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I.はじめに
脊髄(椎)血管腫は全脊髄空間占拠性疾患の3.3-12.5%を占めるが,脊髄硬膜外血管腫はそのうち8%以下にすぎず,さらに硬膜外のみに存在することは極めて少ないとされてきた2,17,19).しかし最近Piaらは,脊髄血管腫が全中枢神経系血管奇形の40%以上を占め,硬膜外血管腫もその47%に達したと報告し,今まで考えられていたよりはるかに多いことがわかってきた19,20).
硬膜外血管腫は通常脊髄の動脈と直接関係がないため,臨床像は一定せず診断は困難とされ,現在までの報告例の主要症状は,急性脊髄横断症状,坐骨神経痛などと特徴的なものはない20,22).
A case of spinal epidural AVM with unusual clinical course was presented. A 28-year-old male had re-peated episodes of paraparesis and complete recovery in several hours. Metrizamide myelography revealed the dorsal epidural mass at the level of L2 and L3. Accidental epidurogram during the procedure indi-cated extradural angioma. Surgical intervention proved solitary spinal epidural AVM.
Ninety-nine cases in literature were reviewed. Among them, 14 cases of spinal epidural hematoma were due to ruptured angioma which were verified histologically. Others were unknown causes. Age distribution was discussed.
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