title: MR angiography in the preoperative evaluation of abdominal aortic aneurysms: a preliminary study.
abstract: OBJECTIVE
  The ability of magnetic resonance (MR) angiography to depict visceral and renal vessels was evaluated in patients with abdominal aortic aneurysms (AAAs).
  
  
  METHODS
  MR sequences (sagittal T1-weighted, two-dimensional coronal, and three-dimensional axial time-of-flight) were compared in a prospective blinded fashion with conventional angiograms obtained preoperatively in 23 patients with AAAs. Results were correlated with surgical findings when available.
  
  
  RESULTS
  Operative aortic clamp site was correctly predicted with conventional angiography in 95% of patients and with MR angiography in 86% (P > .1). Aneurysm neck measurements obtained with the two modalities were within 1 cm in 91% of cases. With conventional angiography as the standard of reference, 96% of all renal arteries were identified on MR angiograms but 36% of accessory arteries were missed. MR angiography enabled identification of patients who had at least one renal artery stenosis greater than 50% with a sensitivity of 100% and specificity of 89%. For identifying individual renal artery, celiac artery, and superior mesenteric artery stenoses of similar severity, the sensitivity and specificity were 67% and in excess of 96%, respectively. The celiac artery could not be evaluated in one case.
  
  
  CONCLUSIONS
  The results of this small study suggest that the role of MR angiography in the preoperative evaluation of AAA warrants further investigation.
authors.affiliation: Department of Radiology, Massachusetts General Hospital, Boston 02114.
authors.forename: J A
authors.initials: JA
authors.lastname: Kaufman
authors.forename: E K
authors.initials: EK
authors.lastname: Yucel
authors.forename: A C
authors.initials: AC
authors.lastname: Waltman
authors.forename: S C
authors.initials: SC
authors.lastname: Geller
authors.forename: M R
authors.initials: MR
authors.lastname: Prince
authors.forename: R P
authors.initials: RP
authors.lastname: Cambria
authors.forename: D C
authors.initials: DC
authors.lastname: Brewster
authors.forename: W M
authors.initials: WM
authors.lastname: Abbott
mesh_terms: D000368:Aged; D017544:Aortic Aneurysm, Abdominal / Q000175:diagnosis* / Q000453:epidemiology / Q000601:surgery; D002445:Celiac Artery / Q000000981:diagnostic imaging / Q000473:pathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D017538:Mesenteric Artery, Superior / Q000000981:diagnostic imaging / Q000473:pathology; D008641:Mesenteric Vascular Occlusion / Q000175:diagnosis / Q000453:epidemiology; D011446:Prospective Studies; D011859:Radiography; D012077:Renal Artery / Q000000981:diagnostic imaging / Q000473:pathology; D012078:Renal Artery Obstruction / Q000175:diagnosis / Q000453:epidemiology; D012680:Sensitivity and Specificity