Right Colon Pouch
Right-colon and ileocecal reservoirs are a family of reconstructions. Some empty through a catheterizable skin stoma; others connect to the urethra. Reservoir shape, retained ileum, outlet mechanism and ureteral implantation determine their different functional and revision risks.[1][2][3]
See Urinary Diversion Principles for patient selection. A large-capacity colon pouch is not automatically low pressure or continent, and it may still require intermittent catheterization.
Why the Right Colon
The cecum and ascending colon provide a large, distensible segment that can be detubularized and reconfigured for low-pressure storage; filling pressure still varies with reservoir design and function.[2][3] The ileocecal valve region can be reinforced or the terminal ileum tapered to form a catheterizable outlet, as in the Indiana, Florida and Miami designs. The appendix can be embedded submucosally as an outlet: in the original Mainz appendix-stoma report of 13 patients, maximum closure pressure exceeded 80 cm H₂O on pressure profiles and one stoma stenosis needed reoperation.[4] The colonic wall accepts a standard submucosal tunnel for antireflux ureteral implantation.[2]
Operative Principles
Detubularization and reconfiguration aim to provide compliant storage. Preserve the ileocolic or colonic mesenteric supply and confirm that the selected segment reaches its outlet without twisting or tension. Continence depends on the pouch outlet design; the native ileocecal valve may contribute when the ileal outlet is reinforced.[2][4]
Distinguish three separate constructions in the operative record:
- Reservoir: bowel segment, length and configuration, including any undetubularized inlet limb.
- Outlet: tapered ileum, appendiceal flap-valve channel, intussuscepted nipple, another reconstructed channel, or urethral anastomosis.
- Ureteral implantation: individual or conjoined implantation, refluxing or antireflux design, and any stents.
An antireflux tunnel must preserve perfusion and avoid obstruction. In Wiesner's long-term Mainz I comparison, anastomotic obstruction occurred in 59/809 renal units with submucosal implantation and 3/74 renal units with an extramural tunnel; the groups were unequal and observational.[5]
If a reservoir is overloaded, the catheterizable stoma should remain the lowest-resistance outlet so it can vent pressure rather than risk pouch rupture; excessive outlet resistance can also make catheterization difficult. Simmons and Campbell describe placing a large-bore cecostomy tube in a dependent pouch segment for early irrigation of mucus or clots and suturing the reservoir to the abdominal wall at the exit site, which can leave the pouch fixed to the wall and permit later access through the existing cecostomy scar in selected retention cases; this is conditional on a previously placed and fixed cecostomy, not a default puncture route for every reservoir.[23]
Continent Cutaneous Reservoirs
| Design | Defining reconstruction | Dedicated guidance |
|---|---|---|
| Mainz I | Mixed reservoir of 10–15 cm of cecum and ascending colon plus two ileal loops of the same length, opened longitudinally and reconfigured except where tissue is retained for the outlet: leave the lower cecum intact for an appendiceal tunnel or an additional 12 cm of proximal ileum unopened for an intussuscepted nipple.[20][28] | Mainz pouch I |
| Indiana | Detubularized right colon with tapered terminal-ileal catheterizable outlet and reinforced ileocecal valve | Indiana pouch |
| Florida | Right-colon reservoir with ileal catheterizable outlet; several historical modifications | Florida pouch |
| Miami | Right-colon/ileocolonic reservoir with a tapered ileal outlet; described particularly after pelvic exenteration | Selected evidence below |
| Penn | Ileocecal reservoir with an appendiceal Mitrofanoff channel | Penn pouch |
| Turin | Right-colon reservoir with a stapled colonic efferent channel; a distinct small-series design | Its 38-patient report supports feasibility. Median follow-up was 52 months. Complete 24-hour continence was 89%, catheterization difficulty 18.4% and stoma stenosis 10.5%[6] |
| Lundiana | Detubularized right-colon reservoir with a stapled tapered ileal outlet at the ileocecal junction; distinct from an intussuscepted nipple[24] | Selected evidence below |
What the Larger Follow-up Reports Show
The Mainz experience of more than 800 patients reported 92.8% overall continence over a mean follow-up of 7.6 years. Stomal stenosis occurred in 23.5% of appendix stomas and 15.3% of ileal nipples. Stones occurred in 10.8% of reservoirs with an ileal nipple and 5.6% with an appendix stoma. Eleven patients (eight appendix, three nipple) needed reoperation for ischemic degeneration of the continence mechanism. These subgroup comparisons are retrospective, not randomized.[7] In the companion ureteral report, serum creatinine was 1.6 mg/dL or lower at last follow-up in 97% of patients with submucosal tunnel implantation and 98% with an extramural tunnel.[5]
