The type of ureteric reconstruction is chosen mainly by where the stricture is, how long it is, whether the surrounding ureter has a good blood supply, and how well the kidney functions. A short upper or mid-ureteric defect may be joined end-to-end. A lower ureteric stricture is often reimplanted into the bladder, sometimes with a psoas hitch or Boari flap to bridge a longer gap. Longer proximal strictures may be suitable for buccal mucosa graft ureteroplasty. Very extensive loss may require bowel substitution or, rarely, renal autotransplantation. The core principle is a healthy, well-drained, tension-free repair.

The reconstruction is planned from the defect, not from a favourite operation

Several operations can reconstruct the ureter, and modern open, laparoscopic and robotic approaches all use the same biological principles: remove or bypass badly scarred tissue, preserve blood supply, create a wide mucosa-to-mucosa channel without tension, stent the repair and drain the area while it heals.

1. Location of the stricture

Upper or mid ureter

A short defect can often be treated with ureteroureterostomy, where healthy ureter above and below the scar is reconnected. If the stricture is close to the kidney or involves complex proximal anatomy, pyeloplasty-type repair, ureterocalicostomy or graft augmentation may be considered.

Lower ureter

Distal strictures are commonly treated by ureteroneocystostomy – reimplanting the healthy ureter into the bladder. Because the lower ureter may have compromised blood supply after injury, reimplantation removes the unhealthy distal segment rather than relying on it.

2. Length of the defect

A short gap can be joined directly. A longer distal gap may require the bladder to be mobilised upward with a psoas hitch. A still longer mid-to-distal defect can be bridged with a Boari flap made from bladder wall. Long proximal strictures may be widened with buccal mucosa rather than replacing the entire ureter.

3. Tissue quality and blood supply

Length on a scan is only part of the story. Thermal injury, radiation, repeated ureteroscopy, urine leak and multiple previous operations can leave a longer segment poorly vascularised than it first appears. Healthy tissue must be reached before the reconstruction is joined, because a repair under tension or through ischaemic ureter is more likely to scar again.

4. Kidney function

Reconstruction is most valuable when the kidney has meaningful recoverable function. CT appearance, cortical thickness and a MAG3/DTPA renal scan may be used. When function is severely reduced, the balance between complex reconstruction, long-term drainage and nephrectomy becomes individual.

5. Previous operations and radiation

A patient who has already had reimplantation, Boari flap, pelvic radiation or several failed endoscopic procedures may not have the same tissue options as someone with a first short stricture. Buccal mucosa graft ureteroplasty has become particularly useful for selected long and redo strictures because it can augment the ureter while preserving its blood supply.

Common reconstructive options

Ureteroureterostomy

Healthy ureter is reconnected end-to-end. Best suited to short defects where the ends can meet without tension.

Ureteric reimplantation

The ureter is implanted into the bladder. Common for distal strictures.

Psoas hitch

The bladder is mobilised and fixed toward the affected side so the ureter reaches without tension.

Boari flap

A flap of bladder is tubularised to bridge a longer mid/lower ureteric gap.

Buccal mucosa graft ureteroplasty

The narrowed ureter is opened and augmented with oral mucosa. It is increasingly used for longer proximal/mid strictures, especially when removing the entire scar would create a large defect.

Ileal ureter or renal autotransplantation

These are reserved for extensive ureteric loss or very complex failed reconstructions. Bowel substitution carries metabolic and intestinal considerations; autotransplantation is a major vascular and reconstructive operation.

Tests used to make the decision

• CT urography with delayed images.
• Retrograde and/or antegrade pyelography to define exact length.
• Renal scan when differential kidney function or drainage is uncertain.
• Creatinine/eGFR and urine culture.
• Review of previous operation notes and radiation history.
• Cystoscopy/ureteroscopy in selected cases.

Can the surgical plan change during the operation?

