頚髄症に対する後方内視鏡下除圧術後に生じたC5麻痺の2例

C5 Palsy after Posterior Microendoscopic Laminotomy for Cervical Myelopathy

　頚髄症に対する内視鏡下除圧術（microendoscopic laminectomy：MEL法）後に生じたC5麻痺を2例経験した．症例1は76歳の男性で，C4-6までのMEL後にC5麻痺を発生した．症例2は63歳の男性で，C3-5のMEL後にC5麻痺を発生した．2例ともC5麻痺は進入側と同側に発生した．保存的治療により筋力は改善傾向である．多椎間除圧による脊髄の後方シフトに伴う神経根の牽引がC5麻痺の原因と考えられた．

　We report two cases of C5 palsy following microendoscopic decompressive laminotomy (MEL) for treating cervical spondylotic myelopathy. Patients were 2 men aged-76 and 63. Both had C5 palsy on the approach side and multilevel decompression. Paralysis developed after 2 days and improved with conservative therapy. The possible mechanism leading to C5 palsy after MEL to multilevel involvement is the posteromedial shift of the dural sac when interosseous segments are removed.