• Paulo M Mesquita Filho, Daniel M Prevedello, Luciano M Prevedello, Leo F Ditzel Filho, Mariano E Fiore, Ricardo L Dolci, Lamia Buohliqah, Bradley A Otto, and Ricardo L Carrau.
• Department of Neurosurgery, Passo Fundo City Hospital, Rio Grande do Sul, Brazil; Department of Neurological Surgery, Ohio State University Wexner Medical Center, Columbus, Ohio, USA. Electronic address: pmesquitafilho@hotmail.com.
• World Neurosurg. 2017 Aug 1; 104: 745-751.

BackgroundThe optic canal is a bony channel that connects the anterior cranial fossa and orbit and contains the optic nerve and ophthalmic artery. It can be affected by several pathologies, leading to compression of the nerve nearby or inside the canal, leading to visual impairment. The usual technique to decompress the canal is through a craniotomy, but recently endoscopic endonasal approaches (EEAs) have surfaced as an interesting alternative due to direct access to the canal without the need for manipulation of neurovascular structures.MethodsSix specimens were dissected. The right optic canal was drilled on the right side via the EEA, and the left optic canal was drilled via frontotemporal craniotomy. The amount of decompression was measured using a 3-dimensional reconstruction on computed tomography scans and compared.ResultsThe EEA generated an average of 267.8 (221-294) degrees of decompression in the anterior portion of the canal versus 258.3 (219-300) degrees of decompression in the posterior portion of the canal, whereas the craniotomy generated an average of 229.3 (101-289) degrees of decompression in the anterior portion of the canal versus 250.3 (76-300) degrees of decompression in the posterior portion of the canal. There was no significant difference statistically.ConclusionThe decision for an approach for optic canal decompression should be based on the site of the pathology and localization of canal involvement. Both techniques are equivalent in terms of proportion of nerve decompression.Copyright © 2017 Elsevier Inc. All rights reserved.

28 keywords...

hide…