腰椎椎弓峡部裂的CT诊断价值

CT diagnostic value of isthmic defect in lumbar spine

目的 :探讨CT对腰椎弓峡部裂的诊断价值。方法 :回顾性分析 48例腰椎弓峡部裂的CT表现。根据腰椎定位像 ,采用与椎间盘前后缘中点连线平行角度 ,扫描范围包括病变椎体的椎弓平面至下一椎体上缘 ,层厚、层距 5 .0mm ,必要时 2 .0mm ,骨窗和脊髓窗双窗位观察。结果 :48例均显示脊椎椎弓峡部层面关节突间部低密度裂隙 ,断面呈锯齿状 ,即“裂隙征”。裂隙周缘骨硬化和 /或出现碎骨片 ,呈现“假肥大小关节”。脊椎滑脱则呈现“假性椎间盘突出征”及”阶梯征”。结论 :椎弓峡部CT薄层扫描对于峡部裂的清晰显示率较X线平片高 。

Objective:To study the CT diagnostic value of isthmic defect in lumbar spine.Methods:CT manifestations of 48 cases of isthmic defect in lumbar spine were retrospectively analysed. CT axial scans were parallel to the intervertebral disc, and it's ranges contained plane of vertebral arch to upside of next vertebral body(slice thick=5mm or special 2mm). Both bone window and marrow window were observed.Results: Low density crannies were found in articular process of isthmus plane, namely 'cranny sign'. 'Unreal herniated disc sign' and'ladder sign' were appeared in spondylolisthesis.Conclusion: CT thin scans were provided with important clinical meaning because which improved diagnostic accuracy rather than X-ray plain film.