Ureteral stent

What it means

A ureteral stent is a soft, hollow tube, usually made of flexible plastic, that a doctor threads through the ureter to hold it open and let urine drain freely from the kidney down to the bladder. Both ends curl into a loose coil — one nestled inside the kidney's collecting system, the other inside the bladder — which keeps the tube from slipping out of place. It is a device, not a disease, and its presence on a scan is simply a record of a procedure that has already been done.

Why it appears on a CT or MRI report

On CT, a stent shows up as a thin, curving line of higher density running the length of the ureter, with its characteristic coiled ends visible in the kidney and bladder. The radiologist typically confirms it is in the expected position, running the correct path, and not kinked, migrated, or encrusted with new stone material. Because a stent is often placed to treat an obstruction, the same report frequently comments on whether the swelling in the kidney that originally justified the stent has improved.

What it usually means

Stents are placed for a variety of reasons: a kidney stone blocking the ureter, narrowing from scarring or a tumor pressing on the tube, or as a protective measure during or after certain surgeries to let the ureter heal without becoming blocked. They are considered a temporary device, typically left in place for days to a few months depending on why they were placed, and are removed or exchanged in a straightforward outpatient procedure. While in place, they do a good job of keeping urine flowing, though many people notice some bladder irritation, urinary frequency, or mild flank discomfort, particularly right after placement or during activity.

When to follow up

Stents need to be tracked and removed or replaced on the schedule your urologist sets, since a stent left in far longer than intended can become encrusted with mineral deposits or, rarely, harder to remove. If your scan report mentions a stent, confirm with your doctor that removal or exchange is planned for the expected time. Fever, worsening flank pain, visible blood in the urine beyond mild spotting, or an inability to urinate are reasons to seek prompt medical attention, as they can signal infection or a stent that has shifted out of position.

A plain-language way to picture it

Think of a ureteral stent like the small mesh scaffold used to prop open a narrowed blood vessel elsewhere in the body — except this one holds open a urine drainpipe instead. Both ends curl like the letter J to anchor themselves in place, one hooking into the kidney and the other into the bladder, so the tube stays put while it does its job of keeping the drain flowing.