This compact book provides step-by-step guidance in the approaches and techniques developed and currently used at the authors’ center in Düsseldorf for the treatment of a variety of aneurysms. All of the described procedures are minimally invasive and of proven efficacy. In order to assist the reader in fully comprehending all aspects of the techniques, they are illustrated through clear graphics instead of complex photos and radiologic imaging. While the rapid development of endovascular treatment means that it is no longer necessary to employ microsurgery for difficult and hidden aneurysms, proficiency in microsurgery remains essential. For example, full mastery of microsurgical techniques is vital in order to treat middle cerebral and peripheral aneurysms efficiently and with minimal trauma. Minimal invasiveness and optimal cosmetic results have become critically important in enabling the microsurgical method to compete with the endovascular method.  In documenting “tried and tested� procedures, this book will be invaluable for both established neurosurgeons and residents in neurosurgery.