BACKGROUND AND OBJECTIVES: The neurocentral synchondrosis (NCS) is a cartilaginous growth plate that since the early 1900s has been implicated as a potential cause of adolescent idiopathic scoliosis (AIS). Previous studies have focused only on the closure age without characterizing normal NCS development. Using MRI, the normal development of the NCS image can be characterized, and the stages preceding the disappearance of this image can be specified. METHODS: A total of 405 NCSs were visualized in 11 normal pediatric patients using T1 and T2 transverse and sagittal MRI views. The images were correlated and the variety of images recorded to categorize the NCS into developmental stages. RESULTS: The development of the NCS was categorized into five developmental stages. The image of the NCS became absent in a specific pattern along the vertebral column, first in the cervical region (age 6), then in the lumbar region (age 12), and finally in the thoracic region (age 14). CONCLUSION: The normal development of the NCS at the level of individual vertebrae and also along the vertebral column as a whole was determined using MRI. These patterns of development are valuable and necessary to evaluate the role of the NCS in pathological conditions. 相似文献
目的:探讨波及黄斑区的孔源性视网膜脱离(RRD)行巩膜扣带手术前后黄斑区三维光学相干断层扫描图像(3D-OCT)特征,分析其与视力的相关性。方法:回顾性系列病例,30例30眼波及黄斑区的RRD行巩膜扣带术治疗的临床资料,在术后2d,2wk,1、3、6mo随诊时双眼均行3D-OCT检查,观察椭圆体带(EZ)、外界膜(ELM)、黄斑区视网膜下液高度(SRFH)、黄斑中心凹视网膜厚度(CRT)的变化,分析其与术后最佳矫正视力(BCVA)的关系。结果:术前,术后2d,2wk,1、3、6mo SRFH、CRT、BCVA均有差异(P<0.01),术后SRFH、CRT都有不同程度降低,术后BCVA都有不同程度升高,组内两两对比:除SRFH(2wk vs 1mo,P>0.05)、CRT(2d vs 2wk,P>0.05)、BCVA(2d vs术前,2wk vs术前,P>0.05)无统计学意义外,其余各项间的比较均有统计学意义(P<0.05)。EZ、ELM形态可分为:A:EZ和ELM均连续(EZ+ELM+),9眼;B:EZ断裂和ELM连续(EZ-ELM+),7眼;C:EZ连续和ELM断裂:EZ+ELM-,6眼;D:EZ和ELM均断裂(EZ-ELM-),8眼,术后6mo上述4种类型的BCVA分别为0.15±0.04、0.50±0.06、0.54±0.05、0.59±0.09(F=87.210,P<0.05),两两比较:除C vs B和C vs D差异无统计学意义(P>0.05)外,其余各组间的比较差异均有统计学意义(P<0.05)。术后2d的SRF发生率为87%,术后6mo仍有46.6%患者存在持续性SRF。术后CRT与术后SRFH具有正相关关系。结论:巩膜扣带术后黄斑微结构呈动态改变,SRF影响可能表现为BCVA延迟恢复,随着SRF缓慢吸收,CRT逐渐降低,BCVA逐渐升高;ELM或EZ连续提示有较好的BCVA,而ELM断裂可能提示视觉质量更差。 相似文献