双源CT在双重压迫型髂静脉受压综合征中的诊断价值

Diagnostic Value of Dual Source CT in Double Compression Type Iliac Vein Compression Syndrome

目的探讨双源CT在双重压迫型髂静脉受压综合征中的诊断价值。方法回顾性分析了31例髂静脉受压综合征患者的CT和数字减影血管造影(Digital Subtract Angiography,DSA)资料。双源CT检查采用双能量扫描法和自动电流跟踪技术。分别计算单一压迫和双重压迫的髂静脉受压程度,观察双重压迫的CT和DSA表现并比较两者的影像学特征。结果在31例患者中观察到单一和双重压迫的比例分别为67.7%(n=21)和32.3%(n=10),左髂总静脉在最大压迫处的平均直径单一压迫为(3.21±1.06)mm,双重压迫为(2.91±1.39)mm,两者差异无显著性意义。双重压迫通常表现为两种类型:一种是沿着左髂总静脉上面的长段压迫,另一种是近髂外静脉开口处的纵向压迫。单一和双重压迫的受压率差异没有显著性意义(P=0.57)。结论双重压迫型髂静脉受压综合征并不少见,CT血管成像对其有重要诊断价值。

Objective To assess the diagnostic value of dual source CT in double compression type iliac vein compression syndrome. Methods The CT and digital subtraction angiography （DSA） data of 31 cases with iliac vein compression syndrom were analyzed retrospectively. Dual source CT examination was performed by dual energy scanning and automatic current tracking technology. Single compression type and double compression type of the iliac vein compression were evaluated respectively in order to observe the performance of CT and DSA in double compression subjects and to compare the two imaging features. Results In 31 cases of subjects, the proportions of single compression type and double compression type were 67.7% （n=21） and 32.3% （n=10） respectively. The average diameter of the left common iliac vein at the maximum compression was （3.21±1.06） mm in single compression type, and （2.91±1.39） mm in double compression type. There was no signifcant difference between the two groups. There were two manifested forms for double compression type： one was the long section of compression along the superior left common iliac vein, the other was the longitudinal compression of the proximal external iliac vein opening. The compression ratios were not different between the two groups （P=0.57）. Conclusion Double compression type iliac vein compression syndrome is not uncommon. CT angiography is of great value in its diagnosis.