The pediatric Mainz series operated on 70 patients and followed 65, assessing 118 renal units; 113 units were stable or improved. Complete continence was 97%, and revisions were needed for stoma stenosis in 23% and pouch calculi in 15%. The 113/118 upper-tract result concerns renal units; continence and the stoma and stone revisions concern the 65 followed patients.[8]
The Florida pouch uses a detubularized right-colon reservoir with a tapered ileal limb reinforced at the ileocecal valve and directly anastomosed ureters. The report began with 179 patients, but its long-term analysis included 74 patients followed for a mean of 133 months; the other 105 had died or were lost. Outlet incontinence occurred in 6.7%, stomal stenosis in 4% and reservoir stones in 5.4%. Ureteral obstruction occurred in 7 of 108 primary reimplantations and 4 of 14 irradiated ureters (p = 0.02). Severe acidosis developed in 5.5% and low vitamin B12 in 4%. Metabolic alterations occurred in 58% of patients converted from another diversion, compared with 6.4% of the others (p = 0.0001).[9]
Using standardized complication reporting, Myers followed 53 right-colon pouch patients for a mean of 30 months: 22% had major complications (Clavien-Dindo grade 3 or higher) within 90 days, 45% were readmitted within 90 days, 53% had a reoperation or other procedure under general anesthesia, and 32% underwent major abdominal reoperation during follow-up. Diabetes was associated with 90-day major complications and major reoperation, while higher body mass index and prior abdominal surgery were associated with readmission.[1]
Miami Pouch
The Miami pouch uses the terminal 15 cm of ileum and the right colon.[10] The distal ileum is tapered over a 14 Fr catheter, the ileocecal valve is reinforced with three circumferential pursestring silk sutures, and the ureters are anastomosed to the colon without a tunnel.[21] In the original report of 75 constructed Miami pouches (follow-up 7 to 69 months), total continence was reported as 98.6% and ureterocolonic anastomotic success as 90%.[21] Early perioperative complications occurred in 26% and late complications (beyond six weeks) in 23%, and there were five perioperative deaths.[21]
The 2021 Baboudjian series included 15 patients, with median follow-up of 39 months. Thirteen met the study's continence definition of no leakage with catheterization intervals of at most four hours; the other two reported nighttime leakage when intervals stretched to five to seven hours. Two patients had a Clavien III complication within 30 days. No efferent-tube stenosis or catheterization difficulty was reported.[10]
The Salom report included 90 patients treated from 1988–2002, predominantly in an exenteration or radiation setting. Ninety-one percent had received prior radiation. Continence was 93%. Reservoir-related complications affected 53%, most commonly urinary infection (40%), ureteral stricture (20%) and difficult catheterization (18%), and conservative treatment resolved more than 80% of them. Postoperative death occurred in 11%. The selection and extent of pelvic surgery limit comparison with routine cystectomy cohorts.[11]
Lundiana Pouch
The Lundiana pouch combines a detubularized right-colon reservoir with a stapled ileal outlet. In a 30-patient randomized comparison (15 per outlet), leakage episodes were more common with the stapled outlet, while catheterization difficulty was more common with the intussuscepted nipple; resting outlet pressures were similar.[25] A third-party follow-up of 193 patients reported 91% continence (172/188) at a median follow-up of 13 years, and 105 patients (54%) had undergone at least one reoperation, most often for uretero-intestinal stricture (28 patients, 15%). Outlet revision was needed in 16% to maintain continence and catheter access or treat stomal stenosis.[22] Reoperation was more frequent after surgery for benign indications than for malignancy (60% vs 51%, p = 0.04) and in the earlier half of the study period (62% vs 47%, p = 0.03). Independent third-party review found 10 postoperative complications, 17 reoperations and 7 pyelonephritis admissions that the primary chart review had not captured.[22]
Orthotopic Right-colon or Ileocolonic Reservoirs
Orthotopic reconstruction requires a suitable urethra or outlet and willingness to use catheterization if emptying is inadequate.
- Le Bag: a stapled ileocolonic orthotopic design with several modifications; see the dedicated page for construction and the actual continence definitions.
