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Intraoperative Urologic Consultation

Intraoperative urologic consultation is the urologist's response to suspected or confirmed iatrogenic urinary tract injury (IUTI) or trauma recognized during another specialist's operation. The call typically comes from a colorectal, gynecologic, general, vascular, or obstetric surgeon asking for immediate assessment of the ureter, bladder, urethra, or kidney — with the patient under anesthesia, the field open, and a decision window measured in minutes. The goals are the same every time: immediate recognition, appropriate repair or temporization, preservation of renal function, and a durable plan that prevents the patient from returning to our clinic as a delayed-diagnosis disaster.[1][2]

The role has shifted over the last three decades. The old paradigm in which the primary surgeon managed urinary complications has largely given way to consultant-led repair: in one colorectal series, 78% of intraoperatively diagnosed ureteral injuries were repaired by a consulting urologist, and long-term success of intraoperative bladder repair reaches 98.4% when performed by a consultant urologist.[2] The reconstructive urologist's presence at the moment of injury is now considered fundamental.[2]

This article is the operational guide to that consultation — when to come, what to bring, how to recognize injury, how to repair it, and when to temporize. For the specific non-urologic operations that generate these injuries, see the nested Procedures Causing GU Injury reference. For organ-specific trauma management outside the iatrogenic context, see Ureteral Trauma, Bladder Trauma, Renal Trauma, PFUI, and GU Injury Overview.

When to Get the Call​

Urologic consultation should be obtained in the following situations:[2]

  • Suspected or confirmed ureteral injury during pelvic or abdominal surgery
  • Bladder injury requiring complex repair or involving the trigone / ureteral orifices
  • Urethral injury during pelvic surgery (rectal resection, taTME)
  • Renal vascular injury or significant renal trauma
  • Uncertainty about urinary tract anatomy or extent of injury
  • Need for intraoperative diagnostic maneuvers — cystoscopy, retrograde pyelography, indigo-carmine assessment of ureteral jets

A low threshold is appropriate. Delayed-diagnosis outcomes are worse than intraoperative recognition across every category of IUTI (see the Timing section).

What to Bring​

When the call comes from a field you don't routinely work in, arrive prepared:

  • Cystoscope (flexible and rigid) with light cord and camera
  • Guidewires — hydrophilic (Sensor, Glidewire) and stiff-tip (Amplatz)
  • Ureteral catheters — 5-Fr open-ended for retrograde pyelogram; 6-Fr cone tip
  • Double-J ureteral stents in a range of sizes (4.7-Fr × 22, 24, 26; 6-Fr for edematous ureters)
  • Indigo carmine (40 mg slow IV) or methylene blue for diagnostic perfusion
  • Absorbable suture: 4-0 / 5-0 Vicryl or PDS for ureter; 2-0 / 3-0 for bladder
  • Closed-suction drain (10-Fr round or 15-Fr flat)

Orient yourself to the field before scrubbing: where is the injury, what is the patient's stability, what has the primary team already done, and has anything been transected, clipped, or tied?

General Repair Principles​

Regardless of organ injured, five principles apply:[4][2]

  1. Choose repair by injury location. Ureteral injury above the pelvic brim favors ureteroureterostomy; below, ureteroneocystostomy. Bladder dome injury is managed differently than trigonal injury.
  2. Debride devitalized tissue. Thermal, crush, and delayed-recognition injuries extend beyond the visible margin — trim back to viable, well-perfused tissue.
  3. Preserve the adventitia. Over-mobilization strips periureteral blood supply and converts a repairable injury into a necrotic segment.
  4. Tension-free, watertight, mucosa-to-mucosa anastomosis with spatulated ends and fine absorbable suture.
  5. Stent, drain, and image. Double-J ureteral stent for every ureteral repair, retroperitoneal drain near every anastomosis, and delayed cystogram / contrast study before removing the catheter or stent.

Damage Control — "Drain Now, Fix Later"​

In the hemodynamically unstable patient, when urologic expertise is limited, or when the injury is discovered in a contaminated field, do not attempt definitive repair. Instead:[4][2]

  • External urinary drainage — percutaneous nephrostomy for upper tract, large-bore Foley ± SPT for lower tract
  • Ligate the proximal ureteral stump if the ureter is transected — prevents uroperitoneum
  • Wide retroperitoneal or pelvic drain
  • Definitive repair in 5–7 days once the patient is resuscitated and the field has been reassessed

Delayed staged repair in this setting preserves the kidney and avoids converting a reconstructable injury into a nephrectomy indication.

