Skip to main content
Log in

Intradural en-bloc removal of the anterior clinoid process

  • Neurosurgical Technique
  • Published:
Acta Neurochirurgica Aims and scope Submit manuscript

Summary

Background. Anterior clinoidectomy is useful in the surgical treatment of paraclinoid and parasellar lesions. Previously reported procedures require expertise in drilling, the alternative method reported here reduces the drilling procedure.

Methods and results. En-bloc clinoidectomy is performed intradurally via the standard pterional approach. A 1 to 2 mm-wide narrow drill line is placed with a 1 mm-wide diamond burr through the lesser sphenoid wing. It encircles the medial border of the optic canal and the lateral border of the lesser sphenoid wing over the superior orbital fissure, and is located about 1 cm anterior to the posterior margin of the optic canal. After drilling, one bony piece that includes the anterior clinoid process (ACP) and the optic canal roof remains connected to the basisphenoid bone by the optic strut alone. The optic strut is then fractured easily by applying leverage near its junction with the basisphenoid bone and the piece is removed en bloc with the major part of the optic strut, requiring little or no additional drilling of the residual bony fragments.

Of 37 patients who underwent our en-bloc clinoidectomy, only one suffered complications consisting of cerebrospinal fluid (CSF) leakage through the sphenoid sinus. Our procedure requires an average of 20 min.

Conclusions. Intradural en-bloc removal of the ACP with fracture of the optic strut requires minimal drilling, resulting in decreased risk of injury to the optic nerve and a shortened time for clinoidectomy.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Takahashi, J., Kawarazaki, A. & Hashimoto, N. Intradural en-bloc removal of the anterior clinoid process. Acta Neurochir 146, 505–509 (2004). https://doi.org/10.1007/s00701-004-0249-9

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00701-004-0249-9

Navigation