title: Follow-up of true visceral artery aneurysm after coil embolization by three-dimensional contrast-enhanced MR angiography.
abstract: OBJECTIVE
  We aimed to evaluate the outcomes of coil embolization of true visceral artery aneurysms by three-dimensional contrast-enhanced magnetic resonance (MR) angiography.
  
  
  METHODS
  We used three-dimensional contrast-enhanced MR angiography, which included source images, to evaluate 23 patients (mean age, 60 years; range, 28-83 years) with true visceral artery aneurysms (splenic, n=15; hepatic, n=2; gastroduodenal, n=2; celiac, n=2; pancreaticoduodenal, n=1; gastroepiploic, n=1) who underwent coil embolization. Angiographic aneurysmal occlusion was revealed in all cases. Follow-up MR angiography was conducted with either a 1.5 or 3 Tesla system 3-25 months (mean, 18 months) after embolization. MR angiography was evaluated for aneurysmal occlusion, hemodynamic status, and complications.
  
  
  RESULTS
  Complete aneurysmal occlusion was determined in 22 patients (96%) on follow-up MR angiography (mean follow-up period, 18 months). Neck recanalization, which was observed at nine and 20 months after embolization, was confirmed in one of eight patients (13%) using a neck preservation technique. In this patient, a small neck recanalization covered by a coil mass was demonstrated. The complete hemodynamic status after embolization was determined in 21 patients (91%); the visualization of several collateral vessels, such as short gastric arteries, after parent artery occlusion was poor compared with that seen on digital subtraction angiography in the remaining two patients (9%). An asymptomatic localized splenic infarction was confirmed in one patient (4%).
  
  
  CONCLUSIONS
  Our study presents the follow-up results from three-dimensional contrast-enhanced MR angiography, which confirmed neck recanalization, the approximate hemodynamic status, and complications. This effective and less invasive method may be suitable for serial follow-up after coil embolization of true visceral aneurysms.
authors.affiliation: Department of Radiology (M.Koganemaru e-mail: mkoganemaru@med.kurume-u.ac.jp), Kurume University School of Medicine, Fukuoka, Japan.
authors.forename: Masamichi
authors.initials: M
authors.lastname: Koganemaru
authors.forename: Toshi
authors.initials: T
authors.lastname: Abe
authors.forename: Masaaki
authors.initials: M
authors.lastname: Nonoshita
authors.forename: Ryoji
authors.initials: R
authors.lastname: Iwamoto
authors.forename: Masashi
authors.initials: M
authors.lastname: Kusumoto
authors.forename: Asako
authors.initials: A
authors.lastname: Kuhara
authors.forename: Tomoko
authors.initials: T
authors.lastname: Kugiyama
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000783:Aneurysm / Q000000981:diagnostic imaging* / Q000628:therapy*; D001158:Arteries; D003287:Contrast Media; D004621:Embolization, Therapeutic / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D021621:Imaging, Three-Dimensional; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012189:Retrospective Studies; D014781:Viscera / Q000098:blood supply
chemical_list: D003287:Contrast Media