Intracorporeal Urinary Diversion (ICUD)
ICUD means constructing the diversion within the abdomen using robotic or laparoscopic instruments. It is a route of construction for a conduit, neobladder or selected cutaneous reservoir. It is most often performed during robot-assisted radical cystectomy, and the ileal conduit predominates: in a 170-patient stapled-anastomosis series 75.8% of diversions were ileal conduits, 21% neobladders and 2.3% continent pouches.[11] Specimen extraction and stoma formation still require incisions. Bowel selection, perfusion, storage pressure and outlet suitability remain central; see Urinary Diversion Principles.[1][2]
Evidence That Changes Counseling
Robotic Cystectomy with ICUD versus Open Surgery
The multicenter iROC randomized trial enrolled 338 patients; 317 underwent cystectomy and 305 contributed the primary outcome. Median days alive and outside hospital during the first 90 days were 82 with robotic surgery/ICUD versus 80 with open surgery, with an adjusted difference of 2.2 days (95% CI 0.50–3.85). Of 317 operated patients, 282 (89%) received an ileal conduit. Exploratory 12-week outcomes favored robotic surgery for thromboembolic events (3/161 [1.9%] versus 13/156 [8.3%]) and wound complications (9/161 [5.6%] versus 27/156 [17.3%]); the clinical importance of the 2.2-day primary-outcome difference remains uncertain.[3]
A separate 116-patient randomized trial, reported by Mastroianni with three-year follow-up, found fewer perioperative transfusions with robotic surgery/ICUD: absolute risk reduction 19 percentage points (95% CI 2–36). It did not detect a difference in the secondary outcomes of complications or three-year oncologic outcomes. Robotic surgery cost more, while body image was significantly better in the robotic cystectomy with ICUD arm.[4] Among the 88 neobladder recipients in the latter trial, one-year daytime and nighttime continence recovery probabilities were comparable, although quantitative nighttime pad wetness favored open surgery.[30]
The EAU guideline (2026) rates robotic and open cystectomy as similar for 90-day complications, margins and medium-term oncologic outcomes (level 1a). Its eight-RCT review reports more venous thromboembolic events with open cystectomy (OR 1.8) and longer operative time with robotic cystectomy (mean difference 76 minutes); five trials used ECUD and three used ICUD. The EAU strongly recommends informing patients of the advantages and disadvantages of each approach and selecting centers by experience rather than technique.[25] It makes no recommendation for intracorporeal over extracorporeal diversion and states that ureteroenteric stricture data for the two remain inconclusive, with extracorporeal diversion tending to more strictures.[25]
ICUD versus ECUD after Robotic Cystectomy
The 2021 systematic review included 12 studies and 3,067 patients, reporting lower blood loss and transfusion with ICUD but no significant overall or major-complication difference in the pooled short- and mid-term analyses. ICUD was associated with lower estimated blood loss (mean difference −102 mL), lower transfusion (OR 0.36) and higher lymph node yield (mean difference +3.68 nodes). Major complications were lower with ICUD only in the high-volume-center subgroup (short-term OR 0.57, 95% CI 0.37–0.86; mid-term OR 0.66, 95% CI 0.46–0.94). These subgroup associations are not randomized proof that ICUD alone prevents complications.[5]
Results vary across observational datasets. In the 2,125-patient IRCC study, 1,094 patients (51%) had ICUD. ICUD was associated with shorter operative time (357 versus 400 minutes), less blood loss (300 versus 350 mL) and fewer transfusions (4% versus 19%), but more high-grade complications (13% versus 10%, p = 0.02), which decreased over time.[6] A separate 948-patient institutional comparison (272 open, 301 ICUD, 375 ECUD) associated ICUD with fewer 90-day Clavien III–V complications (16.9% versus 24.8% for ECUD and 26.1% for open, p = 0.015), with differences in case selection, treatment era and center experience.[7] In a 267-patient single-center analysis with standardized complication reporting (162 ICUD, 105 ECUD), the approach was not an independent predictor of postoperative outcomes, and Clavien ≥2 complications occurred in 35% versus 43% (p = 0.2). A significant interaction with age-adjusted Charlson index (p = 0.04) suggested lower risk with ICUD as comorbidity increased.[22]
The Asian registry found lower blood loss and shorter stay, with similar overall complication rates.[8]
Operative Planning
Plan access for the bowel, ureters, urethral anastomosis and premarked stoma. Reduction of steep Trendelenburg and redocking may facilitate reconstruction, depending on platform and team setup. Use atraumatic handling and preserve the mesenteric vascular supply. Trocar layout, assistant side and the choice of grasper are technique choices, not universal requirements.[9][1][10]
Ileal Conduit
- Select the segment. Choose adequate length and reach for the intended stoma and ureteral implantation while preserving terminal-ileal function and mesenteric perfusion.
