Evaluation of variations of optic nerve course in relation to posterior paranasal sinuses in MDCT in a tertiary care center of Nepal: a retrospective cross-section study.

Autor:	Dahal P; Department of Radiology and Imaging, Grande International Hospital., Parajuli S; Department of Pathology, Bir Hospital, Kathmandu, Nepal., Pradhan P; Department of Radiology and Imaging, Grande International Hospital., Maharjan S; Department of Radiology and Imaging, Grande International Hospital., Adhikari G; Department of Radiology and Imaging, Grande International Hospital., Tamang OY; Department of Radiology and Imaging, Grande International Hospital., Upadhyaya RP; Department of Radiology and Imaging, Grande International Hospital., Dawadi K; Department of Radiology and Imaging, Grande International Hospital., Shrestha A; Department of Radiology and Imaging, Grande International Hospital.
Jazyk:	angličtina
Zdroj:	Annals of medicine and surgery (2012) [Ann Med Surg (Lond)] 2024 Jan 04; Vol. 86 (3), pp. 1309-1314. Date of Electronic Publication: 2024 Jan 04 (Print Publication: 2024).
DOI:	10.1097/MS9.0000000000001697
Abstrakt:	Background: The proximity of optic nerves to the posterior paranasal sinuses (PNS) is a critical consideration in preventing optic nerve injuries during functional endoscopic sinus surgery. Methods: A retrospective cross-sectional study was conducted on 367 patients aged 13 years and above. Four radiologists, each with 2-6 years of experience, evaluated computed tomography scans of the PNS and the head of these patients. The optic nerves were classified into four types based on DeLano's classification, and their respective prevalence rates were determined. Additionally, the prevalence of optic nerve dehiscence and pneumatization of the anterior clinoid process was assessed. Results: A total of 734 optic nerves were evaluated and categorized into four groups as per DeLano's classification. The most common type was classified as type 1 optic nerve, representing 65.4% of all optic nerves. Types 2, 3, and 4 optic nerves accounted for 16.9, 8.6, and 9.1%, respectively. The prevalence rates of type 1, type 2, type 3, and type 4 optic nerves were 76.6, 24.5, 12.3, and 14.4%, respectively. Optic nerve dehiscence was observed in 14.3% of cases, with a prevalence of 21.2% in the study. Type 3 optic nerves were most commonly associated with dehiscence, with 49.2% of them showing dehiscence in their course through the ethmoid or sphenoid sinus. The prevalence of pneumatization of the anterior clinoid process in the study population was 28.3%, with type 3 optic nerves being the most frequently associated. Conclusion: An understanding of the relationship between optic nerves and posterior PNS, as well as awareness of optic nerve dehiscence, is essential in preventing injuries during sinus surgeries. Type 1 optic nerve predominates among Nepalese patients visiting our hospital. Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. (Copyright © 2024 The Author(s). Published by Wolters Kluwer Health, Inc.)
Databáze:	MEDLINE
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