The case of a 65 year old woman presented symptoms of acute abdomen secondary to full torsion of the greater omentum is presented, diagnosed preoperatively by CT, thus avoiding emergency surgery due to good evolution with conservative attitude. This disease is a rare cause of abdominal pain, but we include it in the differential diagnosis of acute abdomen. Currently imaging techniques allow preoperative diagnosis to avoid emergency surgery, and maintain an expectant attitude to act on patient evolution. In our case, we chose conservative attitude and the patient is asymptomatic 7 months later.