MRIが有用であった乳児脊髄脂肪腫の1例

Intraspinal Lipoma of an Infant: A case report with MRI study

I．はじめに

　腰仙部脊髄脂肪腫は比較的稀な疾患とされ，全脊髄腫瘍の約1％を占めると言われている．潜在性二分脊椎症に合併することが多く，皮下脂肪腫も伴いやすい．腰仙部皮下脂肪腫は主に新生児，乳児期に発見されるが，その際二分脊椎，脊髄脂肪腫の併存を疑い精査を進める必要がある．私たちは，腰仙部皮下脂肪腫，潜在性二分脊椎を合併した脊髄脂肪腫で，手術を施行した乳児を経験し，診断上CTに加えMRI（magnetic resonance imag—ing）が有用であったので，画像診断と手術所見につき，若干の文献的考察を加え報告したい．

A 6-month-old boy having intraspinal lipoma with lumbosacral subcutaneous lipoma and occult spinal dys-raphism is described. CT scan and megnetic resonance imaging (MRI) are demonstrated.

On admission, the patient showed no nourological de-ficits. Lumbosacral hemangioma and subcutaneous lipo-ma were noticed on physical examination. A plain spin-al roentogenogram revealed occult spinal dysraphism extending from L 4 level clown to the sacral region. A plain CT scan disclosed a round-shaped low density area surrounded by a relatively high density area cor-responding to the neural tissue in the spinal canal.