馬尾に発生したclear cell meningiomaの1例

Clear Cell Meningioma of the Cauda Equina. Case Report

　馬尾に発生したclear cell meningiomaの1例を経験したので報告する．症例は23歳の男性で，両下肢筋力低下があり，MRIでL1からL5にかけて脊柱管内を占拠する腫瘍を認めた．腫瘍と硬膜との付着は認めず，全摘可能だった．病理診断はclear cell meningiomaでMIB-1 indexは15～18％だった．術後，症状は改善したが，再発の可能性を考え放射線治療を追加した．Clear cell meningiomaは再発の可能性があり，今後の経過観察が必要である．

　We report a case of clear cell meningioma that arose in the cauda equina.　The patient was a 23-year-old man in whom an MRI examination revealed a tumor occupying the spinal canal from L1 to L5.　The tumor was not attached to the dura mater, and we performed a total resection.　The pathological diagnosis was clear cell meningioma, and the MIB-1 index was 15-18%.　Radiation therapy was performed postoperatively.　Clear cell meningiomas sometimes recur, recurrence, and careful follow-up will be necessary.