What Is a Ureteroneocystostomy and Why Is It Performed?

A ureteroneocystostomy is a surgical procedure that reconnects the ureter, the tube carrying urine from the kidney to the bladder, to a new site on the bladder wall. The name breaks down simply: “uretero” (ureter), “neo” (new), “cystostomy” (bladder opening). Surgeons perform it when the original connection between the ureter and bladder is damaged, obstructed, or failing to prevent urine from flowing backward toward the kidney. The procedure is one of the most common reconstructive operations in urology, performed on everyone from infants with congenital urinary reflux to adults recovering from surgical injuries or receiving a transplanted kidney.

Why the Normal Ureter-Bladder Connection Matters

The spot where the ureter meets the bladder is not just a hole. It is a specialized junction that acts as a one-way valve, allowing urine to flow down into the bladder while preventing it from surging back up toward the kidney when the bladder contracts. The ureter passes through the bladder wall at an angle and travels through a short tunnel beneath the bladder’s inner lining before opening into the bladder. When the bladder fills and pressure rises, that tunnel compresses the ureter shut, creating a natural anti-reflux mechanism.¹

When this valve fails or the ureter is damaged, urine can flow backward, a condition called vesicoureteral reflux (VUR). Reflux repeatedly washes bacteria-laden urine from the bladder up toward the kidney, raising the risk of kidney infections and, over time, permanent kidney scarring. Ureteroneocystostomy reconstructs the junction so that valve mechanism works again. The fundamental surgical principles have not changed despite decades of technological progress: the reimplanted ureter needs a long enough tunnel beneath the bladder lining, adequate blood supply, and a connection free of tension.¹

The Main Reasons Surgeons Perform It

The procedure covers a surprisingly wide range of clinical situations. The most common fall into three broad categories.

Vesicoureteral Reflux in Children

This is the classic indication. Many children are born with a ureter that enters the bladder too steeply or with too short a tunnel, so the anti-reflux valve never works properly. Mild reflux sometimes resolves on its own as a child grows, but surgery becomes the recommendation when reflux is severe, causes repeated kidney infections despite preventive antibiotics, or threatens kidney function. In a large cohort of over 3,700 children treated at a single center, factors that predicted the need for surgery included female sex, older age at presentation, bilateral reflux, high-grade reflux, and detection of hydronephrosis before birth.² The primary goal is straightforward: prevent kidney infections that could cause lasting damage.³

Ureteral Injury During Other Surgery

The ureter runs close to several organs in the pelvis, and it can be accidentally clipped, cut, or kinked during gynecologic, colorectal, or vascular operations. Pelvic surgery is the most common cause of iatrogenic (surgery-caused) ureteral injury.⁴ When the lower part of the ureter is damaged, a ureteroneocystostomy reconnects the remaining healthy ureter directly to the bladder. A case series of 11 patients who sustained lower-third ureteral injuries during gynecologic surgery were successfully treated this way using laparoscopic reimplantation.⁵

Kidney Transplantation

Every transplanted kidney needs its ureter connected to the recipient’s bladder. This is technically a ureteroneocystostomy, and the technique used can influence complication rates. At many transplant centers, the extravesical Lich-Gregoir approach has become the standard method for this step.⁶ In one study comparing two techniques in 75 living-donor transplant recipients, the Lich-Gregoir group experienced symptomatic reflux in about 9% of cases.⁷

How the Surgery Is Done

The basic idea is the same in every version: detach the ureter from its current (faulty or damaged) location, create a new opening in the bladder wall, draw the ureter through a tunnel beneath the bladder lining, and stitch it in place. A thin internal stent is usually left in the ureter temporarily to keep it open while healing occurs. The differences between techniques come down to how the surgeon accesses the bladder and creates that tunnel.

Intravesical Techniques

In intravesical approaches, the surgeon opens the bladder and works from the inside. The two best-known versions are the Cohen technique and the Politano-Leadbetter technique. In the Cohen method, the ureter is pulled across the back wall of the bladder through a new submucosal tunnel and brought out near the opposite ureter’s opening. In the Politano-Leadbetter approach, the ureter is routed through a new tunnel to emerge at a position above its original opening, maintaining a more natural course for the ureter as it enters the bladder.⁸ Both methods aim for a tunnel-to-ureter-diameter ratio of roughly 5:1, meaning the tunnel is about five times as long as the ureter is wide, which provides enough compression to prevent reflux.⁹

The Politano-Leadbetter technique is more technically demanding but leaves the ureter entering the bladder in a more anatomically natural direction.⁸ This distinction matters mainly when someone might later need a cystoscope passed up the ureter; the Cohen cross-trigonal approach can make future catheterization of the reimplanted ureter tricky because its opening has moved to the opposite side of the bladder.

