
Eid,Mohamed
author_role author
author2 Abdelnaby,Moustafa Mohamed
Eid,Mohamed
author2_role author
author
dc.contributor.author.fl_str_mv Mehanna,Ahmed Mohamed
Abdelnaby,Moustafa Mohamed
Eid,Mohamed
dc.subject.por.fl_str_mv Cochlear Implantation
facial nerve
middle ear
cochlea
topic Cochlear Implantation
facial nerve
middle ear
cochlea
description Abstract Introduction Over the last decades, there has been a tremendous increase in the number of cochlear implant recipients and, consequently, there is a recent increase of interest in the proper understanding of the anatomy of the round window (RW), which is the most important anatomical land mark during cochlear implant surgery. Objectives The present study was undertaken to assess the detailed surgical and radiological anatomy of the RW prechamber; its shape, directions, measurements, common anatomic variations, and its relationships with different surrounding structures as related to cochlear implantation. Methods A total of 20 cadaveric specimens of human temporal bone were microscopically dissected for the anatomical assessment of the measurements of the RW and its relation to surrounding structures in the tympanum. A total of 20 patients were subjected to cochlear implantation, and a radiological and surgical assessment of the anatomy of their RW prechambers was performed. Results The distances between the RW and the facial canal (FC), the jugular fossa (JF), the carotid canal (CC), and the oval window (OW) were measured. Among the cases subjected to cochlear implantation, the infracochlear tunnel was studied radiologically; the lengths of the anterior and posterior pillars were assessed, and the relation with the direction at which the RW faces was statistically analyzed. Conclusions Proper understanding of the topographic anatomy of the RW, including its direction of opening and the distances from different adjacent structures in the tympanum, is essential for a successful cochlear implantation surgery, since it can help decision-making before the surgery and is useful to avoid many complications, such as misplaced electrode and iatrogenic injury to the surrounding structures.
publishDate 2020
dc.date.none.fl_str_mv 2020-09-01
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dc.relation.none.fl_str_mv 10.1055/s-0039-1698783
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dc.publisher.none.fl_str_mv Fundação Otorrinolaringologia
publisher.none.fl_str_mv Fundação Otorrinolaringologia
dc.source.none.fl_str_mv International Archives of Otorhinolaryngology v.24 n.3 2020
reponame:International Archives of Otorhinolaryngology
instname:Fundação Otorrinolaringologia (FORL)
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reponame_str International Archives of Otorhinolaryngology
collection International Archives of Otorhinolaryngology
repository.name.fl_str_mv International Archives of Otorhinolaryngology - Fundação Otorrinolaringologia (FORL)
repository.mail.fl_str_mv ||iaorl@iaorl.org||archives@internationalarchivesent.org||arquivos@forl.org.br
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