PT  - JOURNAL ARTICLE
AU  - T. Murakami
AU  - T. Nishida
AU  - K. Asai
AU  - Y. Kadono
AU  - H. Nakamura
AU  - T. Fujinaka
AU  - H. Kishima
TI  - Long-Term Results and Follow-Up Examinations after Endovascular Embolization for Unruptured Cerebral Aneurysms
AID  - 10.3174/ajnr.A6101
DP  - 2019 Jul 01
TA  - American Journal of Neuroradiology
PG  - 1191--1196
VI  - 40
IP  - 7
4099  - http://www.ajnr.org/content/40/7/1191.short
4100  - http://www.ajnr.org/content/40/7/1191.full
SO  - Am. J. Neuroradiol.2019 Jul 01; 40
AB  - BACKGROUND AND PURPOSE: The 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 METHODS: Between 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.RESULTS: The 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).CONCLUSIONS: Aneurysms 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.BAbasilar arteryCOcomplete obliterationRAresidual aneurysmRNresidual neck