Le Bag Ileocolonic Neobladder
The Le Bag is an orthotopic reservoir constructed from detubularized ileum and colon. Light and Engelmann reported the original four-patient experience in 1986. Subsequent modifications changed the outlet, ureteral implantation and reservoir construction; their outcomes should not be treated as a single standardized operation.[1][2][3][4]
Use the Urinary Diversion Principles for patient selection, urethral suitability, emptying requirements and surveillance. The most useful comparative evidence here is the randomized ileal-versus-ileocolonic literature and its Cochrane synthesis; the historical series explain technique variants rather than establish superiority.[5]
Construction and Named Modifications
Detubularization and folding aim to create a capacious reservoir with low storage pressure. Neither use of two bowel segments nor proximity to the pelvis guarantees compliance or a tension-free outlet. The ileocecal valve should not be described as a native antireflux valve protecting ureters implanted into the reconstructed pouch: ureteral drainage depends on the actual implantation or afferent-limb design.[1][3][6][7]
The core construction sequence is to isolate adequately perfused ileocolonic bowel, restore gastrointestinal continuity, detubularize and reconfigure the reservoir, establish a dependent urethral outlet without tension, and implant the ureters according to the selected modification. Segment dimensions and outlet configuration are technique-specific. For example, Kolettis used approximately 20 cm each of ileum and cecum, rather than defining this as a mandatory length for every Le Bag.[4]
| Modification | Operative distinction | Evidence and limits |
|---|---|---|
| Original Light–Engelmann | Composite ileocolonic bladder substitution | Initial four-patient report; evidence of feasibility, not a comparative estimate of long-term function.[1] |
| Vara–Shanberg | Direct urethral–cecal anastomosis replaced the original tubular ileal outlet in 13 patients | The published 17-patient series also included four cutaneous outlets. Its 94% overall day/night continence cannot be assigned to 17 orthotopic neobladders; one of the 13 urethral–cecal patients required intermittent catheterization.[2] |
| Bejany–Politano | Ureteral implantation near the reservoir outlet in a trigone-like arrangement, with the left ureter not crossed | Intended to facilitate upper-tract access. The 25-patient report describes experience over five years, with individual follow-up 3–66 months, not five-year observation of every patient.[3] |
| Cleveland Clinic modification | Absorbable staples used in 22/38 pouches; freely refluxing Bricker implantation in 21/38 | Small, nonrandomized construction comparisons. No statistically significant difference in the reported complication comparisons does not establish equivalence, prove safety or quantify time saved.[4] |
| B-Bladder | Ileocolonic reservoir with a Studer-like isoperistaltic ileal chimney for ureteral implantation | Single-surgeon series of 29 patients, median follow-up 3.4 years. This is an alternative inlet design, not an established best version of Le Bag.[6] |
These summaries do not specify an obligatory vascular division or bowel rotation. The chosen segment must reach the urethra while retaining perfusion, and the ureteral anastomoses must remain unobstructed as the pouch fills. A modification's presumed mechanical benefit must be separated from its demonstrated clinical results.[4][6][5]
Comparative Evidence
Chen randomized study and the Cochrane interpretation
Chen compared an ileocolonic neobladder with a purely ileal neobladder. The Cochrane review records 90 patients randomized, 85 accepting their allocation (42 ileocolonic and 43 ileal), with complete six-month evaluation in 33 and 38, respectively. The published abstract describes those 71 evaluated patients; it is not the initial randomized denominator.[7][5]
| Six-month outcome | Ileocolonic | Ileal |
|---|---|---|
| Reported daytime continence | 90.9% | 89.4% |
| Reported nighttime functional continence | 48.5% | 76.3% |
| Reservoir compliance | Lower | Higher |
The study found better nighttime functional continence and compliance with the ileal reservoir. The absence of a significant daytime difference does not demonstrate equivalence. Lower compliance was a proposed contributor to nocturnal leakage; this comparison does not prove a single causal mechanism or establish outcomes for all Le Bag modifications.[7]
The Cochrane analysis reported a risk ratio of 0.35 (95% CI 0.15–0.79) for nighttime incontinence with ileal versus ileocolonic reconstruction in this study, using its specified unsatisfactory-continence outcome. This is not a risk ratio for Le Bag continence and should not be substituted directly for the differently expressed functional-continence percentages above.[5]
Khafagy trial and the combined evidence
Khafagy randomized 60 patients to ileal (29) or ileocecal (31) neobladders. Reported daytime continence was 93% and 90%, respectively; the ileocecal group had lower residual urine (12 versus 90 mL). The study reported normal pelvicalyceal systems in 93% versus 85% of renal units. That imaging outcome is not a measurement of preserved renal function, and the Cochrane reviewers noted that analyses of paired renal units did not account properly for their dependence.[8][5]
