Article Text

Download PDFPDF
P-020 Follow-up outcome of re-embolization in recanalized aneurysms after coiling: further recurrence rate and related risk factors
  1. Y Cho,
  2. H Kang,
  3. M Han
  1. Radiology, Seoul National University Hospital, Seoul, Korea, Republic Of


Objective It is well known that coiled aneurysms may recanalize over time, making follow-up evaluation mandatory. However, midterm and long-term outcome of re-embolization in recurred aneurysms after coil embolization has not been adequately investigated. We generated estimates of the re-treatment outcomes during follow-up monitoring, analyzing risk factors related to the further recanalization.

Methods A total of 133 aneurysms in 129 patients were retrospectively reviewed, each subjected to re-embolization for major recanalization after initial coil embolization, and to midterm and extended monitoring after the re-treatment. Cumulative medical records and radiologic data were assessed. Further recurrence rates and related risk factors were assessed using binary logistic regression analysis.

Results A total of 47 aneurysms (35.3%) displayed recanalization at 6 months postembolization, with 17 and 30 instances of minor and major recanalization, respectively. Multivariate analysis indicated that posterior circulation (HR=6.129; p=0.010), incomplete occlusion at time of second coiling (HR=9.975; p=0.001) and large-sized aneurysm (>7 mm) at time of fist coiling (HR=13.598; p<0.001). In 86 aneurysms showing complete occlusion at mid-term, 76 were further evaluated (≥12 months), displaying 18 aneurysms (23.7%) of delayed recanalization (minor, 14; major, 4) during a follow-up of 230.1 aneurysm-year (annual delayed recanalization rate: 7.8% aneurysm-year). Out of 15 aneurysms with minor recanalization at 6 month and with extended follow-up ((≥12 months), progression to major recanalization was observed in 6 aneurysms (40.0%) during a follow-up period of 44.0 aneurysm-year (annual progression rate: 13.6% aneurysm-year).

Conclusions Majority of re-coiled aneurysms (64.7%) displayed complete occlusion at 6 month follow-up. However, posterior circulation, incomplete occlusion at time of second coiling, and large aneurysm size before the treatment were predisposed to further recanalization. Mid-term recanalization rate in the re-embolized aneurysms seems to be higher than initial aneurysm.

Disclosures Y. Cho: None. H. Kang: None. M. Han: None.

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.