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聴神経腫瘍は,組織学的には良性の腫瘍であり,疾患特異的死亡率も極めて低い腫瘍である。初発症状としては聴力障害が最も多く,ふらつきやめまいなどの前庭神経症状や顔面神経麻痺も生じる場合がある1)2)。一般的に,外科的手術・放射線治療・経過観察のいずれかが行われる。本疾患においては,聴覚機能温存が重要であるが,腫瘍サイズが聴覚機能温存に重要な因子として考えられている。
Between September 2002 and December 2019, 23 lesions of vestibular schwannoma that had received hypo-fractionated stereotactic radiotherapy using the CyberKnife were reported. The mean radiation doses were 22 Gy(range, 17-28 Gy in 3-7 fractions). Although ten-year local control rate was 100%, two lesions underwent surgical retreatment due to brainstem compression associated with cyst formation. The improvement of dizziness and hearing preservation rates were 33% and 100%, respectively. Careful follow-up is required when cysts formed after stereotactic radiotherapy for vestibular schwannoma.
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