Relatively enlarged, non-opacified right renal vein denoting renal vein thrombosis with extension of the thrombus to the right renal vein- IVC junction. Associated relative enlargement and mildly decreased and heterogenous parenchymal enhancement of the right kidney with significant right perinephric and retroperitoneal fat stranding and free fluid.
Minimal free fluid is also seen in the pelvis.
Markedly atretic left renal vein with formation of multiple collaterals.