Abstract
Treatment indication for unruptured arteriovenous malformations (AVMs) of the brain was investigated based on long-term results of low-dose Gamma Knife (GK) surgery. Thirty-nine patients with unruptured AVMs treated with GK surgery were followed more than 7 years. These AVMs were found due to seizure and steal symptoms in 22 and 4 patients, respectively, and incidentally in 13. Embolization was performed in 6 patients before GK surgery. Total obliteration was obtained in 83.3% after initial treatment and 95.8% after additional treatment. Bleeding before total obliteration occurred in 2 patients and adverse effect on the internal capsule in 1. It is concluded that low-dose GK surgery is safe and effective for the treatment of unruptured AVMs, especially symptomatic AVMs in functional areas.
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