Ureteral Injury​

Epidemiology and Detection Failure​

Ureteral injuries occur in 0.3–1.9% of colorectal surgeries and at higher rates in gynecologic procedures.[3] The dominant clinical problem is not frequency but detection failure: 50–70% of ureteral injuries are missed intraoperatively, and as few as 17.6% are identified during the primary surgery in some series.[2] Delayed recognition is associated with significantly worse outcomes — pooled OR 0.22 (95% CI 0.12–0.41) for complication management failure compared with intraoperative detection.[6]

Intraoperative Recognition​

When ureteral injury is suspected, the following maneuvers are high-yield:[4][2]

  • Direct inspection of the ureter in its entire course — mandatory during emergency laparotomy if injury is suspected.
  • Cystoscopy with visualization of ureteral efflux — the gold standard. Bilateral jets of clear urine indicate functional continuity; a dry orifice or bloody jet demands further evaluation.
  • Retrograde pyelogram — via cystoscopy or through an open cystotomy when cystoscopic access is not feasible.
  • Intravenous indigo carmine (40 mg slow IV infusion) — watch for blue dye leaking into the surgical field or for a visibly absent ureteral jet.
  • Direct injection of methylene blue or fluorescein into the renal pelvis — demonstrates leakage at the injury site.
  • Retrograde passage of a ureteral catheter — confirms patency, locates obstruction, and often resolves a partial ligature.

Intraoperative cystoscopy with retrograde pyelogram is the diagnostic gold standard for suspected ureteral injury but requires urologic expertise and appropriate patient positioning. When positioning is not feasible, cystotomy for retrograde cannulation is an acceptable alternative.[2]

Injury Types​

  • Complete transection — the classic recognized injury; straightforward to repair if recognized.
  • Partial transection — may heal with stenting alone or may require primary repair.
  • Complete occlusion (ligation or clipping) — the most common iatrogenic injury type and the one most likely to be recognized only after postoperative hydronephrosis and flank pain.
  • Thermal / crush injury — the most subtle and most dangerous. Energy damage extends 1–2 cm beyond the visible lesion and declares itself 3–10 days later as a urinoma or stricture. Thermal injuries require aggressive debridement back to healthy tissue.[2]

Repair by Location​

Injury levelFirst-line repairAdjunct / alternative
Upper ureter (renal pelvis to iliacs)UreteroureterostomyBoari flap + psoas hitch if long defect
Mid ureter (over iliac vessels)UreteroureterostomyTUU if available contralateral ureter
Distal ureter (caudal to iliacs)UreteroneocystostomyPsoas hitch, Boari flap
Extensive loss (>5–8 cm)Boari flap, ileal substitutionRenal auto-transplantation
Severe peritonitisDrainage + delayed repairAuto-transplantation
[2][5]

Core technique (applies to all repairs):[4]

  • Debride devitalized ends back to viable, spatulated mucosa
  • Spatulate both ends on opposite sides to maximize lumen
  • Tension-free, watertight, single-layer interrupted 4-0 or 5-0 absorbable anastomosis
  • Double-J ureteral stent across the anastomosis, leave 4–6 weeks
  • Closed-suction retroperitoneal drain near (not on) the anastomosis
  • Avoid skeletonization — preserve adventitia and longitudinal collaterals

Minimally invasive repair — laparoscopic and robotic ureteroureterostomy is safe and feasible in experienced hands, and produces shorter operative time and less blood loss than ureteroneocystostomy when the injury is detected intraoperatively.[2] In one series, 55.2% of MIS cases were converted to open for urologic reconstruction.[2]

The Skokan Algorithm​

A useful teaching algorithm — widely disseminated through Kato et al.'s A Clinical Guide to Urologic Emergencies (Chapter 7, 2021) and attributed to Alexander Skokan, MD — structures the decision flow for iatrogenic ureteral injury around time of recognition:[1]

  • Intraoperative detection → direct evaluation of injury → spatulated primary repair over DJ stent for short defects; reimplantation (± psoas hitch / Boari) for distal injuries; damage-control drainage if unstable.
  • Postoperative detection → imaging (CT urogram is first-line; retrograde pyelogram confirms level and character) → percutaneous nephrostomy ± antegrade stent for immediate decompression → delayed definitive reconstruction after inflammation resolves, typically at 6–12 weeks.

