Matthew Philp, MD, Professor of Clinical Surgery at the Lewis Katz School of Medicine at Temple University, offered insight to HealthCentral about loop colostomies. A colostomy is a surgical procedure that severs the colon and brings part of it out through an opening in the abdominal wall (called a stoma). A loop colostomy is temporary and is performed when a person’s colon needs time to rest and heal from an infection or injury.