• T Murakami, T Nishida, K Asai, Y Kadono, H Nakamura, T Fujinaka, and H Kishima.
• From the Department of Neurosurgery (T.M., T.N., K.A., Y.K., H.N., H.K.), Osaka University Graduate School of Medicine, Osaka, Japan.
• AJNR Am J Neuroradiol. 2019 Jul 1; 40 (7): 1191-1196.

Background And PurposeThe appropriate period of follow-up examinations after endovascular embolization for cerebral aneurysms using time-of-flight MR angiography is not well-known. We retrospectively investigated long-term results after endovascular embolization for unruptured cerebral aneurysms and evaluated the periods from embolization to recanalization and retreatment.Materials And MethodsBetween April 2006 and March 2011, one hundred forty-eight unruptured aneurysms were treated with endovascular coil embolization. Among them, we investigated 116 unruptured aneurysms, which were followed up for >5 years. Time-of-flight MR angiography was performed at 1 day, 3-6 months, 1 year after the procedure, and every year thereafter.ResultsThe mean follow-up period was 7.0 ± 1.4 years. Recanalization was observed in 19 (16.3%) aneurysms within 2 years. Among them, retreatment for recanalization was performed in 8 (6.8%) aneurysms. No recanalization was detected in any aneurysms that had been stable in the first 2 years after embolization. A larger maximum aneurysm size was significantly correlated with recanalization (P = .019).ConclusionsAneurysms in which recanalization was not observed within 2 years after endovascular coil embolization were stable during a mean follow-up of 7 years. This result may be helpful in considering the appropriate span or frequency of follow-up imaging for embolized cerebral aneurysms.© 2019 by American Journal of Neuroradiology.

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