The algorithm's core insight is that temporizing drainage is almost always the right first move after postoperative detection — attempting immediate reconstruction in an inflamed, infected, or urine-bathed field compounds injury.

The original figure is copyrighted in the published chapter and not reproduced here; see Kato et al. Chapter 7 for the schematic.[1]

Bladder Injury​

Epidemiology​

Bladder injury occurs in approximately 0.36% of laparoscopic emergency surgeries, most commonly at suprapubic trocar insertion, and only 1 in 6 cases is recognized intraoperatively in that setting.[2] By contrast, in gynecologic and obstetric surgery, >90% of bladder injuries are recognized intraoperatively,[7] reflecting both the proximity of the bladder to the primary operative field and the routine use of intraoperative bladder filling and dye instillation.

Intraoperative Recognition​

Signs of bladder injury:

  • Clear or urine-colored fluid in the field
  • Visible Foley balloon or mucosa
  • Gross hematuria in the Foley drainage
  • Gas in the Foley tubing (during laparoscopy — pneumoperitoneum entering the bladder)

Confirmation maneuvers:

  • Retrograde instillation of methylene blue or saline (300 mL) through the Foley, with direct observation for extravasation
  • Intraoperative cystoscopy to define the location of injury relative to the trigone and ureteric orifices
  • Indigo carmine IV with cystoscopic confirmation of bilateral ureteral jets — essential when the injury is near the trigone

Repair​

Direct repair is feasible with excellent outcomes in most cases:[2][4]

  • Two-layer closure — full-thickness inner layer (absorbable 2-0 or 3-0 Vicryl, continuous); imbricating seromuscular outer layer
  • Urethral catheter drainage for 7–14 days (standard)
  • Suprapubic tube considered for: spinal cord injury, complex repair, significant hematuria, associated urethral injury, prolonged catheterization needs
  • Closed-suction drain in the pelvis
  • Post-repair cystogram at 7–14 days (extended to 3–4 weeks for complex injuries); resume voiding only after a leak-free study

Special Considerations​

  • Injury near the trigone or ureteral orifices — place bilateral ureteral stents or retrograde catheters before closure to protect the orifices; if the ureteral orifice is directly involved, perform ureteroneocystostomy into a healthy bladder wall rather than attempting to close over the orifice.[2]
  • Intraperitoneal injury — always requires surgical repair to prevent urinary peritonitis.[4][2]
  • Extraperitoneal injury — most can be managed non-operatively with catheter drainage alone; surgical repair is indicated for injuries involving the bladder neck, associated vaginal / rectal injuries, or pelvic fracture with bony fragment in the bladder.[4]
  • Laparoscopic bladder injury — often requires conversion to open for definitive repair, although laparoscopic repair is feasible with expertise.[2]

Transvesical Approach for Complex Extraperitoneal Injury​

For extraperitoneal injuries involving the bladder neck or when ureteral orifice proximity is uncertain, a transvesical approach via wide anterior cystotomy provides the best exposure. This allows direct inspection of the entire bladder lumen, including the bladder neck and ureteral orifices, and permits direct ureteral catheterization to rule out concurrent ureteral injury.[4]

Outcomes​

  • 98.4% long-term success for intraoperative vesicorrhaphy performed by a consultant urologist.[2]
  • ~1% complication rate after repair of iatrogenic bladder injury, with no significant difference between short (7–10 days) and longer catheterization.[7]

Urethral Injury​

Setting​

Iatrogenic urethral injury is rare and is concentrated in operations that involve deep mesorectal dissection — abdominoperineal resection (APR) and transanal total mesorectal excision (taTME).[2][8] Other settings include radical prostatectomy (intraoperative rectal injury with secondary urethral involvement), complex pelvic reconstruction, and prolonged urethral catheterization leading to pressure necrosis.

