Ultra Low Anterior Resection is a type of colectomy (that is, the surgical removal of a part of the bowel), where the sigmoid colon - the left section of the colon - which is the last section of the colon before it connects to the rectum, is wholly or partially removed along with most of the rectum. The remaining colon then joins directly to the anus. In some procedures an internal pouch may be created.
Other related medical terminology
Proctosigmoidectomy - removal of the sigmoid colon with part or all of the rectum.
Proctocolectomy - removal of the entire colon and the rectum.
Total Colectomy - removal of the entire colon.
Subtotal Colectomy - removal of a section of the colon, or all of the colon but without removing the rectum.