Objective The stent-assisted coil embolization of intracranial aneurysm has been used widely. This study aimed to investigate the effect of stent implantation on the nonatherosclerotic parent artery with cerebral aneurysms. We evaluated the changes in the lumen and the related factors following stent-assisted coil embolization.

Methods This study included 99 aneurysms of 97 patients harboring unruptured distal internal carotid artery (ICA) who were treated with a single stent and underwent more than 1 session of follow-up conventional angiography (mid-term follow-up only, 70; mid-term and long-term follow-up, 29) between January 2009 and April 2014. The luminal narrowing point was measured by using a local thickness map (Plug-in of IMAGE J).

Results Stent-assisted coil embolization caused dynamic intimal hyperplasia of parent artery, about 82% of the diameter on average after 8 months, which was reversed as 91% after 25 months. In addition, over 40% of luminal narrowing was noticed in 2 (7%) of the 29 patients and all spontaneous reversed without additional management in follow-up. Most of intimal hyperplasia present diffuse type.

Conclusion Intimal hyperplasia after aneurysm treatment is dynamical change and may be a spontaneously reversible event. Routine management of intimal hyperplasia may not cause adverse events that require additional treatments.

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Abstract E-096 Figure 1

Disclosures Y. Kim: None. S. Baik: None. S. Lee: None. G. Song: None.