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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.
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Objective To evaluate the value of MRI diagnosis in Stewart-Treves syndrome(STS).Methods The 48 STS nodules proved by pathology were retrospectively studied,which compared the MRI findings and pathological results.Results All nodules were solid and more than 4 mm in diameter.According to the expression of D2-40 and CD31,all nodules were divided into two types.The 47 nodules were divided into STS type I(hemangiosarcoma).The MRI findings showed slightly low signal on T1 WI and slightly high signal on T2 WI,while were higher than the muscular signal.Additionally,all nodules of STS type I were remarkably enhanced.The 1 mass-like-shape cases wsa divided into STS type Ⅱb (mixed lymphangiosarcoma).The MRI findings showed heterogeneous signal on both T1 WI and T2 WI,in which the high signal was leading.And the enhancement showed the low-level inhomogeneous signal.Conclusion MRI could be a valuable tool for the diagnosis in STS because of the characteristic signal on MRI.And if combined with the history of chronic upper limb lymphedema,the diagnostic accuracy could be improved before surgery.
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Objective To evaluate the value of magnetic resonance thoracic ductography (MRTD)and magnetic resonance (MR) pelvic scanning in the chylous leakage of female reproductive system.Methods A retrospective evaluation of the imaging findings of MRTD and MR pelvic in 7 patients was performed,and compared with direct lymphangiography (DLG),lymphoscintigraphy and surgery.Results The rate of thoracic duct visualization in DLG was 71 .4% (5/7 ).The rate of venous angle visualization inlym-phoscintigraphy was 71.4% (5/7).The rate of thoracic duct visualization in MRTD was 100% (7/7).Except for 1 case withgeneral-ly normal findings,the remaining 6 cases showedobstruction of the thoracic duct in MRTD.Among those cases,bilateral drainage was found in 1 case,right thoracic ductwas seen in 1 case,multiple tortuous dilated lymphatic channelsaround the venous angle was detected in 4 cases,and multiple lymphangiomas was seen in 1 case.All of the 7 patients were conducted by surgery.6 cases were confirmed as obstruction of the thoracic duct.MRTD & MR pelvic found more multiple lymphangiomas lesions and detected 2 cases with bone abnormalities.Conclusion MRTD combined with MR pelvic could provide more comprehensive assessment of female re-productive system chylous leakage.It should be used as routine examination before operation.
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Objective To evaluate the effect of magnetic resonance thoracic ductography (MRTD)in the diagnosis of right thoracic duct.Methods MRTD data were analyzed retrospective,and the detection rate of right thoracic duct was summarized and compared with that of lymphoscintigraphy,direct lymphangiography and operation.Results 12 cases of right thoracic duct were detected in 1547 cases of MRTD.The detection rate was 0.78%,in which 1 case was complied with total internal organs inversion,and 1 case with right aortic arch.Lymphoscintigraphy were performed in all 12 cases and right thoracic duct were detected in 4 cases.Direct lymphangiography were performed in 4 cases and right thoracic duct were observed in all of them.7 cases of them received right lum-bar duct adhesiolysis.Conclusion MRTD is a noninvasive method for diagnosis of right thoracic duct,which providing useful guid-ance for surgical operation.Its detection rate and diagnostic accuracy are higher than those of lymphoscintigraphy.
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Objective To describe the MRI findings in patients with Acquired hepatiocerbral Degeneration(AHCD) and evaluate the role of MRI in dignosis of AHCD. Methods 26 patients with chornic hepatic failure under went brain MRI scan. Eight of these patients had abdominal MR digital subtract angiography(MRDSA) examnation. 25 patients had plasma ammonia levels test two weeks after MR exmnation. Results 22 patients had abnormal MRI findings, T 1WI demonstrated incresed signal in the globus pallidus (22/26), putmen (4/26), mesencephalon surrounding red nucleus(15/26),and in the anterior pituitary (12/26). While T 2WI demonstraied no corresponding alteration in signal intensity. Eight patients which had MRDSA showed obvious portal systemic shunts. There was positive correlation between plasam ammonia level and abnormal signal( r = 0.521 6, P