- Isolate and restore bowel continuity. A stapled side-to-side bowel anastomosis is commonly described. Choose the stapler and cartridge for the actual tissue thickness and device instructions. A vascular load for mesenteric division is not an interchangeable default for bowel-wall stapling. To avoid confusing bowel ends in the robotic field, a dyed (for example, blue) stay suture at each of the two ends to be joined, with undyed stays marking the diversion segment, has been described as a way to place the correct ends on the stapler jaws and confirm orientation before firing.[26] A suspension ("Marionette") stitch — a long suture passed through the abdominal wall, the distal end of the isolated bowel segment, and back out through the same abdominal-wall site, then left untied and clamped — has also been described to raise or lower the segment during dissection and anastomosis.[27]
- Check the bowel anastomosis. Inspect perfusion, lumen, hemostasis and the common-enterotomy closure; avoid mesenteric twist and entrapment.
- Bring the ureters to the conduit. Preserve periureteral vascular tissue and obtain a tension-free course; the left ureter commonly passes beneath the sigmoid mesentery.
- Construct the ureteroenteric anastomoses. Individual Bricker or conjoined Wallace implantation according to anatomy and the reconstructive plan, with stenting as indicated.
- Mature the stoma. Deliver a well-perfused conduit to the marked site without excessive tension, compression or angulation.[1][10]
A 170-patient stapled-anastomosis series demonstrates a described workflow, not that a robotic stapler is mandatory or that its exact suturing method prevents ileus. Device and cartridge details are in the staplers reference and the robotic stapler page.[11]
Orthotopic Neobladder
The Piramide systematic atlas identified nine intracorporeal configurations: Studer, Hautmann, Y-shaped, U-shaped, Bordeaux, Pyramid, Shell, Florence (FIRN) and Padua. It found no direct comparative trial establishing the best design. Select a configuration the team can construct reliably while maintaining a suitable outlet and compliant storage.[2]
The USC technique for the intracorporeal ileal neobladder proceeds in this order: isolation of 65 cm of small bowel, small bowel anastomosis, detubularization, suture of the posterior wall, neobladder-urethral anastomosis with cross-folding of the pouch, and uretero-enteric anastomosis. Operative time fell from 450 to 360 minutes as the technique was refined.[12] In a Studer-type reconstruction, the afferent ileal chimney remains tubular; detubularize only the reservoir-forming portion. Construct the posterior plate, ensure a tension-free dependent urethral anastomosis, and fold/close the reservoir according to the chosen technique. The sequence, bowel length, suture and anastomotic design vary; do not mix steps from different named neobladders indiscriminately.[12][13]
Partly stapled intracorporeal neobladders have been described. A single-center retrospective cohort compared 56 stapled with 60 hand-sewn neobladders; 30- and 90-day complication rates did not differ significantly, and the hand-sewn group had fewer stones (p = 0.01).[31] In the original 45-patient Padua series, substantial complications were reported during 180-day follow-up, emphasizing that technical feasibility and recovery burden are separate outcomes. Median operative time was 305 minutes; 2-year daytime and nighttime continence were 73.3% and 55.5%.[14] In a multi-institutional cohort of 410 patients with intracorporeal neobladder, Clavien III–IV complications occurred in 15% within 30 days and 21% within 90 days.[23] Kaplan-Meier 24-month recurrence-free, cancer-specific and overall survival were 78%, 88% and 86%.[23]
Bricker versus Wallace
Al-Nader's study screened 740 patients and compared 209 propensity-matched patients per group. Per-patient stricture rates were 12% with Bricker and 14.4% with Wallace (p=0.56), but bilateral strictures occurred in one versus 15 patients, respectively.[15]
Kouba's older single-surgeon comparison reported 7/187 versus 0/184 ureters with strictures; those are per-ureter, not per-patient, denominators. In a 96-patient robotic intracorporeal conduit series (72 Bricker, 24 Wallace), strictures, complications and readmissions did not differ significantly.[24] Choose the reconstruction according to ureteral length, perfusion, geometry and disease.[16][17]
In one robot-assisted-cystectomy experience, 51 patients (13% of the reviewed cohort) developed a ureteroenteric stricture, with a Kaplan-Meier estimated prevalence of 12%, 16% and 19% at 1, 3 and 5 years; intracorporeal diversion was among the multivariable predictors of stricture in that cohort.[28] After this experience the group reported abandoning a slit-like thermal-hook enterotomy in favor of an athermal buttonhole enterotomy with the serosa removed, plus retroperitonealizing the proximal anastomotic site, alongside cold scissors, minimal traction, wide ureteral spatulation and an initial alignment stitch to reduce malrotation or back-walling. These technique changes are the authors' reported response to their own stricture experience, not a controlled comparison establishing a lower stricture rate.[29]
Learning and Follow-up
Proficiency cannot be assigned from a universal case count. Published learning curves vary by prior experience, endpoint, diversion type and case selection.
