Figure 1: (a) Plain computed tomography showing enlarged left kidney with perirenal stranding (collaterals) and a hyperdense area inside the left renal vein suggestive of thrombus, (b) postcontrast study showing a filling defect in the left renal vein (thrombus), (c) postcontrast study, 1 month after anticoagulation, showing patent renal vein and healthy kidney.