CT diagnosis of primary torsion of greater omentum.

The etiology of primary volvulus of the omentum in the absence of other intraabdominal pathology remains obscure. Abdominal pain and tenderness are always present. Computed tomography demonstrates an abdominal mass composed of fatty and fibrous folds. Characteristic for a torsion is the concentric distribution of the fibrous folds at the site of torsion.