The rectosigmoid junction: are limits important?

The rectosigmoid junction (RSJ) is the limit between the sigmoid colon and the rectum. The limits of this transition zone have been a source of controversy. There are multiple definitions that aim to establish the beginning of the rectum. Some organizations propose the use of more than one definition. Generally, these definitions use either radiological markings, endoscopic measurements or anatomical landmarks. However, no consensus exists currently.