A book that compiles symposia papers from the International Journal of Colorectal Disease on issues that are highly controversial and hotly debated. Each chapter of this book deals with aspects of colorectal disease or its management in which there is controversy and difference of opinion: restorative proctocolectomy with ileal reservoir, the screening, staging, and management of colorectal cancer, the use of lasers in the treatment of colorectal cancer, endosonography and proctography, fistula-in-ano, faecal incontinence, and surgical aspects of familial adenomatous polyposis. The contributions present expert opinion together with a commentary by a moderator who is an acknowledged authority in the field. The book is based on "symposia" which appeared over a period of 4 years in the International Journal of Colorectal Disease. In diesem Band werden umstrittene Problemkreise aus der Proktologie dargestellt, die in der gängigen Literatur kaum zu finden sind. Die Beiträge wurden aus der Zeitschrift "International Journal of Colorectal Disease" ausgesucht und zusammengestellt.