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Abstract Introduction Diverticular disease of the colon is a common benign condition. The majority of patients with diverticular disease are asymptomatic and are managed non-operatively, however complications such as perforation, bleeding, fistulation and stricture formation can necessitate surgical intervention. A giant colonic diverticulum is defined as a diverticulum larger than 4 cm in diameter. Despite the increasing incidence of colonic diverticular disease, giant colonic diverticula remain a rare clinical entity. Case presentation This is the first reported case of laparoscopic-assisted resection of a giant colonic diverticulum. We discuss the symptoms and signs of this rare complication of diverticular disease and suggest investigations and management. Reflecting on this case and those reported in the literature to date, we highlight potential diagnostic difficulties and consider the differential diagnosis of intra-abdominal gas-filled cysts. Conclusion The presence of a giant colonic diverticulum carries substantial risk of complications. Diagnosis is based on history and examination supported by abdominal X-ray and computed tomography findings. In view of the chronic course of symptoms and potential for complications, elective surgical removal is recommended. Colonic resection is the treatment of choice for this condition and, where possible, should be performed laparoscopically.