The practice of endovascular neurosurgery is becoming more and more common. Endovascular techniques have increased our understanding of cerebrovascular diseases, and evolving technologies have expanded our means of treatment. This increasing complexity requires a neurosurgeon to increase clinical capacity and develop professional knowledge. However, narrow clinical focus also breeds prejudice, competition and controversy. These reactions may be positive when they stimulate innovation, improve patient outcomes, cause suspicion and hinder progress. Now these factors are more common in neurovascular surgery. Endovascular technology has become a legitimate alternative to open neurosurgical technology. In this textbook, we focus on brain AVMs, which is the last difficulty of endovascular neurosurgery. Neurosurgeons, endovascular neurosurgeons and interventional neuroradiologists are invited to publicly express their views and practices. The authors are very famous in the world and their contributions are very valuable. We believe in "the more you express your skills, the more experienced you become and the closer you get the excellence". This book provides many disruptive innovations and completely changes our previous understanding of brain AVMs. Three sections are included in this book: AVM of the brain is one type of systemic vascular abnormality; endovascular therapy of AVM of the brain; pathophysiology and pathogenesis of AVM and its surgical management and radiotherapy. We also provide a chapter of development of endovascular neurosurgery in China, which the readers may be interested in.