腰椎后缘软骨结节的CT探讨

CT Study of Lumbar Posterior Marginal Intraosseous Node

目的 分析腰椎后缘软骨结节的 CT表现并探讨其发病机制。方法 观察 2 5 12例腰椎间盘突出和其中49例腰椎后缘软骨结节 ,分析其临床和 CT表现特点。结果 腰椎后缘软骨结节好发年龄为 2 0～ 40岁 ,以 S1 和 L5 后上缘最常见 ,约占腰椎间盘突出病人的 2 %。软骨结节的形态以类圆形最多见 ,多有硬化边缘。裂隙形或边缘无硬化者可能为本病早期改变。软骨结节下多形成骨性突起 ,造成椎管矢状径变小 ;软骨结节常使椎体终板变形后膨 ,导致椎体侧隐窝狭窄。结论 腰椎后缘软骨结节与腰椎间盘突出相互促进 ,CT是本病较好的检查手段。

Objective To study the CT manifestation and pathogeny of lumbar posterior marginal intraosseous cartilagious node (LPMN).Method 2512 cases with herniation of intervertebral discs were studied in which 49 cases of LPMN were observed by its clinics and character of CT manifestation.Result Most of LPMN were in 20～40 years and the posterior superior margins of L 5 and S 1 were the commonest sites.LPMN made up 2 percent of the total herniation of intervertebral discs.The shapes of the intraosseous cartilaginous nodes were paracircle mostly.The shapes of rift and no hardmargin probably were the manifestations at the early stage.Bony protrusions below the intraosseous cartilaginous node were often formed and resulted in the sagittal diameter of the vertebral tube being changed narrow.LPMN often made the vertebral plate be out of shape and expand backwards and led to lateral crypts of vertebra narrowed.Conclusion LPMN and herniation of intervertebral discs help each other forward.CT was one of the most effective ways to find them. [