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
Summary
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.
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.
