Abstract No. 470 “Day in the Life of IR” YouTube Series: recruiting undergraduate and medical students to interventional radiology

Abstract

Examinations were performed on Siemens Prisma Fit 3.0 Tesla (n ¼ 3), TIM Trio 3.0 Tesla (n ¼ 2), or Avanto 1.5 Tesla (n ¼ 1) MR scanners. Multiplanar pre-and post-contrast HASTE, T1 vibe, and high-resolution breath-held 3D MRA were acquired. Post processing included reconstruction of multiplanar images, MIP images and 3-D volume rendered images in OsiriX software (Pixmeo; Bernex, Switzerland) and Vitrea software (Vital Images; Minnetonka, MN). Results: All six FE-MRA examinations were technically successful and were diagnostic in the immediate identification of aortic stent endoleaks. The site of endoleak was identified on early steady state imaging and no patients required delayed imaging for diagnosis. Type IA (n ¼ 3), type IB (n ¼ 1), and type II (n ¼ 2) endoleaks were identified. Type II endoleaks included retrograde filling from the inferior mesenteric artery and right lumbar artery. Furthermore, a single patient with three exams over nine months consistently demonstrated a stable large type IA endoleak from the superior aspect of the endograft. No immediate or delayed adverse reactions were observed. Conclusions: In patients with history of EVAR and chronic renal failure or allergy to conventional intravenous contrast agents, ferumoxytol enhanced MRA holds promise for safe and effective evaluation of aortic stent endoleaks.