Extravesical Techniques

The Lich-Gregoir technique works from outside the bladder. The surgeon cuts through the outer muscle layer of the bladder wall to expose the inner lining, lays the ureter into a trough along the bladder surface, and closes the muscle layer over it, creating a tunnel without ever opening the bladder. Because the bladder is not opened, recovery tends to be faster and there is less bladder irritation. One concern specific to bilateral extravesical reimplantation (both sides done at once) is temporary difficulty urinating afterward. In a study at a Canadian center, urinary retention developed in about 8% of children who had both ureters reimplanted using this technique, though all recovered within a week with conservative management.¹⁰

When Extra Steps Are Needed

Sometimes the gap between the healthy ureter and the bladder is too large for a simple reimplantation. This happens with injuries or disease higher up the ureter, or when a segment must be removed. Surgeons have developed additional maneuvers to bridge the distance.

A psoas hitch involves stitching the bladder to a muscle in the pelvis (the psoas muscle), pulling the bladder upward so it sits closer to the remaining ureter. This reduces the distance the reimplanted ureter needs to span and prevents tension on the new connection.¹¹ When even more length is needed, a Boari flap fashions a tube-shaped extension from the bladder wall itself, creating a bridge that the ureter can be sewn to. Both techniques can be performed with robotic assistance.¹² In one series of 34 adults who underwent robot-assisted ureteroneocystostomy, about three-quarters had a straightforward reimplantation while roughly a quarter required a psoas hitch to reach.¹³

Open Surgery Versus Robotic and Laparoscopic Approaches

Open surgery through a lower abdominal incision was the only option for decades. It remains the most studied approach and serves as the benchmark, with success rates consistently above 95% for reflux correction. Robotic and laparoscopic methods have gained ground steadily. Comparing the two head to head, a single-center retrospective study found that stricture recurrence was similar between open and robotic reimplantation (roughly 7% versus 9%), but the robotic group had significantly less blood loss and a much shorter hospital stay, with a median of 3 days compared to 11 days for the open group.¹⁴

In children specifically, a case-matched comparison found that robotic intravesical reimplantation led to shorter catheter drainage, fewer bladder spasms, and shorter hospital stays than the open intravesical approach, with no difference in overall success rates.¹⁵ Pain outcomes also appear to favor robotic surgery: one study found that 57% of children in the robotic group had mild or no pain postoperatively compared to 27% in the open group, and only 9% in the robotic group experienced severe pain versus 45% in the open group.¹⁶

Robotic surgery does come with longer operative times and requires specialized equipment that not all centers have. For straightforward cases, the choice between open and robotic often depends on surgeon experience and institutional resources rather than any clear superiority of one approach over the other.

Endoscopic Injection as an Alternative

Not every child with reflux needs a full reimplantation. A less invasive option involves injecting a bulking material (most commonly a combination of dextranomer and hyaluronic acid) beneath the ureteral opening during cystoscopy. The injected material creates a small mound that props the ureter closed, mimicking the anti-reflux valve. The appeal is obvious: it is a quick outpatient procedure with shorter operative time, less pain, and lower upfront cost than reimplantation surgery.¹⁷

The trade-off is durability. In a multicenter review spanning 12 years, reimplantation resolved reflux in about 84% of ureters compared to 65% for the injection approach, with the gap widening considerably for the most severe grades. For grade 5 reflux, reimplantation resolved the problem in roughly 82% versus 40% for injection.¹⁸ A prospective randomized study found a somewhat narrower gap, with 80% resolution after a single injection versus 94% after Lich-Gregoir reimplantation, a difference that did not quite reach statistical significance in that particular trial.¹⁹ Endoscopic injection also carries a higher redo rate, meaning more children end up needing a second or third procedure.¹⁷

For low-to-moderate reflux, injection can be a reasonable first step. For high-grade or bilateral reflux, most urologists still lean toward reimplantation because of its higher one-and-done success rate.

