title: Vascular artifact mimicking thrombosis on MR imaging using ferumoxytol as a contrast agent in abdominal vascular assessment.
abstract: OBJECTIVE
  To describe an artifact that mimics thrombosis when assessing abdominal vasculature on magnetic resonance (MR) imaging using ferumoxytol in patients with contraindications to gadolinium-based contrast agents and to evaluate factors that may contribute to this artifact.
  
  
  METHODS
  Three radiologists in consensus retrospectively evaluated 61 abdominal MR imaging examinations using ferumoxytol as an intravenous contrast agent for the presence of an observed artifact that can mimic thrombosis. Patient demographics and contrast agent bolus concentrations were compared with an unpaired Wilcoxon signed rank test.
  
  
  RESULTS
  An artifact mimicking thrombosis was observed in 30 of 61 examinations, all on the arterial phase sequences. In examinations with this artifact, the average concentration of administered ferumoxytol was greater than in examinations where the artifact was not observed (P < .01). Several additional vascular findings were observed, including portal vein thrombosis (n = 2) and aneurysm (n = 1), renal vein thrombosis (n = 2), abdominal aortic aneurysm (n = 1), abdominal and iliac artery dissection (n = 3), and sequelae of portal hypertension (n = 8).
  
  
  CONCLUSIONS
  Although MR imaging using ferumoxytol as an intravenous contrast agent can be useful in detecting abdominal vascular abnormalities, an artifact mimicking vascular thrombosis was observed in nearly half of the examinations.
authors.affiliation: Department of Radiology, UC Davis Medical Center, 4860 Y Street, Suite 3100, Sacramento, CA 95817. Electronic address: ghaneh.fananapazir@ucdmc.ucdavis.edu.
authors.forename: Ghaneh
authors.initials: G
authors.lastname: Fananapazir
authors.affiliation: Department of Radiology, Duke University Medical Center, Durham, North Carolina.
authors.forename: Daniele
authors.initials: D
authors.lastname: Marin
authors.affiliation: Department of Radiology, Duke University Medical Center, Durham, North Carolina.
authors.forename: Paul V
authors.initials: PV
authors.lastname: Suhocki
authors.affiliation: Department of Radiology, Duke University Medical Center, Durham, North Carolina.
authors.forename: Charles Y
authors.initials: CY
authors.lastname: Kim
authors.affiliation: Department of Radiology, Duke University Medical Center, Durham, North Carolina.
authors.forename: Mustafa R
authors.initials: MR
authors.lastname: Bashir
mesh_terms: D000005:Abdomen / Q000098:blood supply*; D061605:Administration, Intravenous; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001158:Arteries / Q000473:pathology; D016477:Artifacts; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D052203:Ferrosoferric Oxide / Q000008:administration & dosage; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D013927:Thrombosis / Q000175:diagnosis*; D014680:Veins / Q000473:pathology; D020246:Venous Thrombosis / Q000175:diagnosis; D055815:Young Adult
chemical_list: D003287:Contrast Media; D052203:Ferrosoferric Oxide