Relationship Between the Cochlear Aqueduct and Internal Auditory Canal: Surgical Implications for Transcanal Transpromontorial Approaches to the Lateral Skull Base.

Molinari, Giulia; Yacoub, Abraam; Bonali, Marco; Wimmer, Wilhelm; Alicandri-Ciufelli, Matteo; Caversaccio, Marco; Presutti, Livio; Anschuetz, Lukas (2021). Relationship Between the Cochlear Aqueduct and Internal Auditory Canal: Surgical Implications for Transcanal Transpromontorial Approaches to the Lateral Skull Base. Otology & neurotology, 42(2), e227-e232. Wolters Kluwer 10.1097/MAO.0000000000002909

[img] Text
Relationship_Between_the_Cochlear_Aqueduct_and.95905.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (2MB) | Request a copy

HYPOTHESIS

The cochlear aqueduct (CA) is subject to considerable anatomical variability. We hypothesize a topographical relationship between the CA and the internal auditory canal (IAC).

BACKGROUND

The CA represents the lower limit of dissection during transcanal transpromontorial approaches to the lateral skull base due to its close relationship to the lower cranial nerves and jugular vein.

METHODS

Three-dimensional models from high-resolution computed tomography scans of normal human temporal bones were created using threshold-based segmentation. The CA was classified into four categories. Five points were determined on the three-dimensional models to measure the surgically relevant relationships.

RESULTS

Segmentation was performed on 26 high-resolution computed tomography scans. The average length of the virtual and visual part of the CA was 6.6 mm (SD ±1.7 mm) and 5.5 mm (SD ±1.3 mm) respectively. The mean distance between the IAC and the medial end of the visual part of the CA was 3.8 mm (±0.7 mm), while the average distance between the IAC and the lateral end was 1.4 mm (±0.6 mm). The distance between the visual part of the CA and the IAC increased by 0.25 mm per from the fundus of the IAC.

CONCLUSION

A close relationship between the CA and the IAC could be established, despite the anatomical variability of the CA. The distance between CA and IAC increases by 0.25 per mm from the fundus to the porus of the IAC. These findings quantify the inferior limit of dissection of the transcanal transpromontorial approach to the lateral skull base.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Ear, Nose and Throat Disorders (ENT)
10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Hearing Research Laboratory

UniBE Contributor:

Molinari, Giulia; Yacoub, Abraam; Wimmer, Wilhelm; Caversaccio, Marco and Anschütz, Lukas Peter

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1537-4505

Publisher:

Wolters Kluwer

Language:

English

Submitter:

Wilhelm Wimmer

Date Deposited:

22 Dec 2020 08:49

Last Modified:

15 Jan 2021 01:33

Publisher DOI:

10.1097/MAO.0000000000002909

PubMed ID:

33273312

BORIS DOI:

10.7892/boris.149096

URI:

https://boris.unibe.ch/id/eprint/149096

Actions (login required)

Edit item Edit item
Provide Feedback