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- OBJECTIVE: To investigate the impact of axial load on lumbar dural sac. 目的：实验拟探讨轴向负荷对腰椎硬膜囊的影响。
- In 2 cases with spine canal teratoma, heterogeneous signal mass in the dural sac. 椎管内畸胎瘤2例，硬膜囊内不均匀信号团块状占位。
- On midsagittal images, AP dural sac diameter and the upper-endplate angles of L1 and S1 were measured. 在正中矢状位图像上测量了L1和S1水平的硬脊膜囊的前后径和上终板角。
- Key words: lumbar spinal morphology, spinal stenosis, positional MRI, axial load, dural sac cross-sectional area. 要害词：腰椎形态学，椎管狭窄，体位MRI，轴向负荷，硬脊膜囊横断面积。
- In 2 cases with split cord malformation, spinal coal or dural sac were separated by bony or fibrous septum. 脊髓纵裂2例，脊髓硬膜囊被骨性或纤维间隔分开。
- AP dural sac diameter on axial and midsagittal images showed a similar tendency. 前后径在轴位和正中矢状位上呈现相似的变化趋势。
- Depending on the postures, the mean dural sac cross-sectional area and AP dural sac diameter changed. 硬脊膜囊的平均横截面积和前后径随体位的不同而发生变化。
- At all levels, mean dural sac cross-sectional area in the supine position was significantly smaller than in other postures. 在不同脊椎高度，硬脊膜囊的平均横截面积在仰卧位是显著小于其他体位时。
- At all leels, mean dural sac cross-sectional area in the supine position was significantly smaller than in other postures. 在不同脊椎高度，硬脊膜囊的平均横截面积在仰卧位是显著小于其他体位时。
- Results: 16 disk fragments of CT shows the high-density shadow before dural sac with clear boundary Disk fragments of 4 cases connected with the disc. 结果：16例CT表现为椎管内硬膜囊前高密度影边缘较清，4例显示游离碎片与椎间盘呈细窄颈相连。
- On axial images, dural sac cross-sectional area and anteroposterior (AP) dural sac diameter were measured at the leel of the L3/4, L4/5, and L5/S1 discs. 在轴位图像上，硬脊膜囊的横截面面积和前后径分别在L3/4,L4/5和L5/S1椎间盘高度进行测量。
- Objective. To investigate the effect of body position and axial load of the lumbar spine on disc height, lumbar lordosis, and dural sac cross-sectional area (DCSA). 目的：研究体位和轴向负荷对腰椎间盘厚度、腰椎前凸曲线和硬脊膜囊横断面积的作用。
- Objective: To evaluate the diameters of the spinal cord and the dural sac at the maximum sagittal level of the conus medullaris, and their significance in clinical application. 目的:评价正常成人脊髓圆锥水平脊髓和硬膜囊矢径、横径的正常值范围及在临床实践中的应用价值。
- On axial images, dural sac cross-sectional area and anteroposterior (AP) dural sac diameter were measured at the level of the L3/4, L4/5, and L5/S1 discs. 在轴位图像上，硬脊膜囊的横截面面积和前后径分别在L3/4,L4/5和L5/S1椎间盘高度进行测量。
- Conclusion After passing through dural sac, since the sequences, start points and angles are different, the relationship between nerves and intervertebral discs are varied. 结论神经根自硬膜囊发出后，因序列不同，出发点及角度均不同，与椎间盘关系亦不同，在作髓核摘除时应避免损伤；
- The LOA sign is possibly related to a tight dural sac, which causes separation between the posterior dural sac and subjacent lamina in the neutral position. LOA征可能与硬膜囊紧张有关，后者在中位时引起后硬膜囊与邻近椎板之间的分离。
- Magnetic resonance imaging and computed tomographic myelography revealed a huge intraspinal extradural meningeal cyst extending from T12 to L3 with cord and dural sac compression. 核磁共振影像检查及电脑断层脊髓摄影显现一巨大脊椎内硬脊膜外脑脊膜囊肿，范围分布自胸椎第十二节至腰椎第三节，造成前侧脊髓及脊膜腔严重的压迫。
- CT and MRI of 28 cases with protrusion of lumbar disk in surgical. Findings of bulging and herniation by CT and MRI as well pressed, shift, deformed, calcification, vacuum of dural sac and nerve root. 报道经手术证实的28例腰椎间盘突出患者的CT和MRI所见，观察到腰椎间盘膨隆和间盘疝的CT和MRI表现及其所引起的硬膜囊和神经根受压，移位，变形，钙化，真空征等伴随异常。
- Knowledge of the normal range about the position of the lower end of the conus medullaris and the dural sac is very useful in diagnosing tethered spinal cord syndrome and in locating lumbar puncture site. 熟悉脊髓圆锥和硬膜囊下端位置的正常范围 ,能帮助临床诊断脊髓栓系综合征等疾病及腰椎穿刺定位。
- CT can show clearly the changes of LPMN and dural sacs nerve roots. CT is the best examination for LPMN. 结论：CT能清楚显示LPMN的改变及其对硬膜囊和神经根的影响，是LPMN最理想的检查方法。
