title: May-Thurner syndrome complicated by acute iliofemoral vein thrombosis: helical CT venography for evaluation of long-term stent patency and changes in the iliac vein.
abstract: OBJECTIVE
  The purpose of this study was to use CT venography to evaluate long-term patency and changes in the iliac veins after stent placement for acute iliofemoral vein thrombosis due to May-Thurner syndrome.
  
  
  METHODS
  From December 1999 to July 2007, 30 patients (22 women, eight men; age range, 30-78 years; mean, 56.7 years) with acute iliofemoral vein thrombosis due to May-Thurner syndrome diagnosed with CT venography were treated with catheter-directed thrombolysis and stent placement. The patients underwent follow-up CT venography at variable intervals according to clinician discretion. The primary objective was to determine the primary patency of the stented segment. The secondary objective was to investigate the potential role of CT venography by analyzing the morphologic features and interval changes in stented iliac veins. Cumulative primary and secondary stent patency rates were calculated by Kaplan-Meier estimation.
  
  
  RESULTS
  Four stent occlusions and one stent collapse were found at the first follow-up CT venographic examination within 1 year (mean duration, 129.3 days) after treatment. One stent occlusion and one stent collapse were managed successfully. The primary and secondary patency rates were 83.3% and 90% 1 and 5 years after treatment. The morphologic features of the common iliac vein did not affect stent patency or expanded stent diameter. During sequential CT venographic follow-up, no new in-stent stenosis or occlusion was found.
  
  
  CONCLUSIONS
  Iliac stents placed for May-Thurner syndrome with acute thrombosis had excellent long-term patency. Restenosis or occlusion occurred early, and initial luminal patency was well maintained during long-term follow-up.
authors: Department of Radiology, Medical Research Institute, Yangsan Hospital, Pusan National University, Pusan, Korea.
authors: Ung Bae
authors: UB
authors: Jeon
authors: Jin Wook
authors: JW
authors: Chung
authors: Hwan Jun
authors: HJ
authors: Jae
authors: Hyo-Cheol
authors: HC
authors: Kim
authors: Sang Joon
authors: SJ
authors: Kim
authors: Jongwon
authors: J
authors: Ha
authors: Jae Hyung
authors: JH
authors: Park
mesh_terms: D000328:Adult; D000368:Aged; D003251:Constriction, Pathologic; D003287:Contrast Media; D005260:Female; D005268:Femoral Vein / Q000000981:diagnostic imaging*; D006801:Humans; D007084:Iliac Vein / Q000000981:diagnostic imaging*; D007472:Iohexol / Q000031:analogs & derivatives; D008297:Male; D008875:Middle Aged; D016491:Peripheral Vascular Diseases / Q000150:complications*; D010690:Phlebography / Q000379:methods*; D011446:Prospective Studies; D011857:Radiographic Image Interpretation, Computer-Assisted; D012008:Recurrence; D015607:Stents; D013577:Syndrome; D036542:Tomography, Spiral Computed / Q000379:methods*; D016896:Treatment Outcome; D014654:Vascular Patency; D020246:Venous Thrombosis / Q000000981:diagnostic imaging* / Q000628:therapy
chemical_list: D003287:Contrast Media; D007472:Iohexol; C038192:iopromide