Major advances have recently been made in our understanding of Ovarian Hyperstimulation Syndrome (OHSS): improving classification, recognizing primary and secondary risk-factors, manipulating and monitoring ovarian stimulation, handling risky situations, and elucidating the underlying pathophysiologic mechanisms of the syndrome. As such, all health care professionals working in reproductive medicine should be acquainted with the theoretical and practical aspects of how to deal with this syndrome, both from a prophylactic point of view and once it has developed. Focusing on the clinically relevant aspects of the syndrome, this text is built on acquired knowledge but minimizes speculative considerations in order to leave room for some intelligent ignorance and contention. Well illustrated with appropriate diagrams showing biologic mechanisms, procedural algorithms, sonographs and radiological images, at the end of each clinical chapters there is also a list of frequently asked questions, with appropriate answers, to help expand and elaborate difficult practice problems. With its definitions, classifications and treatment algorithms, Ovarian Hyperstimulation Syndrome will be highly useful to general gynecologists, both in practice and training. Moreover, as there is a consistent view of OHSS in different parts of the world, the book will also have global appeal to all reproductive physicians and support personnel working in IVF/ICSI units.