Historically, three endorectal pull-through procedures have been performed. The Swenson procedure resects the aganglionic portion of the bowel through an abdominal incision, and the ganglionic portion is pulled-through the anus. In 1956, Duhamel performed the retrorectal pull-through technique, which requires a combined abdominal-perineal approach. And finally, the Soave endorectal pull-through resects the aganglionic portion, and the distal portion of the remaining normal bowel is pulled through the muscular sleeve of the rectum. The goals of the various pull-through procedures are to relieve obstruction by resecting the aganglionic segment, return the bowel to normal motility, and preserve function of the external anal sphincter. The timing and type of a pull-through procedure vary based on weight, infant health status, and surgeon preference. Correction typically occurs at 6 months of age or 9 kilograms.