Nowadays, we are dealing more frequently with the entity of large intestine polyps, as endoscopy and bowel cancer screening programmes are rapidly expanding. Often a single polyp is involved, but more complex situations are also encountered, including the well-defined pattern of polyposis. These situations can fall into a gray area, not only for diagnosis, but also for the correct treatment and follow-up. New developments in pathophysiology and treatment options are leading to new questions. This handbook aims to offer a integrated approach for all physicians (doctors) who deal with these issues, by presenting up-to-date discussion from genetics through treatment, to implications of genetic counseling. It will also help specialists to offer more "evidence-based" treatments, by implementing the best clinical individual judgement informed by the best current scientific evidence.