The taTME Experience​

A multicenter international study identified 34 urethral injuries during taTME over 7 years.[8] The injuries clustered on the learning curve: 20 of 34 occurred during teams' first 8 cases ("early experience"), with the remainder distributed between cases 12 and 101. Outcomes:[8]

  • 22% conversion to open
  • 8% rate of unplanned APR or Hartmann procedure
  • 26% urethral repair complication rate
  • 9% rate of failed repair requiring permanent urinary diversion
  • 18% of patients with successful repair reported persistent urinary dysfunction

Prevention Strategies[8]​

  • Structured taTME training and proctoring for early-experience injuries
  • Stringent case selection for later-experience injuries related to case complexity
  • Preoperative urethral catheterization with a large-caliber catheter (e.g., 20-Fr) to aid identification
  • Consideration of cystoscopic light-wand illumination or NIR-imaging of the catheter balloon in difficult cases

Repair​

Repair is organ-specific — see PFUI for the reconstructive framework. Principles include tension-free mucosa-to-mucosa anastomosis, prolonged catheter drainage (minimum 21 days, often 4–6 weeks), suprapubic diversion for complex repairs, and delayed posterior urethroplasty when primary repair fails.

Renal Injury​

Most renal trauma is managed non-operatively, and most iatrogenic renal injury during other operations is a vascular injury at the hilum — during laparoscopic adrenalectomy, open nephrectomy for donor work, retroperitoneal lymphadenectomy, or emergency laparotomy for trauma. See Renal Trauma for the full framework.

Indications for Intraoperative Operative Management[4][5]​

  • Hemodynamic instability not responding to resuscitation
  • Grade V injuries with complete hilar avulsion (high likelihood of nephrectomy)
  • Severe renal vascular injury without self-limiting bleeding
  • Main renal vein injury without self-limiting bleeding (angioembolization is not indicated for venous injury)

Operative Technique for Grade IV Salvage​

For Grade IV injuries in hemodynamically stable patients, renal salvage may be attempted:[4]

  • Control bleeding with cautery, topical hemostatic agents (oxidized cellulose, fibrin sealant), and suture ligation of individual vessels
  • Repair collecting system injuries with running absorbable sutures (watertight closure)
  • Reapproximate parenchymal defects with bolstered capsular sutures (pledget or Gelfoam bolster)
  • Consider partial nephrectomy for superior- or inferior-pole injuries involving the collecting system
  • Omental pedicle flap buttress when local tissue is unavailable
  • Closed-suction drain after any collecting system repair

Vascular Injury Management[4][5]​

  • Segmental artery or vein injuries — can be ligated without significant parenchymal loss
  • Main renal vein injury — primary repair feasible if the lumen is not narrowed >50%
  • Main renal artery injury — options include primary repair, end-to-end anastomosis, saphenous vein interposition, or endovascular stent (success rate 25–35%)
  • Nephrectomy is the typical outcome for major hilar injuries, particularly in the unstable patient

Unstable Patient​

Perform nephrectomy with no attempt at renal salvage in the hemodynamically unstable patient or the patient requiring ongoing resuscitation. Salvage attempts in this setting prolong operative time, extend hemorrhage, and do not improve outcomes.[4]

Prevention — Preoperative Risk Stratification​

High-Risk Situations[2]​

Risk factors for IUTI include:

  • Diverticular disease (OR 2.12)
  • T4 malignancy (OR 1.80)
  • Open surgery (OR 1.32)
  • Previous radiotherapy
  • Locally advanced colorectal cancers
  • Visceral obesity
  • Previous colorectal or gynecologic surgery
  • Inflammation and large tumors

Prophylactic Ureteral Stenting​

  • In gynecologic surgery, prophylactic ureteral stenting reduces ureteric injury — pooled OR 0.61 (95% CI 0.39–0.96), NNT 224 to prevent one injury.[6]
  • In colorectal surgery, prophylactic stenting does not reduce the risk of injury.[6] Lighted ureteral stents may aid intraoperative identification but do not reduce injury rates in randomized data.
  • Preoperative CT with excretory phase is the most informative imaging for evaluating urinary tract anatomy and variations in high-risk patients.[2]
  • Visual inspection of trocar insertion and extraction sites during laparoscopy reduces unrecognized bladder injury.[2]

Timing and Outcome​

The single most important determinant of repair success is timing of recognition. Intraoperative detection is associated with a markedly lower rate of complication management failure — pooled OR 0.22 (95% CI 0.12–0.41) compared with postoperative detection.[6] Delayed-diagnosis ureteral injuries are more likely to require nephrectomy; delayed bladder injuries are more likely to present as urinary peritonitis, sepsis, or fistula.

