RESUMO
Objective To investigate the diagnostic value of enhanced MR subtracted venography (MRsV)in iliac vein stenosis. Methods 21 patients were recruited for unilateral venous circulation disorders,and they were all performed two kinds of MR venography,including time of flight (TOF)and MRsV.All raw data were reconstructed and maximum intensity proj ection (MIP)images were gained after post-processing in workstation.The image quality and diagnostic accuracy were evaluated by two experienced radiologists.All the results were analyzed,with P<0.05.Results 18 patients were enrolled in our study with good image quality,including 10 cases of unilateral iliac venous thrombosis,1 case of iliac venous stenosis infiltrated by tumor recurrence,3 cases of IVCS and 4 cases without iliac venous thrombosis.The sensitivity and specificity of MRsV-MIP were higher than TOF-MIP (100% vs 92.3%,100% vs 75%,respectively). There was significant difference in diagnostic accuracy between MRsV-MIP and TOF-MIP(χ2=4.827 2,P=0.028 0).Conclusion MRsV demonstrates better image quality and diagnostic performance than TOF in evaluation of iliac vein stenosis.MRsV has greater potential in providing the differential diagnosis evidence in venous stenosis.It could be established as an independent iliac venous imaging method.