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Intracorporeal Urinary Diversion (ICUD)

Intracorporeal urinary diversion (ICUD) refers to construction of the urinary diversion entirely within the body using robotic or laparoscopic instruments, without an extracorporeal incision for the reconstructive portion. It is most commonly performed during robot-assisted radical cystectomy (RARC) for bladder cancer. The two principal forms are the intracorporeal ileal conduit and the intracorporeal orthotopic neobladder, with the ileal conduit predominating.[1]

In the International Robotic Cystectomy Consortium (IRCC) registry, ICUD use rose from 9% in 2005 → 97% by 2015 — a near-complete shift in robotic practice.[23] All three principal diversion families can be built intracorporeally:[1][18]

  • Ileal conduit — the technically simplest ICUD; ~ 76% of diversions in modern series.
  • Orthotopic neobladder — most technically demanding; ~ 21%. The Piramide 2024 Eur Urol atlas is the contemporary reference.[8]
  • Continent cutaneous (Indiana) pouch — ~ 2%; least commonly performed intracorporeally.

ICUD is a route of construction, not a different family of diversion: bowel-segment selection, detubularization, ureteroenteric-anastomosis design, and continence-mechanism choice (see Principles of Urinary Diversion) all apply identically.

Patient Positioning and Port Placement​

After the extirpative cystectomy and pelvic lymph node dissection, the robot is typically undocked and the patient taken out of steep Trendelenburg to allow easier manipulation of the small bowel; the robot is then re-docked. Cranial placement of robotic trocars is important for reaching the bowel. The assistant is generally positioned on the patient's left side, with a 12-mm assistant port available for stapler introduction.[2][3] Cadiere forceps are recommended for atraumatic bowel grasping.[3]

Intracorporeal Ileal Conduit — Step-by-Step Technique​

  1. Ileal segment identification and isolation — the terminal ileum is identified and a 15–20 cm segment is selected approximately 15–20 cm proximal to the ileocecal junction. The segment is measured using a pre-cut suture, and the proximal and distal ends tagged with 3-0 polyglactin.[2][4]
  2. Bowel division — the conduit segment is isolated using 60-mm vascular or 45-mm Endo-GIA staple loads introduced through the assistant port, dividing both the bowel and mesentery while preserving the vascular arcade.[2][5]
  3. Restoration of bowel continuity (ileo-ileal anastomosis) — a side-to-side stapled anastomosis is performed. Stay sutures (3-0 polyglactin, ~2 cm apart on the antimesenteric border) approximate the bowel limbs. An enterotomy is made in each limb, and a 60-mm stapler creates the anastomosis. The common enterotomy is closed with an additional staple load or hand-sewn. A novel robotic-stapler stay-suture technique has demonstrated low postoperative ileus (7.0%) and small bowel obstruction (4.7%) rates.[2][6]
  4. Left ureteral mobilization — the left ureter is crossed to the right side beneath the sigmoid mesentery to reach the conduit.[5]
  5. Ureteroileal anastomosis — performed using either the Bricker or Wallace technique:
    • Bricker (end-to-side): a small enterotomy is made on the conduit; each ureter is spatulated and individually anastomosed with 4-0 polyglactin in a running or interrupted fashion.[2]
    • Wallace (end-to-end, conjoined): both ureters are spatulated and sutured together to form a single plate, which is then anastomosed to the proximal conduit end.[5][7]
    • Single-J ureteral stents are placed before completing each anastomosis, with the curl deployed in the renal pelvis and the drainage end passed through the conduit.[2]
  6. Stoma creation — the distal end of the conduit is brought through the abdominal wall at a pre-marked stomal site.

