I have bladder cancer (pT2). Bilateral hydronephrosis delayed chemotherapy for which percutaneous nephrostomy was done. Stenting could not be done as there is no bladder control and after PCN urine drains from the two kidneys into two bags. My bags were filling up normally until yesterday when the left side bag stopped filling. Urine is filling the bladder and I am feeling pain. I would be grateful to know what might have caused the bag to suddenly stop filling and how serious this is.