Yes. Scar length and tissue perfusion can be different from preoperative imaging. Intraoperative ureteroscopy and fluorescence imaging with indocyanine green are sometimes used to identify the healthy ureter and blood supply. A surgeon may therefore consent the patient for a primary option and one or more backup reconstructions.

What to bring for consultation

• CT urography images.
• Renal scan if done.
• Retrograde/antegrade pyelography images.
• Creatinine/eGFR and urine culture.
• Prior ureteroscopy, stone, pelvic or abdominal surgery notes.
• Details of current stent/nephrostomy and previous reconstruction.

Why “ureteral rest” can improve planning

A ureter that has been chronically stented can look different from its unstented state, and inflammation may make the scar difficult to define. In selected complex cases, the stent is removed while drainage is maintained by nephrostomy. This period of ureteral rest can allow the true stricture to declare itself before reconstruction and may improve the surgeon’s ability to identify healthy tissue.

How bladder capacity affects distal reconstruction

Psoas hitch and Boari flap depend on using the bladder to bridge ureteric length. A small, poorly compliant or heavily irradiated bladder may not provide enough healthy mobile tissue for these techniques. In such cases, the reconstructive algorithm shifts toward alternative tissue substitution rather than simply making a longer bladder flap.

Why buccal graft ureteroplasty has changed the algorithm

Traditionally, a long proximal/mid-ureteric defect could push the surgeon toward bowel interposition or renal autotransplantation. Buccal mucosa graft ureteroplasty can augment a narrowed ureter while preserving its blood supply and avoiding complete replacement in selected patients. Contemporary multi-institutional series report high short- to mid-term success, but the evidence base is still smaller than for established distal reimplantation procedures and long-term surveillance remains important.

Open, laparoscopic or robotic: how is the approach chosen?

The reconstructive principle should be the same regardless of access. Robotic surgery can provide magnified dissection and precise suturing with smaller incisions, while open surgery remains valuable in very complex reoperative fields or where robotic expertise is unavailable. The best approach is the one that allows safe exposure, healthy tissue and a tension-free repair for that specific patient.

The operation is chosen from the defect, not from a menu

Terms such as Boari flap, psoas hitch or buccal graft are descriptions of how the surgeon solves a specific anatomical problem. The key measurements are the length of unhealthy ureter after scarred tissue is excluded, whether the remaining ends have reliable blood supply and whether the bladder or other tissue can reach without tension. The same CT report can therefore lead to different operations once the true viable ureter is assessed.

FAQs

Related reading

• Ureteric Stricture: Can It Damage the Kidney?
• What If a Ureteric Stent Does Not Fix the Blockage?
• Recovery After Ureteric Reconstruction
• Can Ureteric Stricture Come Back After Surgery?
• Ureteric Stent: Why It Is Placed
• Urologist in Latur

References

• European Association of Urology. EAU Guidelines on Urological Trauma: Ureteral Trauma, 2026 https://uroweb.org/guidelines/urological-trauma/chapter/urogenital-trauma-guidelines
• Bourillon A, Peyronnet B, McGuire BB, et al. Ureteral stricture: current treatment algorithm and key surgical principles in the robotic upper urinary tract reconstruction era. World J Urol. 2026;44(1):102. doi:10.1007/s00345-025-06181-4.
• Fuller TW, Daily AM, Buckley JC. Robotic Ureteral Reconstruction. Urol Clin North Am. 2022;49(3):495-505. doi:10.1016/j.ucl.2022.05.002.
• Chao BW, Raver M, Lin JS, et al. Robotic Buccal Mucosa Graft Ureteroplasty: A Decade of Experience From a Multi-institutional Cohort. Urology. 2025;197:174-179. doi:10.1016/j.urology.2024.11.059.
• Bourillon A, McGuire BB, Pinar U, et al. Robot-assisted Buccal Mucosa Graft Ureteroplasty for Ureteral Stricture: A European Multicenter Case Series. Eur Urol Open Sci. 2026;83:166-172. doi:10.1016/j.euros.2025.12.007.