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A defunctioning stoma is used to alleviate the consequences of anastomotic leakage after low anterior resection for rectal cancer. A loop ileostomy is often preferred but may lead to dehydration and kidney injury. Here, we present a case series for an alternative: the left-sided loop colostomy. A convenience sample of four patients underwent robotic low anterior resection for rectal cancer. A complete splenic flexure mobilization and a total mesorectal excision were performed. To defunction the anastomosis, the redundant left colon was brought up to a stoma site in the left iliac fossa and matured as a loop colostomy. Two patients experienced minor stoma leaks and one also had a small prolapse, while all patients had their colostomies reversed on average 7 months after surgery without complications. There were no dehydration episodes and creatinine levels remained within baseline levels at end of follow-up (on average 18 months).