(3)Postrenal failure Stone or tumor Bilateral obstruction Renal pelvises hydropsy Increased renal interstitial pressure increased intracapsular pressure→GFR!↓ suddenly anuria and azotemia22 increased intracapsular pressure →GFR↓↓ Renal pelvises hydropsy increased renal interstitial pressure suddenly anuria and azotemia Stone or tumor →Bilateral Obstruction (3) Postrenal failure