- B-bladder: a Le Bag modification with a Studer-type ileal chimney for the ureteral anastomoses, reported in 29 patients with median follow-up of 3.4 years. Late recurrent urinary infection occurred in 17% and uretero-neobladder stricture in 3%.[12]
- D'Orazio right-colonic neobladder: detubularized, remodeled right colon with an intact cecal segment, reported in 38 patients operated between 1993 and 2004 (the eleven years describe accrual, not follow-up of each patient). Continence came from a low-pressure reservoir of more than 600 mL and haustral contractions of the intact segment that eject urine toward the detubularized portion. Voiding used abdominal tension and mass contractions of the intact segment above 100 cm H₂O. Daytime continence was immediate in 37 of 38 (all by 30 days), nighttime continence was total and immediate in 36 of 38, with satisfactory nighttime continence in the other two, and mean maximum flow exceeded 26 mL/s. One patient needed clean intermittent catheterization.[13]
The Bedük comparison included 19 ileocecal (Mainz) and 36 ileal (Abol-Enein and Ghoneim) neobladder patients. Only 39 underwent the 12-month urodynamic evaluation. Follow-up differed and the groups were small and nonrandomized.[14]
| Parameter | Ileocecal | Ileal |
|---|---|---|
| Capacity | 426 ± 34 mL | 442 ± 27 mL |
| Maximum flow | 19.6 ± 3.7 mL/s | 16 ± 6.1 mL/s |
| Residual volume | 37 ± 8.2 mL | 45 ± 7.1 mL |
| Daytime incontinence | 5.3% | 5.5% |
| Nighttime incontinence (twice weekly or more) | 21% | 8.4% |
| Ureterointestinal stenosis | 10.5% | 5.7% |
| Pyelonephritis | 15.8% | 13.8% |
Urodynamic parameters did not differ significantly.[14]
The Cochrane review of intestinal reconstruction found only five randomized trials involving 355 participants, of small size and moderate or poor quality. It found no evidence that bladder replacement was better than conduit diversion after cystectomy for cancer, and no statistically significant difference in daytime or nocturnal incontinence between ileocolonic or ileocecal and ileal replacement in a two-trial meta-analysis. One small trial suggested less nocturnal incontinence with ileum, of uncertain clinical significance.[15] A 2026 synthesis of one randomized trial and 16 cohorts found better nighttime continence with ileal neobladders than pooled sigmoid and ileocecal comparators, while daytime continence and late complications were similar; heterogeneity and observational designs limit the inference.[29]
Choosing the Outlet and Comparing Quality of Life
An appendiceal channel, tapered ileal limb and reconstructed neo-appendix have different reach and revision issues. Cheng's 58-patient comparison contained 33 Indiana, 15 appendico-umbilical and 10 neo-appendico-umbilical diversions, with baseline age and comorbidity and treatment differences. After a median follow-up of 21 months, the appendico-umbilical and neo-appendico-umbilical groups had more high-grade diversion-related complications than the Indiana group, and the neo-appendico group had more stoma complications (70% vs 30%). Most patients in all groups rated quality of life as good to excellent.[16]
A gender-matched comparison of 45 Mainz pouch I (ileal nipple) and 45 ileal-conduit pairs found no difference in stool incontinence. Mainz pouch patients more often reported increased stool frequency (53% vs 31%), softer stool (60% vs 13%) and diarrhea (62% vs 20%), and less constipation (4% vs 22%). They also reported impaired overall postoperative quality of life more often (51% vs 29%, p = 0.024). Changes in bowel habit belong in preoperative counseling. Selection also weighs catheterization burden, stoma preference and the possibility of revision.[17]
Follow-up and Late Complications
Follow storage and emptying, catheter access, continence, mucus and stone problems, renal function, electrolytes including bicarbonate, and upper-tract imaging. After cystectomy with bowel diversion, measure vitamin B12 annually, as stated in the 2026 EAU functional follow-up text.[26] The frequency of investigations should reflect renal reserve, prior obstruction, biochemical abnormalities and symptoms; a fixed annual pouchogram or arterial blood gas is not necessary for every stable patient.
