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  • Gamma Knife Radiosurgery for Management of Peri-optic Meningiomas

    Final Number:

    Hossam Ibrahim Maaty MD

    Study Design:
    Clinical Trial

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2016 Annual Meeting

    Introduction: : Perioptic meningioms pose considerable therapeutic challenges because of their proximity to important cranial nerves, vasculature, and endocrine tissue at the anterior cranial base.

    Methods: : This is a retrospective analysis of a prospectively maintained, institutional data-base in the Cairo Gamma Knife Centre in Nasser Institute. The study material included two hundred thirty three consecutive patients with benign skull base meningiomas in direct contact or displacing the anterior visual pathway treated by single session gamma knife radiosurgery during the period between July 2001 & July 2011 (10 years).

    Results: : Patients were assessed clinically, with neuroimaging and visual field at routine intervals following GKRS. There were (81%) females and (19%) males with an age range (16-80 years). Sixty seven patients (29%) had undergone at least one resection before GKRS, The mean follow-up after GKRS was 47 months (range 23–136 months). At the last follow-up, tumor volumes remained stable or decreased in 94.8% of patients. Actuarial progression-free survival rates at 3, 5, 8, and 10 years were 99%, 94%, 87%, and 62%, respectively. At the last clinical follow-up, 42% of patients demonstrated improvement visual outcome, 52% were stable, and 6% had worse visual outcome. 51% of patients that had pretreatment ocular nerve palsy improved. perifocal brain oedema was the most common complication after treatment (10.7%).

    Conclusions: : Single session GKRS is an effective and minimally invasive option for the treatment of perioptic meningiomas. offering a reasonable rate of tumor control with a considerable rate for tumor shrinkage and a low incidence of complications.

    Patient Care: This work may help neurosurgeons to select the proper technique for each patient with preoptic meningioma

    Learning Objectives: : This retrospective study aims at evaluating gamma knife radiosurgery (GKRS) as a treatment modality for management of benign meningiomas in direct contact with the anterior visual pathway, and assessment of its long term effect over tumor control and visual outcome.


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