I have bladder cancer (pT2). I underwent percutaneous nephrectomy owing to bilateral hydronephrosis which was delaying chemotherapy. standing could not be done as there was no voiding control and after PCN urine was collecting from the kidneys in two bags. The bags were filling normally until yesterday when the left side bag stopped filling and urine started coming into the bladder giving me pain. I would be grateful to know the reason this is happening and how serious this is.