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I.はじめに
neurofibromatosisに種々の脊椎骨病変が合併3-8,10,12)することは古くから知られているが,atlantoaxial dis-location(以下A-A dislocationと略す)の合併例に関してはほとんど注目されていない.われわれが調べえた範囲では,本邦に3例3,6,10).外国に1例12)の計4症例であり,非常に稀なものと思われる,われわれはneuro-fibromatosisに合併したA-A dislocationの稀な3症例を経験したので,症例を報告するとともに,その成因につき考察を加えた.
Atlantoaxial dislocation has received little attention inmany studies of spinal deformity in neurofibromatosis.The only four cases of atlantoaxial dislocation associated withneurofibromatosis has been previously reported in theliterature. We reported three rare cases of atlantoaxialdislocation associated with neurofibromatosis. Thesecharacteristics in roentgenogram were as follows;(1) markednarrowing of sagittal diameter at C1level without instability(instability index 0%) (2) association with other mesodermaldysplasia, such as posterior vertebral body scalloping,vertebral body dysplasia, dural ectasia etc.
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