- One surgeon's 203-case series (85 conduits, 118 neobladders) reported acceptable operative quality after 30 consecutive cases, while console time plateaued around case 140 (conduit 60, neobladder 80).[18]
- In a single-surgeon series of 53 conduits, median operating time fell from 415 to 361 minutes and blood loss from 400 to 200 mL. Early cases were selected for lower complexity, with more complex cases handled by open surgery.[21]
- In a 100-patient intracorporeal neobladder series, cumulative-sum analysis found an operative-time plateau (more than three consecutive procedures under 300 minutes) after 20 cases; hemoglobin drop, positive margins and node count did not change significantly along the curve.[19]
- For intracorporeal neobladder at Karolinska, the first surgeon's median operating time fell from 565 to 345 minutes (47 patients), and conversion to open surgery fell from 30% in the first group of ten to zero in later groups. The second surgeon's change (413 to 385 minutes) was not significant.[20]
- IRCC data showed that high-grade complications after ICUD decreased with institutional experience.[6]
Structured mentoring, team consistency and auditing complications are the practical measures.
Follow the actual diversion's long-term needs: drainage/emptying, renal function, upper-tract imaging, metabolic and nutritional effects, stones and stricture. For established strictures, see Ureteroenteric Anastomotic Revision.
For an intracorporeal orthotopic neobladder, one described postoperative pathway maintains pelvic drainage, removes the urethral catheter at about 3–4 weeks once a pouchogram confirms no leak, removes externalized ureteral stents at about one week (or internalized double-J stents cystoscopically at 3–4 weeks), and irrigates the reservoir with saline roughly every 8 hours to limit mucus plugging and catheter obstruction. Feeding tubes attached to the urethral catheter have been used to allow stent removal without cystoscopy, at the cost of losing stent support across the anastomosis if the catheter slips out prematurely.[29]
Videos
References
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2. 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
3. Catto JWF, Khetrapal P, Ricciardi F, et al; iROC Study Team. Effect of robot-assisted radical cystectomy with intracorporeal urinary diversion vs open radical cystectomy on 90-day morbidity and mortality among patients with bladder cancer: a randomized clinical trial. JAMA. 2022;327:2092–2103. doi:10.1001/jama.2022.7393.
4. 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
5. 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
6. 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
7. 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
8. 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
9. Kurpad R, Woods M. Robot-assisted radical cystectomy. J Surg Oncol. 2015;112(7):728-35. doi:10.1002/jso.24009
10. 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
11. 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
12. 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
13. 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
14. 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
15. 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
16. 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
17. 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
18. 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
19. 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
20. 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
21. 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
22. 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):803-812. doi:10.1007/s00345-020-03237-5
23. 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
24. 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
25. European Association of Urology. EAU Guidelines on Muscle-invasive and Metastatic Bladder Cancer. March 2026 update. Section 6.7.4, robotic-assisted laparoscopic cystectomy. Guideline.
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27. Hussein AA, Ahmed YE, Guru KA. Robot-Assisted Intracorporeal Urinary Diversion. In: Daneshmand S, ed. Urinary Diversion. Springer; 2017:55-61. doi:10.1007/978-3-319-52186-2_5
28. Ahmed YE, Hussein AA, May PR, et al. "Natural History, Predictors and Management of Ureteroenteric Strictures after Robot Assisted Radical Cystectomy." J Urol. 2017;198(3):567-574. doi:10.1016/j.juro.2017.02.3339
29. Guru KA. Minimally Invasive Urinary Diversion. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. Campbell-Walsh-Wein Urology. 13th ed. Elsevier; 2025:2843-2859.
30. Mastroianni R, Tuderti G, Ferriero M, et al. "Open vs robotic intracorporeal Padua ileal bladder: functional outcomes of a single-centre RCT." World J Urol. 2023;41(3):739-746. doi:10.1007/s00345-023-04312-3
31. Mastroianni R, Chiacchio G, Tuderti G, et al. "Stapled vs totally handsewn robotic intracorporeal neobladder: perioperative and functional outcomes." BJU Int. 2025;136(5):866-871. doi:10.1111/bju.16826