title: Intracranial aneurysms treated with Guglielmi detachable coils: is contrast material necessary in the follow-up with 3D time-of-flight MR angiography?
abstract: OBJECTIVE
  Three-dimensional time-of-flight (TOF) MR angiography has been evaluated in the follow-up of intracranial aneurysms treated with Guglielmi detachable coils (GDCs) with good results. Some of the studies used contrast material in addition to the 3D TOF MR technique and others did not. We assessed the usefulness of contrast material with 3D TOF MR angiography by comparing this sequence before and after contrast material injection.
  
  
  METHODS
  Fifty-eight patients harboring a total of 71 cerebral aneurysms previously treated with GDCs were included in the prospective study. MR angiography (at 1.5 T) was performed with a 3D TOF sequence before and after injection of gadolinium-based contrast material. Features evaluated were presence and size of a neck remnant, parent and adjacent vessel patency, and venous overlap. Digital subtraction angiography was the standard of reference.
  
  
  RESULTS
  Comparison of the techniques showed a good agreement in the detection of residual flow. Six cases of small residual neck were not detected with either the 3D TOF or the contrast-enhanced 3D TOF sequence. In one case of giant aneurysm, the extent of recanalization was more evident after contrast material administration. The use of contrast material did not help to show the parent and adjacent arteries. Venous overlap on contrast-enhanced 3D TOF angiograms did not affect image interpretation.
  
  
  CONCLUSIONS
  In this series, the use of intravenous contrast material did not improve the ability of 3D TOF MR angiography to depict the presence of residual or recurrent aneurysms previously treated with endovascular coiling. In one giant aneurysm, use of intravenous contrast material did result in improved visualization of a residual aneurysm.
authors.affiliation: Department of Neuroradiology, Hôpital Bretonneau, Tours, France.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Cottier
authors.forename: Aurore
authors.initials: A
authors.lastname: Bleuzen-Couthon
authors.forename: Sophie
authors.initials: S
authors.lastname: Gallas
authors.forename: Catherine B
authors.initials: CB
authors.lastname: Vinikoff-Sonier
authors.forename: Philippe
authors.initials: P
authors.lastname: Bertrand
authors.forename: Florence
authors.initials: F
authors.lastname: Domengie
authors.forename: Laurent
authors.initials: L
authors.lastname: Barantin
authors.forename: Denis
authors.initials: D
authors.lastname: Herbreteau
mesh_terms: D015901:Angiography, Digital Subtraction; D003287:Contrast Media; D004621:Embolization, Therapeutic / Q000295:instrumentation*; D005260:Female; D005682:Gadolinium; D006801:Humans; D021621:Imaging, Three-Dimensional; D002532:Intracranial Aneurysm / Q000175:diagnosis* / Q000628:therapy; D018810:Magnetic Resonance Angiography; D008297:Male; D008536:Meglumine; D008875:Middle Aged; D009942:Organometallic Compounds; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012008:Recurrence; D012680:Sensitivity and Specificity
chemical_list: D003287:Contrast Media; D009942:Organometallic Compounds; D008536:Meglumine; D005682:Gadolinium; C072417:gadoterate meglumine