title: Serial CT volume measurements after endovascular aortic aneurysm repair.
abstract: OBJECTIVE
  To evaluate the efficacy of transluminal stent-graft placement in aortic aneurysms using postoperative enhanced spiral computed tomographic (CT) volumetric measurements of the aneurysm sac, the intra-aneurysmal vascular channel (IAVC), the thrombus, and the stent-graft.
  
  
  METHODS
  Among 53 patients (45 men; mean age 74 years, range 59-85) who underwent elective endovascular aortic aneurysm repair, 37 patients with 27 abdominal and 10 thoracic aortic aneurysms completed at least a 6-month follow-up that included computerized CT volumetric analysis prior to discharge and at 3, 6, 12, 24, and 36 months. A variety of bifurcated (n = 23) and tube (n = 14) stent-grafts were observed for signs of endoleak and aneurysm enlargement.
  
  
  RESULTS
  Mean follow-up was 16 months (range 6-48). Total aneurysm volumes and thrombus volumes decreased, whereas IAVC and stent-graft volumes increased over time. Between the postoperative and 12-month imaging studies, reductions in total aneurysm (p 0.011) and thrombus (p < 0.001) volumes were significant. No statistically significant difference in volume changes for the aneurysm sac (p = 0.555) or the thrombus (p = 0.920) was found when comparing the 24 patients without primary leak to the 12 with primary type-II leak. In all 5 cases with secondary leak, the volume of the aneurysm sac increased after initial shrinkage.
  
  
  CONCLUSIONS
  Postoperative CT volumetric analysis is an effective tool for evaluating the outcome of endovascular aortic aneurysm repair. Thrombus volume measurements are more accurate than total aneurysm volumes. In patients in whom contrast agents are contraindicated, volume measurements can also be obtained without the use of contrast.
authors.affiliation: Department of Radiology, Leopold-Franzens Medical School and University Hospital, Innsbruck, Austria. benedikt.czermak@uibk.ac.at
authors.forename: B V
authors.initials: BV
authors.lastname: Czermak
authors.forename: G
authors.initials: G
authors.lastname: Fraedrich
authors.forename: M F
authors.initials: MF
authors.lastname: Schocke
authors.forename: I E
authors.initials: IE
authors.lastname: Steingruber
authors.forename: P
authors.initials: P
authors.lastname: Waldenberger
authors.forename: R
authors.initials: R
authors.lastname: Perkmann
authors.forename: M
authors.initials: M
authors.lastname: Rieger
authors.forename: W R
authors.initials: WR
authors.lastname: Jaschke
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D017130:Angioplasty; D017544:Aortic Aneurysm, Abdominal / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D017545:Aortic Aneurysm, Thoracic / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D013927:Thrombosis / Q000175:diagnosis / Q000209:etiology; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome