同一馬尾に数珠状に発生した多発性神経鞘腫の1例

Schwannomatosis Exhibiting a Beaded Appearance in the Single Spinal Nerve Root in the Cauda Equina. Case Report

　62歳の女性で2カ月前からの腰痛と左下肢のしびれを主訴に受診し，MRIで多発性脊髄腫瘍を認めた．脊髄造影，脊髄造影CTにより第12胸椎から第2腰椎高位の多発性脊髄腫瘍の診断で手術を施行した．同一馬尾に数珠状に多発する馬尾腫瘍であり，腫瘍の両端で神経切除とした．病理組織診断はいずれも神経鞘腫であった．神経鞘腫は脊髄腫瘍の中で高頻度に認められる腫瘍であるが，同一馬尾に多発することは稀である．今回われわれは，同一馬尾に数珠状に発生した多発神経鞘腫の1例を経験したので，若干の文献的考察を加え報告する．

　A 62-year-old woman was admitted to our hospital with a 2-month history of low back pain and numbness of the left leg.　MRI, myelography, and CTM revealed multiple spinal cord tumors in the cauda equina.　At surgery multiple tumors were found on a single spinal nerve root in the cauda equina in a bead-like pattern.　Histopathological examination showed that all of the tumors were typical schwannomas.　Schwannoma is a common spinal cord tumor, but reports of multiple spinal cord tumors, in a single spinal nerve root in the cauda equina have been rare, except in von Recklinghausen disease.　We report a case of schwannomatosis having a beaded appearance in a single spinal nerve root in the cauda equina.