This is the first organized book on complex, difficult and informative surgical cases submitted by specialists in neurosurgery from around the world. It will be a collection of difficult and complicated cases that were operated by eminent neurosurgeons. Each contributor will write one or two successful cases that he thinks were difficult and complex, and discuss the techniques and technologies used. This book is designed to carry the techniques, the knowledge and the experience of the surgically difficult and complex cases in the surgery of cerebrovascular diseases and brain tumors. The book includes two parts: cerebrovascular diseases and brain tumors. Each chapter is composed of 50 case reports written by world reknown neurosurgeons. A case report includes problem and tactics (of this case), case report (including history, operation, and postoperative course), and discussion and references (less than 10), all of which is followed by the comments from a neurosurgical specialist. The text is short and concise. Neuroimaging photographs and self-explanatory operative sketches are used to help readers better understand the content.