Ileal resection and urine-exposed bowel create risks of B12 deficiency and hyperchloremic acidosis. In the Mainz metabolic follow-up study, 94 of 458 original patients were examined after a median of nine years; B12 supplementation was recommended in 32% because levels were low-normal or low; clinical examinations found no signs of megaloblastic anemia, funicular myelosis or osteoporosis. A total of 37% were still taking sodium/potassium citrate to prevent acidosis. Bone density was measured in only 18 patients.[18]
A retrospective comparison of 155 patients included only 20 ileocecal pouches, alongside 107 conduits and 28 ileal neobladders. Renal decline did not differ significantly between the diversions. The small ileocecal group limits this comparison.[19]
Promptly assess new hematuria, recurrent symptomatic infection, difficult catheterization, flank pain, hydronephrosis or worsening renal function. In a German multicenter analysis of 17,758 diversions, secondary-tumor prevalence was 1.29% in orthotopic (ileo-)colonic neobladders versus 0.05% in ileal neobladders (p = 0.0001) and 0.14% in ileocecal pouches. The authors advised regular endoscopic evaluation of orthotopic (ileo-)colonic neobladders, which they judged probably at increased risk, from at least the fifth postoperative year, and endoscopy of catheterizable ileocecal pouches when hematuria, chronic urinary infection or hydronephrosis develops.[27] Acute abdominal pain with reduced reservoir drainage or systemic illness raises concern for obstruction or perforation. Medication and irrigation details are maintained in the mucus, B12 and alkali companion pages.
See Also
- Urinary Diversion landing
- Indiana Pouch
- Studer Neobladder
- Hautmann Neobladder
- Ileal Conduit
- Cutaneous Ureterostomy
References
1. Myers JB, Martin C, Cheng PJ, Zhang C, Presson AP. "Outcomes of right colon continent urinary pouch using standardized reporting methods." Neurourol Urodyn. 2019;38(5):1290–1297. doi:10.1002/nau.23951
2. Thüroff JW, Alken P, Riedmiller H, et al. "The Mainz pouch (mixed augmentation ileum and cecum) for bladder augmentation and continent diversion." J Urol. 1986;136(1):17–26. doi:10.1016/s0022-5347(17)44714-8
3. Santucci RA, Park CH, Mayo ME, Lange PH. "Continence and urodynamic parameters of continent urinary reservoirs: comparison of gastric, ileal, ileocolic, right colon, and sigmoid segments." Urology. 1999;54(2):252–257. doi:10.1016/s0090-4295(99)00098-9
4. Riedmiller H, Bürger R, Müller S, Thüroff J, Hohenfellner R. "Continent appendix stoma: a modification of the Mainz pouch technique." J Urol. 1990;143(6):1115–1117. doi:10.1016/s0022-5347(17)40200-x
5. Wiesner C, Pahernik S, Stein R, et al. "Long-term follow-up of submucosal tunnel and serosa-lined extramural tunnel ureter implantation in ileocaecal continent cutaneous urinary diversion (Mainz pouch I)." BJU Int. 2007;100(3):633–637. doi:10.1111/j.1464-410X.2007.06991.x
6. Muto G, Giacobbe A, Collura D, et al. "A right colon pouch with a novel efferent channel concept: long-term results of the Turin pouch." World J Urol. 2021;39(6):1935–1940. doi:10.1007/s00345-020-03412-8
7. Wiesner C, Bonfig R, Stein R, et al. "Continent cutaneous urinary diversion: long-term follow-up of more than 800 patients with ileocecal reservoirs." World J Urol. 2006;24(3):315–318. doi:10.1007/s00345-006-0078-y
8. Stein R, Wiesner C, Beetz R, et al. "Urinary diversion in children and adolescents with neurogenic bladder: the Mainz experience. Part II: continent cutaneous diversion using the Mainz pouch I." Pediatr Nephrol. 2005;20(7):926–931. doi:10.1007/s00467-005-1848-2
9. Webster C, Bukkapatnam R, Seigne JD, et al. "Continent colonic urinary reservoir (Florida pouch): long-term surgical complications (> 11 years)." J Urol. 2003;169(1):174–176. doi:10.1016/S0022-5347(05)64061-X
10. Baboudjian M, Gondran-Tellier B, Michel F, et al. "Miami pouch: a simple technique for efficient continent cutaneous urinary diversion." Urology. 2021;152:178–183. doi:10.1016/j.urology.2021.02.004