Delayed diagnosis is more common after laparoscopic surgery than open surgery.[2] Urologic consultation and a low threshold for intraoperative cystoscopy during high-risk minimally invasive pelvic procedures are the two modifiable factors most likely to change this outcome.

Documentation and Handoff​

Every intraoperative consultation should produce:

  • A urology operative note distinct from the primary team's note — injury type, location, mechanism, repair technique, suture material, stent placement, drain location
  • A postoperative catheter and stent management plan — catheter duration, cystogram timing, stent removal date, clinic follow-up
  • Imaging follow-up plan — CT urogram or renogram at 4–6 weeks for ureteral repairs; cystogram before catheter removal for bladder repairs
  • Direct communication with the primary team and the patient (postoperatively) about the injury and the recovery timeline

Key Guideline Recommendations​

WSES Guidelines (2023)[2]​

  • Immediate repair of IUTI can be achieved with good results when detected intraoperatively.
  • Three factors influence outcome: (1) injury characteristics, (2) patient condition, (3) available urologic expertise.
  • The urologist's role in the operating room is fundamental when IUTI is suspected.
  • Dynamic management and urologic expertise are keys to repair success.

ACS Best Practices Guidelines (2025)[4]​

  • Direct inspection of the ureter at laparotomy in patients with suspected ureteral injury.
  • Damage-control approach with external urinary drainage for unstable patients.
  • Double-J ureteral stent for repair of all ureteral injuries, adult and pediatric.

References​

1. Kato H, Iijima K, Oguchi T, et al. Iatrogenic Ureteral Injury. Chapter 7 in: A Clinical Guide to Urologic Emergencies. Wiley-Blackwell; 2021. ISBN: 9781119021476. (Figure 2: Algorithm for the evaluation and management of iatrogenic ureteral injury detected intraoperatively and postoperatively, courtesy Alexander Skokan, MD, University of Washington.)

2. de'Angelis N, Schena CA, Marchegiani F, et al. 2023 WSES Guidelines for the Prevention, Detection, and Management of Iatrogenic Urinary Tract Injuries (IUTIs) During Emergency Digestive Surgery. World Journal of Emergency Surgery. 2023;18(1):45. doi:10.1186/s13017-023-00513-8

3. Brollo PP, Puggioni A, Tumminelli F, et al. Preventing Iatrogenic Ureteral Injury in Colorectal Surgery: A Comprehensive and Systematic Review of the Last 2 Decades of Literature and Future Perspectives. Surgery Today. 2024;54(4):291–309. doi:10.1007/s00595-022-02639-9

4. Johnsen N, Wessells H, Archer-Arroyo K, et al. Best Practices Guidelines: Management of Genitourinary Injuries. American College of Surgeons. 2025.

5. Coccolini F, Moore EE, Kluger Y, et al. Kidney and Uro-Trauma: WSES-AAST Guidelines. World Journal of Emergency Surgery. 2019;14:54. doi:10.1186/s13017-019-0274-x

6. Yanagisawa T, Mori K, Quhal F, et al. Iatrogenic Ureteric Injury During Abdominal or Pelvic Surgery: A Meta-Analysis. BJU International. 2023;131(5):540–552. doi:10.1111/bju.15913

7. Jensen AS, Heinemeier IIK, Schroll JB, Rudnicki M. Iatrogenic Bladder Injury Following Gynecologic and Obstetric Surgery: A Systematic Review and Meta-Analysis. Acta Obstetricia Et Gynecologica Scandinavica. 2023;102(12):1608–1617. doi:10.1111/aogs.14641

8. Sylla P, Knol JJ, D'Andrea AP, et al. Urethral Injury and Other Urologic Injuries During Transanal Total Mesorectal Excision: An International Collaborative Study. Annals of Surgery. 2021;274(2):e115–e125. doi:10.1097/SLA.0000000000003597