INTRODUCTION: The clinical management of parasellar meningiomas (PM) is challenging due to their intimate association with critical neurovascular structures. Consensus regarding the recommended treatment protocol is lacking. This study will evaluate patients' visual outcomes following endoscopic transnasal optic nerve decompression (ETOND) and will investigate the possibility of reducing the rate of complications associated with stereotactic radiosurgery (SRS). METHODS: Retrospective analysis was conducted on all patients who underwent ETOND for PM between 2013 and 2020. The study comprised 12 patients (7 women and 5 men aged 36-75 years; mean, 55.2 years; median, 57.6 years) in which 14 optic nerve decompression procedures were carried out. Patients were followed up for 6 to 86 months (mean, 29.3 months; median, 25 months). There were five cases of spheno-orbital meningioma, four cases of cavernous sinus meningioma, and one case each of petro-clival meningioma, optic nerve sheath meningioma, and planum sphenoidale/tuberculum sellae meningioma. Visual outcome was evaluated and any postoperative complications noted. RESULTS: Improvements in visual acuity were noted in 10 of 14 eyes (71.4%) 3 to 6 months postoperation. Visual acuity remained stable in the remaining four eyes. No deterioration of visual acuity was noted during the follow-up period. In total, 9 of the 12 patients underwent SRS. No tumor growth was determined, while reduction in tumor volume was noted in five patients following SRS. No complications associated with SRS or the surgical procedure were noted. CONCLUSIONS: ETOND appears to be a promising technique for increasing rates of improved visual function, while reducing the risk of post SRS-related complications. In combination with subsequent SRS, it is an ideal treatment modality in the management of parasellar meningiomas. Confirmation of our findings would require a larger, prospective multicenter study.

Department of Neurosurgery University Hospital Ostrava 70852 Ostrava Czech Republic

Department of Oncology University Hospital Ostrava 70852 Ostrava Czech Republic

Department of Otorhinolaryngology Head and Neck Surgery University Hospital Ostrava 70852 Ostrava Czech Republic

Faculty of Medicine University of Ostrava 70300 Ostrava Czech Republic

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$a Matoušek, Petr $u Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Ostrava, 70852 Ostrava, Czech Republic $u Faculty of Medicine, University of Ostrava, 70300 Ostrava, Czech Republic $1 https://orcid.org/0000000209306773

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$a Does Endoscopic Transnasal Optic Nerve Decompression Followed by Radiosurgery Improve Outcomes in the Treatment of Parasellar Meningiomas / $c P. Matoušek, J. Cvek, L. Čábalová, E. Misiorzová, O. Krejčí, R. Lipina, T. Krejčí

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$a INTRODUCTION: The clinical management of parasellar meningiomas (PM) is challenging due to their intimate association with critical neurovascular structures. Consensus regarding the recommended treatment protocol is lacking. This study will evaluate patients' visual outcomes following endoscopic transnasal optic nerve decompression (ETOND) and will investigate the possibility of reducing the rate of complications associated with stereotactic radiosurgery (SRS). METHODS: Retrospective analysis was conducted on all patients who underwent ETOND for PM between 2013 and 2020. The study comprised 12 patients (7 women and 5 men aged 36-75 years; mean, 55.2 years; median, 57.6 years) in which 14 optic nerve decompression procedures were carried out. Patients were followed up for 6 to 86 months (mean, 29.3 months; median, 25 months). There were five cases of spheno-orbital meningioma, four cases of cavernous sinus meningioma, and one case each of petro-clival meningioma, optic nerve sheath meningioma, and planum sphenoidale/tuberculum sellae meningioma. Visual outcome was evaluated and any postoperative complications noted. RESULTS: Improvements in visual acuity were noted in 10 of 14 eyes (71.4%) 3 to 6 months postoperation. Visual acuity remained stable in the remaining four eyes. No deterioration of visual acuity was noted during the follow-up period. In total, 9 of the 12 patients underwent SRS. No tumor growth was determined, while reduction in tumor volume was noted in five patients following SRS. No complications associated with SRS or the surgical procedure were noted. CONCLUSIONS: ETOND appears to be a promising technique for increasing rates of improved visual function, while reducing the risk of post SRS-related complications. In combination with subsequent SRS, it is an ideal treatment modality in the management of parasellar meningiomas. Confirmation of our findings would require a larger, prospective multicenter study.

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$a Cvek, Jakub $u Faculty of Medicine, University of Ostrava, 70300 Ostrava, Czech Republic $u Department of Oncology, University Hospital Ostrava, 70852 Ostrava, Czech Republic

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$a Čábalová, Lenka $u Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Ostrava, 70852 Ostrava, Czech Republic $u Faculty of Medicine, University of Ostrava, 70300 Ostrava, Czech Republic $1 https://orcid.org/000000022117040X

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$a Misiorzová, Eva $u Faculty of Medicine, University of Ostrava, 70300 Ostrava, Czech Republic $u Department of Neurosurgery, University Hospital Ostrava, 70852 Ostrava, Czech Republic

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$a Krejčí, Ondřej $u Department of Neurosurgery, University Hospital Ostrava, 70852 Ostrava, Czech Republic

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$a Lipina, Radim $u Faculty of Medicine, University of Ostrava, 70300 Ostrava, Czech Republic $u Department of Neurosurgery, University Hospital Ostrava, 70852 Ostrava, Czech Republic

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$a Krejčí, Tomáš $u Faculty of Medicine, University of Ostrava, 70300 Ostrava, Czech Republic $u Department of Neurosurgery, University Hospital Ostrava, 70852 Ostrava, Czech Republic $1 https://orcid.org/0000000169962679

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