11. Salom EM, Mendez LE, Schey D, et al. "Continent ileocolonic urinary reservoir (Miami pouch): the University of Miami experience over 15 years." Am J Obstet Gynecol. 2004;190(4):994–1003. doi:10.1016/j.ajog.2004.01.023
12. Baniel J, Tal R. "The 'B-bladder' — an ileocolonic neobladder with a chimney: surgical technique and long-term results." Eur Urol. 2004;45(6):794–798. doi:10.1016/j.eururo.2004.01.013
13. D'Orazio OR, Lambert OL, Vallati JC, et al. "Total and immediate daytime and nighttime continence with a right-colonic neobladder — what makes it possible? An 11-year followup." J Urol. 2005;174(5):1882–1886. doi:10.1097/01.ju.0000177078.38975.58
14. Bedük Y, Türkölmez K, Baltaci S, Göğüş C. "Comparison of clinical and urodynamic outcome in orthotopic ileocaecal and ileal neobladder." Eur Urol. 2003;43(3):258–262. doi:10.1016/s0302-2838(03)00042-3
15. Cody JD, Nabi G, Dublin N, et al. "Urinary diversion and bladder reconstruction/replacement using intestinal segments for intractable incontinence or following cystectomy." Cochrane Database Syst Rev. 2012;(2):CD003306. doi:10.1002/14651858.CD003306.pub2
16. Cheng KW, Yip W, Shah A, et al. "Stoma complications and quality of life in patients with Indiana pouch versus appendico/neo-appendico-umbilicostomy urinary diversions." World J Urol. 2021;39(5):1521–1529. doi:10.1007/s00345-020-03348-z
17. Frees S, Schenk AC, Rubenwolf P, et al. "Bowel function in patients with urinary diversion: a gender-matched comparison of continent urinary diversion with the ileocecal pouch and ileal conduit." World J Urol. 2017;35(6):913–919. doi:10.1007/s00345-016-1949-5
18. Pfitzenmaier J, Lotz J, Faldum A, et al. "Metabolic evaluation of 94 patients 5 to 16 years after ileocecal pouch (Mainz pouch 1) continent urinary diversion." J Urol. 2003;170(5):1884–1887. doi:10.1097/01.ju.0000091900.57347.ee
19. Pyrgidis N, Sokolakis I, Haltmair G, Hatzichristodoulou G. "The effect of urinary diversion on renal function after cystectomy for bladder cancer: comparison between ileal conduit, orthotopic ileal neobladder, and heterotopic ileocecal pouch." World J Urol. 2022;40(12):3091–3097. doi:10.1007/s00345-022-04211-z
20. Thüroff JW, Alken P, Riedmiller H, Jacobi GH, Hohenfellner R. "100 cases of Mainz pouch: continuing experience and evolution." J Urol. 1988;140(2):283–288. doi:10.1016/s0022-5347(17)41584-9
21. Bloch WE, Bejany DE, Penalver MA, Politano VA. "Complications of the Miami pouch." J Urol. 1992;147(4):1017–1019. doi:10.1016/s0022-5347(17)37451-7
22. Liedberg F, Gudjonsson S, Xu A, Bendahl PO, Davidsson T, Månsson W. "Long-term third-party assessment of results after continent cutaneous diversion with Lundiana pouch." BJU Int. 2017;120(4):530–536. doi:10.1111/bju.13863
23. Simmons MN, Campbell SC. Continent cutaneous urinary diversion: right colonic reservoirs. In: Montague DK, Gill IS, Angermeier KW, Ross JH, eds. Textbook of Reconstructive Urologic Surgery. Informa Healthcare; 2008:375–382.
24. Månsson W, Davidsson T, Könyves J, Liedberg F, Månsson Å, Wullt B. "Continent urinary tract reconstruction - the Lund experience." BJU Int. 2003;92(3):271–276. doi:10.1046/j.1464-410X.2003.04330.x
25. Davidsson T, Hedlund H, Månsson W. "Detubularized right colonic reservoir with intussuscepted ileal nipple valve or stapled ileal ("Lundiana") outlet. Clinical and urodynamic results in a prospective randomized study." World J Urol. 1996;14(2):78–84. doi:10.1007/BF00182562
26. European Association of Urology. EAU Guidelines on Muscle-invasive and Metastatic Bladder Cancer. 2026. Section 7.4, follow-up of functional outcomes and complications. Guideline.
27. Kälble T, Hofmann I, Riedmiller H, Vergho D. "Tumor growth in urinary diversion: a multicenter analysis." Eur Urol. 2011;60(5):1081–1086. doi:10.1016/j.eururo.2011.07.006
28. Thüroff JW, Riedmiller H, Fisch M, et al. "Mainz pouch continent cutaneous diversion." BJU Int. 2010;106(11):1830–1854. doi:10.1111/j.1464-410X.2010.09773.x
29. Li Y, Liu Y. "Ileum vs Colon for Neobladder Reconstruction After Radical Cystectomy: A Systematic Review and Meta-Analysis." Urol J. 2026;23(4):122–132. doi:10.22037/uj.v23i04.8695