中文摘要：

背景：颅、颈交界区解剖结构复杂,术前观察枕寰枢复合体后方静脉丛是非常必要的。利用三维CT血管成像技术显示这些结构具有明显的优势。目的：观察枕寰枢复合体后方静脉丛结构的解剖特点。方法：随机筛选60例患者头颈部CTA枕寰枢复合体无明确异常资料,回顾性分析其三维CT成像,测量枕寰枢复合体后方静脉结构,描述枕寰枢复合体的空间关系。结果与结论：统计学处理结果显示除寰枢关节后硬膜外静脉丛至中线距离左、右侧有显著性差异（P〈0.05）外,枕下海绵窦体积、寰枢外侧关节后硬膜外静脉丛体积、枕下海绵窦与中线距离、颈深静脉C1段水平直径及至中线距离、C1后弓距离的测量值左、右侧,男、女性之间差异均无显著性意义（P〉0.05）。提示枕寰枢复合体后方静脉、静脉丛血管丰富、其形态或结构变异复杂,存在不确定的变异。

英文摘要：

BACKGROUND： Anatomy structure of craniocervical junction is complicated, it is necessary to preoperatively observe the vein structure behind the atlantoaxial complex. Three-dimensional CT angiography （CTA） has obvious advantages in showing them. OBJECTIVE： To observe the complex venous plexus structure behind the atlantoaxial complex. METHODS： Sixty subjects who were performed CTA in head and neck without any pathology of craniocervical junction, were selected at random. Three-dimensional CT images of them were analyzed retrospectively to measure the structure of the vein behind atlantoaxial complex and describe the spatial relationship of atlantoaxial complex. RESULTS AND CONCLUSION： Statistical analysis showed that there were significant differences in the volume of suboccipital cavernous sinus （SCS） and epidural venous plexus （EVP）, the distance from SCS to midline on the left and right sides, the diameter of deep cervical vein （DCV） at the level of posterior arch of the atlas, the distance from DCV to the midline and to posterior arch of the atlas on the left and right sides and measurements between male and female （P 0.05） except the distance from EPV to midline on the left and right sides （P 0.05）. It is indicated that vein and venous plexus behind atlantoaxial complex are rich and complicated in sharp or structure with uncertaion variations.