The HydroCoil Embolic System (HES; MicroVention, Aliso Viejo, CA, USA) was developed to improve the efficacy of endovascular treatment of cerebral aneurysms. The HES may reduce recurrences of aneurysms by allowing for increased packing density compared with platinum coils. We report our initial experience with the HES in the treatment of 31 patients with acute ruptured cerebral aneurysms. The HES is another safe and effective material for aneurysms embolization, which provided substantially improved volumetric packing of the aneurysm lumen.
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