Transorbital Microsurgery: An Anatomical Description of a Minimally Invasive Corridor to the Anterior Cranial Fossa and Paramedian Structures

Lena Mary Houlihan; Thanapong Loymak; Irakliy Abramov; Mohamed A. Labib; Michael G. J. O'Sullivan; Michael T. Lawton; Mark C. Preul

doi:10.1055/s-0043-1772202

Journal of Neurological Surgery Part B: Skull Base, Inhaltsverzeichnis

J Neurol Surg B Skull Base 2024; 85(05): 470-480
DOI: 10.1055/s-0043-1772202

Original Article

Transorbital Microsurgery: An Anatomical Description of a Minimally Invasive Corridor to the Anterior Cranial Fossa and Paramedian Structures

Lena Mary Houlihan

¹Department of Neurosurgery, The Loyal and Edith Davis Neurosurgical Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States

,

Thanapong Loymak

¹Department of Neurosurgery, The Loyal and Edith Davis Neurosurgical Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States

,

Irakliy Abramov

¹Department of Neurosurgery, The Loyal and Edith Davis Neurosurgical Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States

,

Mohamed A. Labib

¹Department of Neurosurgery, The Loyal and Edith Davis Neurosurgical Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States

,

Michael G. J. O'Sullivan

²Department of Neurosurgery, Cork University Hospital, Wilton, Cork, Ireland

,

Michael T. Lawton

¹Department of Neurosurgery, The Loyal and Edith Davis Neurosurgical Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States

,

Mark C. Preul

¹Department of Neurosurgery, The Loyal and Edith Davis Neurosurgical Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States

› Institutsangaben

Abstract

Objectives Transorbital neuroendoscopic surgery (TONES) has ignited interest in the transorbital access corridor, increasing its use for single and multi-portal skull base interventions. However, the crowding of a small corridor and two-dimensional viewing restrict this access portal.

Design Cadaveric qualitative study to assess the feasibility of transorbital microsurgery (TMS).

Setting Anatomical dissection steps and instrumentation were recorded for homogeneous methodology.

Participants Six cadaveric specimens were systematically dissected using TMS to the anterior cranial fossa and paramedian structures.

Main Outcome Measures Anatomical parameters of the TMS craniectomy were established, and the visible and accessible neuroanatomy was highlighted.

Results A superior lid crease incision achieved essential orbital rim exposure and preseptal dissection. The orbital roof craniectomy is defined by three boundaries: (1) frontozygomatic suture to the frontosphenoid suture, (2) frontal sinus and cribriform plate, and (3) frontal sinus and orbital rim. The mean (standard deviation) craniectomy was 440 mm² (78 mm²). Exposing the ipsilateral optic nerve and internal carotid artery obviated the need for frontal lobe retraction to identify the A1–M1 bifurcation as well as near-complete visualization of the M1 artery.

Conclusion TMS is a feasible corridor for intracranial access. Mobilization of orbital contents is imperative for maximal intracranial access and protection of the globe. TMS enables access to the frontal lobe base, ipsilateral optic nerve, and most of the ipsilateral anterior circulation. This cosmetically satisfactory approach causes minimal destruction of the anterior skull base with satisfactory exposure of the anterior cranial fossa floor without sinus invasion.

Keywords

anterior cranial fossa - microsurgery - paramedian structures - transorbital approach

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Referenzen

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