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Background <p>The endoscopic transorbital approach (ETOA) is being established as a new corridor for the lateral portion of the anterior and middle skull base. One of the main concerns is the risk of ophthalmological complications due to orbital retraction. Removal of the lateral orbital rim (LOR) is a simple measure that widens the corridor and may diminish injuries secondary to retraction. This study analyzes the impact of LOR removal on intraorbital pressure (IORP) during the stages of ETOA.</p> Methods <p>In this prospective cadaveric study, standard ETOA to the anterior and middle fossae were performed via a superior eyelid crease incision (Fig.&#xa0;<InternalRef RefID="Fig2">2</InternalRef>). On one side, the LOR was preserved; on the other, it was removed. IORP was recorded with an intracranial pressure (ICP) probe during the entirety procedure (Fig.&#xa0;<InternalRef RefID="Fig3">3</InternalRef>). All specimens underwent pre- and post-procedure CT to measure bone removal volume.</p> Results <p>Four specimens were used (8 sides, 4 with LOR removal, 4 without). Mean IORP was not statistically different between groups during periorbita detachment, which was prior to LOR removal (117.4 vs 91.5 mmHg, for the LOR removal group and LOR intact group respectively <i>p</i> = 0.217). IORP was consistently reduced in the LOR removal group in every subsequent step (Fig.&#xa0;<InternalRef RefID="Fig3">3</InternalRef>): meningo-orbital band cutting (105.5 to 38.9 mmHg,<i> p</i> &lt; 0.002), temporal fossa drilling (85.3 to 69.5 mmHg, <i>p </i>= 0.232), lateral greater sphenoid wing (GSW) drilling (99.8 to 49.9 mmHg, <i>p </i>&lt; 0.001), medial GSW drilling (85.6 to 17.2 mmHg, <i>p</i> &lt; 0.001), cavernous sinus peeling (85.6 to 3.0 mmHg, <i>p </i>&lt; 0.001). LOR removal increased total bone removal volume from 6.2 cc to 9.4 cc (<i>p</i> = 0.05).</p> Conclusion <p>LOR removal decreased IORP, especially when working on the GSW and cavernous sinus, and significantly increased bone removal. These results support LOR removal to reduce orbital retraction stress and widen the working corridor during ETOA.</p>

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Impact of removal of the lateral orbital rim on intraorbital pressure during endoscopic trans-orbital approach (ETOA): a cadaveric study

  • 期刊论文

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  • 发表日期：

    2025年12月20日

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  • Antonio Strangio,
  • Joel Davaine Ndongo Sonfack,
  • Marc-Olivier Comeau,
  • Guilherme Gago,
  • Annie Moreau,
  • Martìn Coté,
  • Pierre-Olivier Champagne

摘要

Background

The endoscopic transorbital approach (ETOA) is being established as a new corridor for the lateral portion of the anterior and middle skull base. One of the main concerns is the risk of ophthalmological complications due to orbital retraction. Removal of the lateral orbital rim (LOR) is a simple measure that widens the corridor and may diminish injuries secondary to retraction. This study analyzes the impact of LOR removal on intraorbital pressure (IORP) during the stages of ETOA.

Methods

In this prospective cadaveric study, standard ETOA to the anterior and middle fossae were performed via a superior eyelid crease incision (Fig. 2). On one side, the LOR was preserved; on the other, it was removed. IORP was recorded with an intracranial pressure (ICP) probe during the entirety procedure (Fig. 3). All specimens underwent pre- and post-procedure CT to measure bone removal volume.

Results

Four specimens were used (8 sides, 4 with LOR removal, 4 without). Mean IORP was not statistically different between groups during periorbita detachment, which was prior to LOR removal (117.4 vs 91.5 mmHg, for the LOR removal group and LOR intact group respectively p = 0.217). IORP was consistently reduced in the LOR removal group in every subsequent step (Fig. 3): meningo-orbital band cutting (105.5 to 38.9 mmHg, p < 0.002), temporal fossa drilling (85.3 to 69.5 mmHg, p = 0.232), lateral greater sphenoid wing (GSW) drilling (99.8 to 49.9 mmHg, p < 0.001), medial GSW drilling (85.6 to 17.2 mmHg, p < 0.001), cavernous sinus peeling (85.6 to 3.0 mmHg, p < 0.001). LOR removal increased total bone removal volume from 6.2 cc to 9.4 cc (p = 0.05).

Conclusion

LOR removal decreased IORP, especially when working on the GSW and cavernous sinus, and significantly increased bone removal. These results support LOR removal to reduce orbital retraction stress and widen the working corridor during ETOA.