Intracorporeal Orthotopic Neobladder — Key Technical Steps​

Multiple neobladder configurations have been described intracorporeally — Studer, Hautmann, Y-shape, U-shape, Padua, Florence (FIRN), and others — at least nine distinct types have been catalogued.[8]

The general steps (using the USC/Studer technique as a representative example) include:[9][10]

  1. Bowel isolation — a longer segment of ileum (~55–65 cm) is isolated, with the proximal 15 cm left as an afferent chimney (Studer) or the entire segment detubularized (Hautmann).
  2. Bowel continuity restoration — stapled side-to-side ileo-ileal anastomosis, as described above.
  3. Detubularization — the isolated bowel segment is opened along its antimesenteric border using robotic scissors or electrocautery, creating a flat plate.
  4. Posterior plate construction — the opened bowel edges are sutured together (typically running 3-0 barbed suture) to form the posterior wall of the reservoir.
  5. Urethro-neobladder anastomosis — the most dependent portion of the posterior plate is anastomosed to the urethral stump, often using a running suture over a catheter.
  6. Cross-folding and anterior closure — the plate is folded into a spherical reservoir and the anterior wall closed.
  7. Uretero-neobladder anastomosis — the ureters are anastomosed to the afferent limb (Studer) or directly to the neobladder, with stenting.

Median operative times for intracorporeal neobladder range from 305–450 minutes, improving with experience.[9][11] The Padua ileal bladder technique uses a partly-stapled approach to reduce operative time (median 305 min).[11]

Bricker vs Wallace Ureteroileal Anastomosis​

Both techniques yield acceptably low stricture rates. A propensity-matched multi-institutional analysis of 740 patients found no significant difference in per-patient stricture rates (Bricker 12% vs Wallace 14.4%, p = 0.56), but the Wallace technique was associated with a higher risk of bilateral stricture when strictures did occur (15 bilateral in Wallace vs 1 in Bricker), resulting in more affected renal units overall.[12] Conversely, a single-surgeon series found a 3.7% stricture rate with Bricker and 0% with Wallace (p = 0.015).[7] In the robotic intracorporeal setting specifically, a recent comparison found no significant differences in strictures, complications, or readmissions, though Wallace showed favorable trends in operative time.[13]

The Wallace technique may be preferred when ureteral lengths are symmetric; Bricker is often chosen when ureteral lengths are disparate (e.g., in obese patients).[7][14]

Outcomes — ICUD vs ECUD​

A systematic review and meta-analysis of 12 studies (3,067 patients) demonstrated that ICUD is associated with:[15]

  • Lower estimated blood loss (MD −102 mL)
  • Lower transfusion rates (OR 0.36)
  • Higher lymph node yield (MD +3.68 nodes)
  • Comparable overall complication rates

A large single-institution three-way comparison (948 patients) found ICUD had significantly lower 90-day major complication rates (Clavien III–V: 16.9%) compared with extracorporeal (24.8%) and open (26.1%), adjusted OR 0.58 (p = 0.037).[16] The only RCT vs open RC (Mastroianni 2022 / 2024, n = 116) confirmed a ~50% reduction in transfusion rate with RARC-ICUD, with comparable 3-year oncological outcomes and continence recovery, and significantly better body image — at higher cost.[17]

For intracorporeal neobladder specifically, a multi-institutional cohort of 410 patients showed 90-day Clavien III–IV complications in 21%, with 24-month recurrence-free, cancer-specific, and overall survival of 78%, 88%, and 86%, respectively.[18]

OutcomeICUDECUDSource
OR time357 min400 minIRCC[23]
EBL300 mL350 mLIRCC[23]
Transfusion4%19%IRCC[23]
GI complicationsLower (p ≤ 0.001)—Teoh 2021[24]
90-d major complications at high-volume centersOR 0.57 (p = 0.008)ReferenceKatayama 2021 SR[15]
Lymph-node yield+3.68 mean difference (p = 0.01)ReferenceKatayama 2021[15]
90-d overall complicationsComparableComparableKatayama 2021[15]

Volume and learning curve matter: ICUD outperformance vs ECUD on major complications is seen at high-volume centers but not at low-volume centers (Katayama 2021); Mazzone 2021 found ICUD reduces postoperative complications preferentially in highly comorbid patients (interaction p = 0.04).[15][25]

Learning Curve​

The learning curve for RARC with ICUD is substantial but well-characterized:

