For this Centennial Congress, we have several designated topics of Special Programs, Consensus Meetings, and Educational Sessions :case-based learning, in addition to ten Symposium topics, five Workshop topics, eight Video Symposium topics, and 25 Surgical Forum topics (poster or poster discussion), the last which has gained much attention recently and has been added as a new program. We are also calling for a wide range of other topics which do not fall under any of these categories to be included as Free Papers & Videos (poster or video).