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Rectal bleeding following colorectal anastomosis is common but usually self-limited. Continuous hemorrhage is rare, and when it occurs, often requires further treatment. The most frequently used strategies for treatment of stapled anastomotic hemorrhage are clinical observation with or without blood transfusion, rectal packing, angiographic identification of the bleeding site with vasopressin infusion or embolization, and endoscopic eletrocoagulation. We report the case of a 49-year-old man with uncomplicated diverticular disease who was treated by laparoscopic sigmoidectomy, with double-stapled colorectal anastomosis. Six hours later, the patient presented intense rectal bleeding and was taken to the operation room for urgent colonoscopic examination. After complete removal of blood clots inside the rectum, a bleed localized at the anastomotic site was identified and submucosal peri-anastomotic injection of 10 ml adrenaline (1:200 000) in saline was performed with immediate bleeding control.