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01-06-2019 | Original Article

Carotid canal and optic canal at sphenoid sinus

Authors: Neşe Asal, Nuray Bayar Muluk, Mikail Inal, Mehmet Hamdi Şahan, Adil Doğan, Osman Kürşat Arıkan

Published in: Neurosurgical Review | Issue 2/2019

Abstract

In the present study, we investigated the relationship between sphenoid sinus, carotid canal, and optic canal on paranasal sinus computed tomography (PNSCT). This study was performed retrospectively. PNSCT images of 300 adult subjects (159 male, 141 female). Sphenoid sinus (pneumatisation, dominancy, septation, inter-sinus septa deviation), anterior clinoid process pneumatisation, Onodi cell, carotid and optic canals (width, dehiscence, classification) were measured. In males, type 3 pneumatised sphenoid sinus (in both sides) and in females type 2 pneumatised sphenoid sinus (right side) and type 3 pneumatised sphenoid sinus (left side) were detected more. Anterior clinoid pneumatisation was present 47.2% in males and 39.7% in females. In male group, more septation (i.e. 22.6%, ≥ 3 septa) in sphenoid sinus were detected. Onodi cell was present 26.6 and 19.1% in males and females, respectively. Carotid canal protrudation to the sphenoid sinus wall was present 23.9–32.1% in males and 35.5–36.2% in females. Dehiscence in carotid canal was detected more in females (34%) compared to males (22%). Optic canal protrudation was 33.3 and 30.5% in males and females. Type 4 optic canal was detected more in both gender. Optic canal dehiscence was detected 11.3 and 9.9% in males and females. Carotid and optic canal diameters were higher in males. In pneumatised sphenoid sinuses and in females, type 3 carotid canal (Protrudation to SS wall) (bilaterally) and type 1 optic canal type (No indentation) (ipsilateral side) were detected more. In elderly patients, carotid and optic canal width increased. When carotid canal protrudation was detected, there was no indentation in optic canals In pneumatised SS, carotid canal protrudation was observed with a greater risk in surgery. However, type 1 (non indentation) optic canal was present in highly pneumatised SS with lower risk for the surgery. In women, the risk of carotid canal protruding (about 1/3) is greater than that of males, and carotid canal dehiscence rates are also higher in females. Therefore, physicians should be very careful during the preparatory stages of the sphenoid sinus surgery. Otherwise, it may not be possible to prevent lethal carotid artery bleeds.

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Title: Carotid canal and optic canal at sphenoid sinus
Authors: Neşe Asal
Nuray Bayar Muluk
Mikail Inal
Mehmet Hamdi Şahan
Adil Doğan
Osman Kürşat Arıkan
Publication date: 01-06-2019
Publisher: Springer Berlin Heidelberg
Published in: Neurosurgical Review / Issue 2/2019
Print ISSN: 0344-5607
Electronic ISSN: 1437-2320
DOI: https://doi.org/10.1007/s10143-018-0995-4

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Carotid canal and optic canal at sphenoid sinus

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