Cargando…

Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study

Introduction  Sigmoid sinus (SS) variations have been classified variously in the literature. These classifications suffer from some form of shortcoming from a clinical point of view for their application. Objective  We propose a clinically relevant classification of the SS in relation to the poster...

Descripción completa

Detalles Bibliográficos
Autores principales: Singh, Anup, Irugu, David Victor Kumar, Sikka, Kapil, Verma, Hitesh, Thakar, Alok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Thieme Publicações Ltda 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6660287/
https://www.ncbi.nlm.nih.gov/pubmed/31360251
http://dx.doi.org/10.1055/s-0039-1688455
_version_ 1783439282156863488
author Singh, Anup
Irugu, David Victor Kumar
Sikka, Kapil
Verma, Hitesh
Thakar, Alok
author_facet Singh, Anup
Irugu, David Victor Kumar
Sikka, Kapil
Verma, Hitesh
Thakar, Alok
author_sort Singh, Anup
collection PubMed
description Introduction  Sigmoid sinus (SS) variations have been classified variously in the literature. These classifications suffer from some form of shortcoming from a clinical point of view for their application. Objective  We propose a clinically relevant classification of the SS in relation to the posterior semicircular canal (PSCC) and to the exposure of the presigmoid dural plate. The positioning of the SS was analyzed with reference to the volume of the mastoid and to the level of mastoid pneumatization. Methods  A total of 94 formalin-preserved human cadaveric temporal bones were microdissected to carry out a complete mastoidectomy. The SS, the presigmoid dural plate, and the PSCC were exposed, and the position of the former was analyzed in relation to the latter two in order to classify the position of the SS into three grades. Results  Grade I had the best exposure of the presigmoid dura and of the PSCC, while grade III had the poorest exposure of the presigmoid dura and of the PSCC. Grade I SS was associated with good pneumatization and higher mastoid volumes compared with grades II and III. Conclusions  The SS exhibits considerable anatomic variability. A favorable positioning of the SS is associated with a large mastoid volume and pneumatization. A careful preoperative study of the imaging may help in understanding the positioning of the SS and the safety of various transmastoid approaches.
format Online
Article
Text
id pubmed-6660287
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Thieme Publicações Ltda
record_format MEDLINE/PubMed
spelling pubmed-66602872019-07-29 Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study Singh, Anup Irugu, David Victor Kumar Sikka, Kapil Verma, Hitesh Thakar, Alok Int Arch Otorhinolaryngol Introduction  Sigmoid sinus (SS) variations have been classified variously in the literature. These classifications suffer from some form of shortcoming from a clinical point of view for their application. Objective  We propose a clinically relevant classification of the SS in relation to the posterior semicircular canal (PSCC) and to the exposure of the presigmoid dural plate. The positioning of the SS was analyzed with reference to the volume of the mastoid and to the level of mastoid pneumatization. Methods  A total of 94 formalin-preserved human cadaveric temporal bones were microdissected to carry out a complete mastoidectomy. The SS, the presigmoid dural plate, and the PSCC were exposed, and the position of the former was analyzed in relation to the latter two in order to classify the position of the SS into three grades. Results  Grade I had the best exposure of the presigmoid dura and of the PSCC, while grade III had the poorest exposure of the presigmoid dura and of the PSCC. Grade I SS was associated with good pneumatization and higher mastoid volumes compared with grades II and III. Conclusions  The SS exhibits considerable anatomic variability. A favorable positioning of the SS is associated with a large mastoid volume and pneumatization. A careful preoperative study of the imaging may help in understanding the positioning of the SS and the safety of various transmastoid approaches. Thieme Publicações Ltda 2019-07 2019-05-28 /pmc/articles/PMC6660287/ /pubmed/31360251 http://dx.doi.org/10.1055/s-0039-1688455 Text en https://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.
spellingShingle Singh, Anup
Irugu, David Victor Kumar
Sikka, Kapil
Verma, Hitesh
Thakar, Alok
Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study
title Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study
title_full Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study
title_fullStr Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study
title_full_unstemmed Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study
title_short Study of Sigmoid Sinus Variations in the Temporal Bone by Micro Dissection and its Classification – A Cadaveric Study
title_sort study of sigmoid sinus variations in the temporal bone by micro dissection and its classification – a cadaveric study
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6660287/
https://www.ncbi.nlm.nih.gov/pubmed/31360251
http://dx.doi.org/10.1055/s-0039-1688455
work_keys_str_mv AT singhanup studyofsigmoidsinusvariationsinthetemporalbonebymicrodissectionanditsclassificationacadavericstudy
AT irugudavidvictorkumar studyofsigmoidsinusvariationsinthetemporalbonebymicrodissectionanditsclassificationacadavericstudy
AT sikkakapil studyofsigmoidsinusvariationsinthetemporalbonebymicrodissectionanditsclassificationacadavericstudy
AT vermahitesh studyofsigmoidsinusvariationsinthetemporalbonebymicrodissectionanditsclassificationacadavericstudy
AT thakaralok studyofsigmoidsinusvariationsinthetemporalbonebymicrodissectionanditsclassificationacadavericstudy