title: Detection and follow-up of important extra-arterial lesions with helical CT angiography.
abstract: OBJECTIVE
  To determine the prevalence and significance of extra-arterial findings detected prospectively on helical computed tomographic angiography (CTA).
  
  
  METHODS
  The official reports of 802 consecutive CTAs performed over a 4.5-year period on 624 patients and the reports of all radiographic follow-up studies were reviewed for identification of important extra-arterial findings. Medical records and imaging studies of all patients with previously unknown extra-arterial findings on CTA were reviewed to assess follow-up. In cases where follow-up was not indicated in the medical record, referring physicians were contacted directly.
  
  
  RESULTS
  Important, previously unknown, extra-arterial findings were detected on 35 CTAs (4.4% of all CTAs, 5.6% of all patients), with 33 of 35 detected prospectively. Six lesions were consistent with and/or proven to be malignant. Important non-tumoural lesions were discovered on nine CTAs. Of 13 lesions with imaging features that were suspicious for malignancy. Five of these lesions proved to be benign, but radiographic and/or clinical follow-up was not obtained or could not be documented in eight patients.
  
  
  CONCLUSIONS
  With the increasing use of CTA as a replacement for conventional angiography, careful attention should be paid to the visualized extra-arterial structures. Extra-vascular findings that are believed to be significant, may not be adequately followed-up by referring vascular specialists.
authors.affiliation: Department of Radiology, Stanford University School of Medicine, CA 94305-5105, USA.
authors.forename: D S
authors.initials: DS
authors.lastname: Katz
authors.forename: M J
authors.initials: MJ
authors.lastname: Jorgensen
authors.forename: G D
authors.initials: GD
authors.lastname: Rubin
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000792:Angiography / Q000379:methods*; D002983:Clinical Competence; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009369:Neoplasms / Q000000981:diagnostic imaging*; D011446:Prospective Studies; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed