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Endoscopic Endonasal Transclival Transcondylar Approach for Foramen Magnum Meningiomas: Surgical Anatomy and

Wei-Hsin Wang1,2,3, Kumar Abhinav1, Eric Wang1,4

  • 1Department of Neurological Surgery, University of Pittsburgh School of Medicine, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania.

Operative Neurosurgery (Hagerstown, Md.)
|March 6, 2018
PubMed
Abstract

Insights

Endoscopic endonasal surgery can improve access to foramen magnum (FM) lesions. Minimal resection of the occipital condyle and C1 arch expands the surgical corridor, enhancing safety and efficacy for FM tumor removal.

Area of Science:

  • Neurosurgery
  • Skull Base Surgery
  • Endoscopic Surgery

Background:

  • Ventral foramen magnum (FM) lesions are challenging to access surgically.
  • The endoscopic endonasal approach offers a direct route but is limited by surrounding bony structures.
  • Resection of the occipital condyles and C1 arch may be necessary to expand the surgical corridor.

Purpose of the Study:

  • To investigate anatomical landmarks and techniques for expanding the endonasal surgical corridor at the FM.
  • To quantify the extent of medial occipital condyle resection required for lateral FM exposure.
  • To assess methods for inferior corridor expansion by drilling the C1 anterior arch and odontoid process.

Main Methods:

  • Endoscopic endonasal inferior transclival and transcondylar approaches were performed on five human cadaveric specimens.
  • Medial occipital condyle resection was guided by anatomical landmarks and limited posteriorly by the hypoglossal canal.
  • CT-volumetric analysis quantified the resected condyle volume (mean 18% unilateral resection).
  • Inferior corridor expansion involved drilling the superior C1 anterior arch and odontoid tip.

Main Results:

  • Unilateral medial occipital condyle resection averaged 18% of the total volume.
  • The surgical corridor was successfully extended inferiorly in all specimens without compromising the transverse ligament.
  • These techniques were validated in clinical application.

Conclusions:

  • Anatomical landmarks provide reliable guidance for endonasal anteromedial occipital condyle resection.
  • Limited condyle resection effectively widens lateral FM access, minimizing risks of craniocervical instability.
  • Endoscopic endonasal techniques allow safe and effective corridor expansion for treating FM lesions.

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