What Can Go Wrong

No surgery is complication-free, and ureteroneocystostomy has a well-characterized set of potential problems.

Obstruction at the new connection point is one of the more worrisome early complications. It can result from swelling, a blood clot, or kinking of the ureter during reimplantation.²⁰ Decreased ureter movement after surgical handling can also temporarily slow drainage, though this almost always resolves on its own. In a long-term analysis of children followed for up to 12 years after reimplantation, post-operative obstruction at the junction occurred in about 7.5% of ureter units, and it was seen exclusively after the Politano-Leadbetter technique, with all cases emerging within the first eight months.²¹

Persistent reflux, where urine still flows backward despite the surgery, occurs in a small minority. In a review of 965 children who underwent open reimplantation, about 6% had persistent reflux on follow-up imaging. Of those, roughly 72% saw the reflux resolve on its own over a median of about 20 months, and only one patient needed a repeat reimplantation.²² About 13% of patients with persistent reflux developed a febrile urinary tract infection during follow-up.²²

Children with certain genetic conditions may face higher risks. Williams-Beuren syndrome, for instance, involves a deficiency in elastin that affects tissue recoil throughout the body, including the ureter. A case report documented bilateral ureteral obstruction and acute kidney failure after reimplantation in a child with this syndrome, likely because the ureters could not spring back to their normal shape after being handled during surgery. The authors recommended placing stents in both ureters at the time of surgery for these patients.²⁰

Long-Term Kidney Function

One of the biggest concerns parents have is whether their child’s kidney will be harmed by the surgery or by the reflux that preceded it. The reassuring finding from the available data is that reimplantation stabilizes kidney function rather than improving or worsening it. In a study of 28 children who had kidney scans before and after surgery, relative kidney function did not change in a meaningful way, averaging about 20% before surgery and 20% afterward over a follow-up period of about two years.²³ The takeaway is that surgery stops further damage but does not reverse scarring that has already happened, which is why urologists push for timely intervention before the kidney takes too much of a hit.

Duplex Kidneys and Ectopic Ureters

Some people are born with a duplex collecting system, meaning one kidney has two separate drainage pathways, each with its own ureter. Frequently the extra ureter opens in the wrong place entirely, draining into the vagina, urethra, or elsewhere rather than the bladder. The result is often continuous dribbling incontinence that no amount of pelvic floor exercises will fix. Ureteroneocystostomy can reroute the misplaced ureter into the bladder where it belongs.

The decision hinges on whether the affected part of the kidney still works. If the upper pole of the kidney (the part drained by the ectopic ureter) has adequate tissue thickness, reimplanting the ureter preserves that kidney tissue and resolves the incontinence without removing anything.²⁴ If the kidney segment is too damaged to salvage, the usual approach is to remove that segment along with its ureter rather than reimplanting a tube that drains a functionless piece of tissue.

A 35-year follow-up of patients with duplex kidneys and ectopic ureters treated by antireflux reimplantation found no reports of persistent dribbling incontinence, and imaging showed that upper-pole hydronephrosis improved or remained stable in all patients.²⁵ These are complex anatomical situations, and surgeons sometimes recommend exploratory surgery first to map the exact anatomy before committing to a plan.²⁴

How Surgeons Choose a Technique

There is no single “best” version of this operation. The choice depends on several patient-specific factors: the child’s age, whether one or both sides need correction, the severity of reflux, whether the bladder itself functions normally, and the family’s preferences. Bowel habits also matter, because chronic constipation puts extra pressure on the bladder and can undermine even a technically perfect reimplantation.³

For unilateral reflux (one side), many surgeons favor the extravesical Lich-Gregoir approach because it avoids opening the bladder and typically has a smoother recovery. For bilateral cases, some shift to an intravesical technique or accept the small risk of temporary voiding difficulty that comes with bilateral extravesical work.²⁶ In adults with ureteral strictures or injuries, the degree of ureteral loss dictates whether a straightforward reimplantation suffices or whether a psoas hitch or Boari flap is needed to close the gap.

The evidence is clear that this is not a one-size-fits-all procedure. It is a family of closely related operations unified by the same goal: creating a functioning, reflux-free connection between the ureter and the bladder. The specific version a surgeon recommends reflects the anatomy on the table, the clinical scenario that brought the patient to the operating room, and the tools available at that center.