  • Operative quality (complication rates, margins, lymph-node yield) reaches acceptable proficiency after approximately 20–30 cases for ileal conduit.[19][20]
  • Time efficiency continues to improve and plateaus after approximately 60–140 cases, depending on diversion complexity.[19][21]
  • For intracorporeal neobladder, operative times decreased from a median of 565 → 345 minutes over the learning curve, with conversion rates dropping from 30% → 0%.[22]
  • IRCC data showed high-grade complications after ICUD decreased significantly with institutional experience.[23]
  • An experienced robotic team and structured mentorship can significantly shorten the learning curve for new surgeons.[22]

Practical Implications for the Reconstructive Surgeon​

  • All foundational diversion principles transfer — bowel-segment selection, detubularization, spherical reconfiguration, ureteroenteric anastomotic design, and continence-mechanism choice.
  • The Wallace vs Bricker debate transfers — Carreno 2025 robotic intracorporeal data show comparable perioperative outcomes between Wallace and Bricker.[13]
  • The stapled-vs-handsewn neobladder debate is specific to ICUD — see the staplers reference for Mastroianni 2025 BJU Int data.
  • The robotic stapler is integral to the ileo-ileal anastomosis in RARC + ICUD (Saxena 2025, n = 170: ileus 7.0%, SBO 4.7%, 0 bowel injuries).[6]
  • For management of established ureteroenteric anastomotic strictures (endoscopic, open, robotic, ICG-guided revision, ileal bypass), see Ureteroenteric Anastomotic Stricture Repair.

Videos​

Robotic-Assisted Ileal Conduit
Grand Rounds in Urology (2025)
Robotic Cystectomy with Total Intracorporeal Ileal Conduit
Preeti Urology & Kidney Hospital (2026)

References​

1. Khosla AA, Mendhiratta N, Jatwani K. Urinary diversion after cystectomy for bladder cancer. JAMA Oncol. 2025. doi:10.1001/jamaoncol.2025.3644

2. Kurpad R, Woods M. Robot-assisted radical cystectomy. J Surg Oncol. 2015;112(7):728-35. doi:10.1002/jso.24009

3. Stillings SA, Sundi D. Robotic radical cystectomy, pelvic lymph node dissection, and intracorporeal ileal conduit urinary diversion. J Vis Exp. 2021;(169). doi:10.3791/61331

4. Chen AB, Polotti CF, Zhang M, Yip W, Desai M. Robotic intracorporeal ileal conduit urinary diversion technique. J Endourol. 2021;35(S2):S116-S121. doi:10.1089/end.2020.1079

5. Haudebert C, Hascoet J, Freton L, et al. Cystectomy and ileal conduit for neurogenic bladder: comparison of the open, laparoscopic and robotic approaches. Neurourol Urodyn. 2022;41(2):601-608. doi:10.1002/nau.24855

6. Saxena S, Kim K, Billah MS, et al. Outcomes of stapled ileo-ileal anastomosis during robot-assisted radical cystectomy with urinary diversion: points of technique. J Endourol. 2025. doi:10.1177/08927790251390881

7. Kouba E, Sands M, Lentz A, Wallen E, Pruthi RS. A comparison of the Bricker versus Wallace ureteroileal anastomosis in patients undergoing urinary diversion for bladder cancer. J Urol. 2007;178(3 Pt 1):945-8; discussion 948-9. doi:10.1016/j.juro.2007.05.030

8. Piramide F, Turri F, Amparore D, et al. Atlas of intracorporeal orthotopic neobladder techniques after robot-assisted radical cystectomy and systematic review of clinical outcomes. Eur Urol. 2024;85(4):348-360. doi:10.1016/j.eururo.2023.11.017

9. Chopra S, de Castro Abreu AL, Berger AK, et al. Evolution of robot-assisted orthotopic ileal neobladder formation: a step-by-step update to the University of Southern California (USC) technique. BJU Int. 2017;119(1):185-191. doi:10.1111/bju.13611

10. Lavallee E, Sfakianos J, Mehrazin R, Wiklund P. Detailed description of the Karolinska technique for intracorporeal Studer neobladder reconstruction. J Endourol. 2022;36(S2):S67-S72. doi:10.1089/end.2022.0248

11. Simone G, Papalia R, Misuraca L, et al. Robotic intracorporeal Padua ileal bladder: surgical technique, perioperative, oncologic and functional outcomes. Eur Urol. 2018;73(6):934-940. doi:10.1016/j.eururo.2016.10.018

