This book provides recent progress of neuroendovascular surgery, which is a minimally invasive treatment of cerebral aneurysms. Great advances have been made in the techniques, devices and large randomized clinical trials showing striking therapeutic benefit for cerebral aneurysms. The treatment of cerebral aneurysms has also seen substantial evolution, increasing the number of aneurysms that can be treated successfully with minimally invasive therapy. In the 17 chapters, authors introduce the techniques, devices, device structures and therapeutic concepts.