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Endoscopic Transnasal Approach for Deep Lateral Orbital Decompression: A Cadaver Study.

Teppei Takeda1,2, Yasine Mirmozaffari2, Asha Nadabar2

  • 1Department of Otorhinolaryngology, The Jikei University School of Medicine, Tokyo, Japan.

Journal of Neurological Surgery. Part B, Skull Base
|March 11, 2026
PubMed
Summary
This summary is machine-generated.

This cadaver study shows an endoscopic transnasal approach significantly reduces sphenoid trigone volume for orbital decompression. This method offers a promising alternative for surgical interventions.

Keywords:
cadaver studyendoscopic transnasal approachexophthalmosorbital decompressionorbital surgerysphenoid trigone

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Area of Science:

  • Anatomy
  • Surgical Techniques
  • Ophthalmology

Background:

  • Deep lateral orbital decompression is crucial for managing various orbital conditions.
  • Traditional surgical approaches may have limitations in accessing deep orbital structures.
  • Endoscopic techniques offer minimally invasive alternatives for complex anatomical regions.

Purpose of the Study:

  • To evaluate the anatomical feasibility of an endoscopic transnasal approach for deep lateral orbital decompression.
  • To assess the efficacy of this approach in reducing the dimensions of the sphenoid trigone.

Main Methods:

  • A cadaver study utilizing four fresh frozen cadaver heads (eight sides).
  • Endoscopic transnasal approach performed for deep lateral orbital decompression.
  • CT scans used to measure sphenoid trigone dimensions (width, height, depth, volume) pre- and post-operatively.

Main Results:

  • Significant reduction in sphenoid trigone volume (53.9%) achieved.
  • Marked decreases in trigone height (65.0%), width (84.3%), and depth (76.8%).
  • Mild limitations noted in cephalocaudal axis reduction, with residual regions remaining.

Conclusions:

  • The endoscopic transnasal approach is anatomically feasible and effective for reducing sphenoid trigone size.
  • This technique presents a promising alternative for orbital decompression with potential clinical applications.
  • Further research is warranted to explore long-term outcomes and surgical integration.