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Related Experiment Videos

Software-enabled CT analysis of optic nerve position and paranasal sinus pneumatization patterns.

Pete S Batra1, Martin J Citardi, Ryan P Gallivan

  • 1Cleveland Clinic Foundation, Department of Otolaryngology, Section of Nasal and Sinus Disorders, Ohio 44195, USA.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|December 4, 2004
PubMed
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This study classified optic nerve (CN II) pneumatization relative to the sphenoid sinus and sphenoethmoid cells using CT scans. Findings highlight the importance of anatomical awareness during sinonasal surgery to prevent optic nerve injury.

Area of Science:

  • Anatomy
  • Radiology
  • Ophthalmology

Background:

  • The optic nerve (CN II) is closely related to paranasal sinuses.
  • Understanding the anatomical variations of the optic nerve in relation to the sphenoid sinus and sphenoethmoid cell is crucial for surgical safety.

Purpose of the Study:

  • To delineate the anatomical relationships among the optic nerve (CN II), sphenoid sinus, and sphenoethmoid cell.
  • To categorize and quantify pneumatization patterns around the optic nerve.

Main Methods:

  • High-resolution CT scans of 64 human cadavers were analyzed.
  • Pneumatization around the optic nerve was classified into 5 types (0-4).
  • Prevalence of optic nerve positions relative to sphenoid sinus and sphenoethmoid cells was determined.

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Main Results:

  • The prevalence of optic nerve (CN II) positions relative to the sphenoid sinus were: type 0 (4.7%), type 1 (25.8%), type 2 (39.8%), type 3 (14.1%), and type 4 (15.6%).
  • Sphenoethmoid cells were present in 28.1% of cases.
  • The prevalence of optic nerve (CN II) positions relative to the sphenoethmoid cell were: type 0 (5.6%), type 1 (58.3%), type 2 (25%), type 3 (2.8%), and type 4 (8.3%).

Conclusions:

  • Software-enhanced CT review enables precise study of optic nerve (CN II) anatomy.
  • Surgical caution is necessary during sinonasal procedures to avoid inadvertent optic nerve injury.