Axial CT arterial phase image shows hypoattenuating left flank mass corresponding to the wandering spleen. The splenic pedicle is twisted (white arrow), giving a whirled appearance that confirms the diagnosis of torsion. The central structure of the whirl is the splenic artery with thrombus inside (black arrow), and the peripheral part corresponds to the vein with thrombus (confirmed in venous phase images, not shown).