12. Al-Nader M, Krafft U, Hess J, et al. Bricker versus Wallace ureteroileal anastomosis: a multi-institutional propensity score-matched analysis. Int J Urol. 2024;31(7):813-818. doi:10.1111/iju.15471

13. Carreno GL, Fu H, Messer J. Comparison of perioperative outcomes between Bricker and Wallace anastomosis techniques in robotic-assisted radical cystectomy with intracorporeal diversion. World J Urol. 2025;43(1):415. doi:10.1007/s00345-025-05781-4

14. Liu L, Chen M, Li Y, et al. Technique selection of Bricker or Wallace ureteroileal anastomosis in ileal conduit urinary diversion: a strategy based on patient characteristics. Ann Surg Oncol. 2014;21(8):2808-12. doi:10.1245/s10434-014-3591-z

15. Katayama S, Mori K, Pradere B, et al. Intracorporeal versus extracorporeal urinary diversion in robot-assisted radical cystectomy: a systematic review and meta-analysis. Int J Clin Oncol. 2021;26(9):1587-1599. doi:10.1007/s10147-021-01972-2

16. Zhang JH, Ericson KJ, Thomas LJ, et al. Large single institution comparison of perioperative outcomes and complications of open radical cystectomy, intracorporeal robot-assisted radical cystectomy and robotic extracorporeal approach. J Urol. 2020;203(3):512-521. doi:10.1097/JU.0000000000000570

17. Mastroianni R, Tuderti G, Ferriero M, et al. Robot-assisted radical cystectomy with totally intracorporeal urinary diversion versus open radical cystectomy: 3-year outcomes from a randomised controlled trial. Eur Urol. 2024;85(5):422-430. doi:10.1016/j.eururo.2024.01.018

18. Rich JM, Tillu N, Geduldig J, et al. Contemporary outcomes for robotic radical cystectomy and intracorporeal neobladder urinary diversion. Urol Oncol. 2025;43(6):392.e13-392.e21. doi:10.1016/j.urolonc.2025.02.006

19. Noh TI, Shim JS, Kang SG, et al. The learning curve for robot-assisted radical cystectomy with total intracorporeal urinary diversion based on radical cystectomy pentafecta. Front Oncol. 2022;12:975444. doi:10.3389/fonc.2022.975444

20. Achermann C, Sauer A, Cattaneo M, et al. Retrospective evaluation of a single surgeon's learning curve of robot-assisted radical cystectomy with intracorporeal urinary diversion via ileal conduit. Cancers. 2023;15(15):3799. doi:10.3390/cancers15153799

21. Lombardo R, Mastroianni R, Tuderti G, et al. Benchmarking PASADENA consensus along the learning curve of robotic radical cystectomy with intracorporeal neobladder: CUSUM based assessment. J Clin Med. 2021;10(24):5969. doi:10.3390/jcm10245969

22. Collins JW, Tyritzis S, Nyberg T, et al. Robot-assisted radical cystectomy (RARC) with intracorporeal neobladder — what is the effect of the learning curve on outcomes? BJU Int. 2014;113(1):100-7. doi:10.1111/bju.12347

23. Hussein AA, May PR, Jing Z, et al. Outcomes of intracorporeal urinary diversion after robot-assisted radical cystectomy: results from the International Robotic Cystectomy Consortium. J Urol. 2018;199(5):1302-1311. doi:10.1016/j.juro.2017.12.045

24. Teoh JY, Chan EO, Kang SH, et al. Perioperative outcomes of robot-assisted radical cystectomy with intracorporeal versus extracorporeal urinary diversion. Ann Surg Oncol. 2021;28(13):9209-15. doi:10.1245/s10434-021-10295-5

25. Mazzone E, D'Hondt F, Beato S, et al. Robot-assisted radical cystectomy with intracorporeal urinary diversion decreases postoperative complications only in highly comorbid patients: findings that rely on a standardized methodology recommended by the European Association of Urology guidelines. World J Urol. 2021;39(3):803-12. doi:10.1007/s00345-020-03237-5