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Endoscopic transorbital approach to anterolateral skull base through inferior orbital fissure: a cadaveric study

  • Original Article - Neurosurgical Anatomy
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Abstract

Background

Endoscopic transorbital approach (eTOA) has been announced as an alternative minimally invasive surgery to skull base. Owing to the inferior orbital fissure (IOF) connecting the orbit with surrounding pterygopalatine fossa (PPF), infratemporal fossa (ITF), and temporal fossa, the idea of eTOA to anterolateral skull base through IOF is postulated. The aim of this study is to access its practical feasibility.

Methods

Anatomical dissections were performed in five human cadaveric heads (10 sides) using 0-degree and 30-degree endoscopes. A stepwise description of eTOA to anterolateral skull base through IOF was documented. The anterosuperior corner of the maxillary sinus in the horizontal plane of the upper edge of zygomatic arch was defined as reference point (RP). The distances between the RP to the foramen rotundum (FR), foramen ovale (FO), and Gasserian ganglion (GG) were measured. The exposed area of anterolateral skull base in the coronal plane of the posterior wall of the maxillary sinus was quantified.

Results

The surgical procedure consisted of six steps: (1) lateral canthotomy with cantholysis and preseptal lower eyelid approach with periorbita dissection; (2) drilling of the ocular surface of greater sphenoid wing and lateral orbital rim osteotomy; (3) entry into the maxillary sinus and exposure of PPF and ITF; (4) mobilization of infraorbital nerve with drilling of the infratemporal surface of the greater sphenoid wing and pterygoid process; (5) exposure of middle cranial fossa, Meckel’s cave, and lateral wall of cavernous sinus; and (6) reconstruction of orbital floor and lateral orbital rim. The distances measured were as follows: RP-FR = 45.0 ± 1.9 mm, RP-FO = 55.7 ± 0.5 mm, and RP-GG = 61.0 ± 1.6 mm. In comparison with the horizontal portion of greater sphenoid wing, the superior and inferior axes of the exposed area were 22.3 ± 2.1 mm and 20.5 ± 1.8 mm, respectively. With reference to the FR, the medial and lateral axes of the exposed area were 11.6 ± 1.1 mm and 15.8 ± 1.6 mm, respectively.

Conclusions

The eTOA through IOF can be used as a minimally invasive surgery to access whole anterolateral skull base. It provides a possible resolution to target lesion involving multiple compartments of anterolateral skull base.

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Funding

This work was supported by the Tri-Service General Hospital of Taiwan’s Medical Research Project (TSGH-C104-078 and TSGH-C107-071).

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Authors and Affiliations

  1. Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, No. 325, Section 2, Cheng-Kung Road, Neihu, 114, Taipei, Taiwan, Republic of China

    Bon-Jour Lin, Da-Tong Ju, Tzu-Hsien Hsu, Tzu-Tsao Chung, Wei-Hsiu Liu, Dueng-Yuan Hueng, Yuan-Hao Chen, Chung-Ching Hsia, Hsin-I Ma, Ming-Ying Liu & Chi-Tun Tang

  2. Department of Surgery, Nantou Hospital, Nantou, Taiwan, Republic of China

    Bon-Jour Lin

  3. Department of Surgery, Taichung Armed Forces General Hospital, Taichung, Taiwan, Republic of China

    Tzu-Hsien Hsu

  4. Department of Internal Medicine, Nantou Hospital, Nantou, Taiwan, Republic of China

    Hung-Chang Hung

  5. Department of Healthcare Administration, Central Taiwan University of Science and Technology, Taichung, Taiwan, Republic of China

    Hung-Chang Hung

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  1. Bon-Jour Lin
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Correspondence to Chi-Tun Tang.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Lin, BJ., Ju, DT., Hsu, TH. et al. Endoscopic transorbital approach to anterolateral skull base through inferior orbital fissure: a cadaveric study. Acta Neurochir 161, 1919–1929 (2019). https://doi.org/10.1007/s00701-019-03993-3

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