Multisession Gamma Knife surgery for benign orbital tumors Clinical article

ArticleinJournal of Neurosurgery 117:102-107 · December 2012with2 Reads
Impact Factor: 3.74 · DOI: 10.3171/2012.7.GKS12780

    Abstract

    Object:
    The goal of this study was to investigate the safety and efficacy of multisession Gamma Knife surgery (GKS) in the treatment of benign orbital tumors.

    Methods:
    Twenty-three patients who retained their vision despite having tumors touching their optic nerve were treated with multisession (4-fraction) GKS. The median tumor volume was 2800 mm(3) (range 211-10,800 mm(3)), and the median cumulative margin dose was 20 Gy (range 18-22 Gy).

    Results:
    The median clinical follow-up duration in these patients was 38 months (range 9-74 months). No patient experienced tumor progression in this study. In particular, a higher degree of tumor shrinkage was found in the 7 patients with cavernous hemangiomas than in patients with other types of lesions (p < 0.05). Of the 23 patients whose preoperative vision was preserved, 11 showed improvement in visual acuity and/or visual field and 12 showed stable visual acuity. No GKS-related adverse events were noted during or after treatment.

    Conclusions:
    Multisession radiosurgery using the Gamma Knife may be a good strategy for tumors in direct contact with the optic nerve. A cumulative margin dose of up to 22 Gy delivered in 4 sessions is safe for preservation of visual function with a high probability of tumor control.