for the Korean HydroSoft Registry Investigators

BACKGROUND AND PURPOSE: Various modifications of detachable coils have been attempted to reduce recurrence rates in aneurysmal coil embolization and HydroSoft coil is one of them. The authors report their experience using HydroSoft coils in the treatment of cerebral aneurysms. MATERIALS AND METHODS: The present study is a prospective multicenter observational series of 127 aneurysms in 120 patients treated with HydroSoft coils. RESULTS: Ten centers participated in this study, and there were 92 (72%) unruptured and 35 ruptured aneurysms. Aneurysm volumes were 100 mm3 in 21 (17%) and 100 mm3 in 106 (83%) (mean, 56 mm3; range, 5–249 mm3). The average percentage length of HydroSoft coils detached in treated aneurysms was 67 % (range, 42%–100%). Immediate postprocedural angiography demonstrated complete aneurysm occlusion in 69 % (87/127 aneurysms), residual neck in 20 % (25/127), and residual sac in 12 % (15/127). Procedure-related adverse events occurred in 4.7 % (6/127 aneurysms), including procedural bleeding (5/127) and thromboembolism (2/127), and immediate procedure-related morbidity and mortality rates were 0.8 % and 0%. Conventional angiography or MRA follow-up was performed in 83 % (105/127) at 6 months after treatment (mean interval, 11 months; range, 6–24 months). The overall recanalization rate was 3 % (3/105 aneurysms; 2 major and 1 minor recanalizations). Progressio