Marcos Chiarullo1, Jorge Mura2, Pablo Rubino3, Nícollas Nunes Rabelo4, Rafael Martinez-Perez5, Eberval Gadelha Figueiredo6, Albert Rhoton7. 1. Department of Neurosurgery, University of Florida, College of Medicine, Gainesville, Florida, USA; Department of Neurosurgery, El Cruce Hospital, Florencio Varela, Buenos Aires, Argentina. 2. Cerebrovascular and Skull Base Department, Institute of Neurosurgery, Asenjo, Providencia, Santiago, Chile; Department of Neurological Sciences, University of Chile, Santiago, Chile. 3. Department of Neurosurgery, El Cruce Hospital, Florencio Varela, Buenos Aires, Argentina. 4. Department of Neurosurgery, University of São Paulo, São Paulo, Brazil. 5. Department of Neurological Surgery, Wexner Medical Center, The Ohio State University-Columbus, Columbus, Ohio, USA. 6. Department of Neurosurgery, University of São Paulo, São Paulo, Brazil. Electronic address: ebgadelha@yahoo.com. 7. Department of Neurosurgery, University of Florida, College of Medicine, Gainesville, Florida, USA.
Abstract
BACKGROUND: Several diseases that involve the optic canal or its contained structures may cause visual impairment. Several techniques have been developed to decompress the optic nerve. OBJECTIVE: To describe minimally invasive extradural anterior clinoidectomy (MiniEx) for optic nerve decompression, detail its surgical anatomy, present clinical cases, and established a proof of concept. METHODS: Anatomic dissections were performed in cadaver heads to show the surgical anatomy and to show stepwise the MiniEx approach. In addition, these surgical concepts were applied to decompress the optic nerve in 6 clinical cases. RESULTS: The MiniEx approach allowed the extradural anterior clinoidectomy and a nearly 270° optic nerve decompression using the no-drill technique. In the MiniEx approach, the skin incision, dissection of the temporal muscle, and craniotomy were smaller and provided the same extent of exposure of the optic nerve, anterior clinoid process, and superior orbital fissure as that usually provided by standard techniques. All patients who underwent operation with this technique had improved visual status. CONCLUSIONS: The MiniEx approach is an excellent alternative to traditional approaches for extradural anterior clinoidectomy and optic nerve decompression. It may be used as a part of more complex surgery or as a single surgical procedure.
BACKGROUND: Several diseases that involve the optic canal or its contained structures may cause visual impairment. Several techniques have been developed to decompress the optic nerve. OBJECTIVE: To describe minimally invasive extradural anterior clinoidectomy (MiniEx) for optic nerve decompression, detail its surgical anatomy, present clinical cases, and established a proof of concept. METHODS: Anatomic dissections were performed in cadaver heads to show the surgical anatomy and to show stepwise the MiniEx approach. In addition, these surgical concepts were applied to decompress the optic nerve in 6 clinical cases. RESULTS: The MiniEx approach allowed the extradural anterior clinoidectomy and a nearly 270° optic nerve decompression using the no-drill technique. In the MiniEx approach, the skin incision, dissection of the temporal muscle, and craniotomy were smaller and provided the same extent of exposure of the optic nerve, anterior clinoid process, and superior orbital fissure as that usually provided by standard techniques. All patients who underwent operation with this technique had improved visual status. CONCLUSIONS: The MiniEx approach is an excellent alternative to traditional approaches for extradural anterior clinoidectomy and optic nerve decompression. It may be used as a part of more complex surgery or as a single surgical procedure.
Authors: Jun Kim; Aaron R Plitt; Awais Vance; Scott Connors; James Caruso; Babu Welch; Tomas Garzon-Muvdi Journal: J Neurol Surg B Skull Base Date: 2021-05-29
Authors: Rafael Martinez-Perez; Holger Joswig; Asterios Tsimpas; Tomas Poblete; Pablo Albiña; Ivan Perales; Jorge M Mura Journal: Neurosurg Rev Date: 2019-12-09 Impact factor: 3.042