title: Evaluation of contrast-enhanced MR angiography in the follow-up of visceral arterial aneurysms after coil embolization.
abstract: BACKGROUND
  The placement of detachable coil has become the alternative method of treating visceral arterial aneurysms (VAAs). Imaging follow-up is necessary after coil embolization because of frequent incomplete occlusion.
  
  
  OBJECTIVE
  To compare contrast-enhanced magnetic resonance angiography (CE-MRA) at 3T with a reference standard of digital subtraction angiography (DSA) for the evaluation of VAAs after coil embolization.
  
  
  METHODS
  We treated 15 patients with VAA with coil embolization; eight had splenic artery aneurysms and seven had renal artery aneurysms. We packed the aneurysmal sac preserving native arterial circulation. For follow-up, all patients underwent CE-MRA at 3T and DSA. The results were classified according to coil occlusion: Class 1, complete occlusion; Class 2, residual neck; Class 3, aneurysmal filling.
  
  
  RESULTS
  CE-MRA revealed 11 complete occlusions and four residual necks. DSA follow-up showed 12 complete occlusions and three residual necks. No aneurysmal filling occurred after treatment. Comparison of CE-MRA and DSA findings showed 93% agreement (14/15). CE-MRA allowed the detection of a residual neck in one misclassified case in which DSA showed occlusion. Coil-related artifacts were minimal and did not interfere with evaluation of the occlusion status of the VAAs.
  
  
  CONCLUSIONS
  CE-MRA at 3T provides high-quality images equivalent to DSA for the evaluation of VAAs after coil embolization. We suggest that CE-MRA at 3T might be used as the primary method for follow-up of VAAs after coil embolization.
authors: Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto yshkiryu@hotmail.com.
authors: Yasuhiko
authors: Y
authors: Iryo
authors: Department of Radiology, Miyakonojo Medical Association Hospital, Miyakonojo, Japan.
authors: Ichiro
authors: I
authors: Ikushima
authors: Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto.
authors: Toshinori
authors: T
authors: Hirai
authors: Department of Radiology, Miyakonojo Medical Association Hospital, Miyakonojo, Japan.
authors: Kazuchika
authors: K
authors: Yonenaga
authors: Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto.
authors: Yasuyuki
authors: Y
authors: Yamashita
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000783:Aneurysm / Q000628:therapy*; D015901:Angiography, Digital Subtraction; D016477:Artifacts; D003287:Contrast Media; D004621:Embolization, Therapeutic / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012077:Renal Artery; D013157:Splenic Artery; D016896:Treatment Outcome
chemical_list: D003287:Contrast Media
keywords: 3T MRA; Visceral artery aneurysm; coil embolization; follow-up; renal artery aneurysm; splenic artery aneurysm