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A 35-year-old female patient with left intraorbital schwannoma underwent multisession gamma knife radiosurgery (GKRS) (20 Gy in 4 fractions). Magnetic resonance images before (A) and 10 months after GKRS (B) show decrease in tumor size. Visual acuity improved from 0.1 to 1.0. Visual field examination shows large field defect before treatment (C) and only a small blind spot 10 months after treatment (D).
