Rationale and aim

In patients with aneurysmal subarachnoid hemorrhage (aSAH), endovascular coiling and neurosurgical clipping have traditionally been the primary treatments for ruptured aneurysms. In the past decade, new intra-saccular devices have emerged, allowing for the treatment of more complex aneurysms. These devices may reduce procedure time compared to conventional coiling, potentially decreasing the risk of thromboembolic complications. While published occlusion rates for the WEB device differ from standard coiling, the rates of adequate occlusion (modified Raymond Roy classification 1 and 2) appear similar. Currently, the use of intra-saccular devices for aSAH varies widely, particularly in the Netherlands, making it an ideal setting to investigate the potential benefits of this innovative treatment.