title: Usefulness of Non-Contrast-Enhanced MR Angiography Using a Silent Scan for Follow-Up after Y-Configuration Stent-Assisted Coil Embolization for Basilar Tip Aneurysms.
abstract: Y-configuration stent-assisted coil embolization is used for treating wide-neck aneurysms. Noninvasive alternatives to x-ray DSA for follow-up after Y-configuration stent-assisted coil embolization treatment are required. This study aimed to assess the usefulness of non-contrast-enhanced MRA by using a Silent Scan (silent MRA) for follow-up after Y-configuration stent-assisted coil embolization for basilar tip aneurysms.
  
  
  
  Seven patients treated with Y-configuration stent-assisted coil embolization for basilar tip aneurysms underwent silent MRA, 3D TOF-MRA, and DSA. Silent MRA and 3D TOF-MRA images were obtained during the same scan session on a 3T MR imaging system. Two neuroradiologists independently reviewed both types of MRA images and subjectively scored the flow in the stents on a scale of 1 (not visible) to 5 (nearly equal to DSA) by referring to the latest DSA image as a criterion standard. Furthermore, we evaluated the visualization of the neck remnant.
  
  
  
  In all patients, the 2 observers gave a higher score for the flow in the stents on silent MRA than on 3D TOF-MRA. The average score ± standard deviation was 4.07 ± 0.70 for silent MRA and 1.93 ± 0.80 (P< .05) for 3D TOF-MRA. Neck remnants were depicted by DSA in 5 patients. In silent MRA, neck remnants were depicted in 5 patients, and visualization was similar to DSA; however, in 3D TOF-MRA, neck remnants were depicted in only 1 patient.
  
  
  
  Silent MRA might be useful for follow-up after Y-configuration stent-assisted coil embolization.
authors.affiliation: From the Department of Radiology (N.T., M.S., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Graduate School of Medicine, Juntendo University, Tokyo, Japan ntakano@juntendo.ac.jp.|Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: N
authors.identifier: 0000-0003-1506-6849
authors.initials: N
authors.lastname: Takano
authors.affiliation: From the Department of Radiology (N.T., M.S., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Graduate School of Medicine, Juntendo University, Tokyo, Japan.|Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: M
authors.identifier: 0000-0002-2625-1161
authors.initials: M
authors.lastname: Suzuki
authors.affiliation: Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: R
authors.identifier: 0000-0001-7402-3983
authors.initials: R
authors.lastname: Irie
authors.affiliation: Departments of Neurosurgery (M.Y., H.O.).
authors.forename: M
authors.identifier: 0000-0001-9113-7480
authors.initials: M
authors.lastname: Yamamoto
authors.affiliation: Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: N
authors.identifier: 0000-0001-8360-4034
authors.initials: N
authors.lastname: Hamasaki
authors.affiliation: From the Department of Radiology (N.T., M.S., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Graduate School of Medicine, Juntendo University, Tokyo, Japan.|Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: K
authors.identifier: 0000-0001-5028-218X
authors.initials: K
authors.lastname: Kamagata
authors.affiliation: From the Department of Radiology (N.T., M.S., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Graduate School of Medicine, Juntendo University, Tokyo, Japan.|Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: K K
authors.identifier: 0000-0001-5924-3283
authors.initials: KK
authors.lastname: Kumamaru
authors.affiliation: From the Department of Radiology (N.T., M.S., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Graduate School of Medicine, Juntendo University, Tokyo, Japan.|Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: M
authors.identifier: 0000-0002-1791-8032
authors.initials: M
authors.lastname: Hori
authors.affiliation: Departments of Neurosurgery (M.Y., H.O.).|Neuroendovascular Therapy (H.O.), Juntendo University School of Medicine, Tokyo, Japan.
authors.forename: H
authors.identifier: 0000-0003-1446-4888
authors.initials: H
authors.lastname: Oishi
authors.affiliation: From the Department of Radiology (N.T., M.S., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Graduate School of Medicine, Juntendo University, Tokyo, Japan.|Department of Radiology (N.T., M.S., R.I., N.H., K. Kamagata, K.K. Kumamaru, M.H., S.A.), Juntendo University Hospital, Tokyo, Japan.
authors.forename: S
authors.identifier: 0000-0003-2821-0651
authors.initials: S
authors.lastname: Aoki
mesh_terms: D000368:Aged; D015901:Angiography, Digital Subtraction / Q000379:methods; D002533:Cerebral Angiography; D004621:Embolization, Therapeutic / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D033162:Incidental Findings; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000628:therapy*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D020769:Posterior Cerebral Artery / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D015607:Stents