During cancer treatment, a tumor or nearby tissue can press on and block the tube that carries urine (the ureter). When this happens, urine made by the kidney cannot drain down to the bladder and instead backs up in the kidney. If the blockage continues, kidney function can decline and kidney blood values may worsen, so a procedure is often needed to reopen the pathway. Two common options are a percutaneous nephrostomy (PCN) and a ureteral stent.
A percutaneous nephrostomy is a tube placed directly into the kidney through the skin of the back, draining urine into a bag outside the body. A ureteral stent, by contrast, is a thin tube passed through the bladder into the ureter so that urine can flow along its normal internal route. The two devices share a similar goal but use different drainage paths.
Even after a stent is placed, the nephrostomy tube is sometimes left in for several more days rather than removed right away. The idea is to keep the nephrostomy as a backup drain until the team can confirm that the newly placed stent is actually moving urine well. If the tube were removed on the assumption the stent works, and the stent then fails to do its job, the kidney could swell again. So when a doctor says, 'let's keep it a little longer,' it is often a cautious, sensible decision.
A nephrostomy tube is usually connected to a multi-branch connector (a three-way) or a drainage bag. A small amount of leakage at a connection point is not rare, but 'a little leaking is possible' does not mean 'heavy leaking is fine.' Leakage can increase when the tube kinks or clogs and urine finds another gap, when a connection loosens, or when the tube shifts position. Frequent leaking, a sudden increase in the amount, or a tube that seems about to come out can become an emergency, so the hospital should be told.
After a stent is placed, a feeling that the bladder never fully empties, frequent urges, faintly bloody urine, and sudden urgency that is hard to hold are common irritation symptoms. They usually settle over time, but when they are severe enough to disrupt sleep or lead to leaking accidents, it is worth reporting them to the clinic or treating department rather than enduring them. Medication that calms the bladder or other measures may help, and the team can also check whether something else, such as an infection, is behind the symptoms.
At home, securing the tube and connections so they are not loose, keeping the bag lower than the kidney so urine does not flow backward, and having spare connector parts on hand can make sudden leaks less alarming. A fever, redness, swelling or pain around the tube, cloudy or foul-smelling urine, or a sudden drop in urine output can signal infection or blockage, so it is safest to seek care without delay.
This article is for general information only and does not replace an individual patient's diagnosis or treatment. How devices should be managed, and how to interpret symptoms, can differ from person to person, so please discuss any questions or worrying symptoms with your own care team.