Across Chen and Khafagy, the Cochrane pooled estimate for nighttime incontinence was RR 0.62 (95% CI 0.13–2.87), with substantial heterogeneity and no statistically significant overall difference. The review, whose search ended in October 2011, found the randomized evidence too limited to establish a generally superior reconstruction. Differences in technique and outcome definitions matter; attributing the conflicting findings specifically to refluxing versus nonrefluxing implantation would exceed the evidence.[5]
Historical Outcomes in Context
| Report | What was actually measured | Interpretation |
|---|---|---|
| Bejany–Politano, 25 patients | 100% reported daytime and 92% nighttime continence; no reflux reported; four ureters developed strictures | Small mixed-indication cohort (20 cancer, four interstitial cystitis, one undiversion), including 21 men and four women; not a universal complication rate.[3] |
| Kolettis, 38 men | 91% daytime continence; 80% completely dry or only mildly incontinent at night | The nighttime result is not 80% strict dryness. Construction and implantation subgroups were small and nonrandomized.[4] |
| Johns Hopkins experience, 1986–1998 | Reported 76% continent both day and night, 15% using intermittent catheterization | The publication's 12-year institutional experience is not 12-year follow-up of each patient. Its potency result should not be used as a Le Bag-specific nerve-preservation benefit.[9] |
| B-Bladder, 29 patients | Recurrent UTI 17% and ureteroenteric stricture 3%; median follow-up 3.4 years | The separately reported median survival of 71.1 months is not the median follow-up duration or a comparative functional outcome.[6] |
These cohorts differ in outlet construction, selection, follow-up and definitions of continence. They do not support a numerical ranking against Studer, Hautmann or Mainz reservoirs, or a pooled complication range created by combining unlike denominators.[5]
Metabolic and Functional Follow-up
Ileocolonic reservoirs can produce hyperchloremic metabolic acidosis. In the Kolettis cohort, median bicarbonate decreased from 28 to 24 mmol/L, with a reported association between pouch length and the biochemical change (r = 0.58). That association does not establish a universally safe pouch length. Persistent biochemical acidosis requires assessment even in the absence of symptoms; treatment depends on its severity, renal function and clinical context. See Urinary Acidifiers & Alkalinizers.[4]
Terminal ileal exclusion can affect bile-salt and vitamin B12 absorption; these risks should not be attributed simply to loss of the ileocecal valve. EAU guidance recommends annual vitamin B12 measurement after cystectomy with bowel diversion. Continue functional follow-up for emptying difficulty, residual urine, continence, renal deterioration, obstruction, infection, stones and metabolic abnormalities; investigate changes rather than assuming they are expected consequences of the pouch.[10]
The ability and willingness to perform intermittent catheterization if emptying becomes inadequate remain part of orthotopic-diversion counseling. Use the diversion principles for the shared surveillance and catheterization plan, and the B12 supplementation hub for deficiency management.
Clinical Role
Le Bag is a historical and selected ileocolonic reconstructive option. Its principal educational value is the relationship between reservoir geometry, outlet design and upper-tract drainage. The small comparative literature should inform counseling without claiming that one trial established universal inferiority, that a modification guarantees nocturnal continence, or that staple construction has been proven equivalent to hand sewing.[4][7][5]
See Also
References
1. Light JK, Engelmann UH. "Le Bag: Total Replacement of the Bladder Using an Ileocolonic Pouch." J Urol. 1986;136(1):27–31. doi:10.1016/s0022-5347(17)44715-x
2. Vara AR, Shanberg AM, Sawyer DE, Tansey LA, Martin DC. "Modification of Le Bag Ileocolonic Pouch With Improved Results. Review of 17 Cases." Urology. 1992;40(3):221–6. doi:10.1016/0090-4295(92)90478-f
3. Bejany DE, Politano VA. "Modified Ileocolonic Bladder: 5 Years of Experience." J Urol. 1993;149(6):1441–4. doi:10.1016/s0022-5347(17)36410-8
4. Kolettis PN, Klein EA, Novick AC, Winters JC, Appell RA. The Le Bag orthotopic urinary diversion. J Urol. 1996;156(3):926–930. doi:10.1016/S0022-5347(01)65664-7. PMID:8709365.
5. 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
6. Baniel J, Tal R. "The 'B-Bladder' — an Ileocolonic Neobladder With a Chimney: Surgical Technique and Long-Term Results." Eur Urol. 2004;45(6):794–8. doi:10.1016/j.eururo.2004.01.013
7. Chen Z, Lu G, Li X, et al. "Better Compliance Contributes to Better Nocturnal Continence With Orthotopic Ileal Neobladder Than Ileocolonic Neobladder After Radical Cystectomy for Bladder Cancer." Urology. 2009;73(4):838–43; discussion 843–4. doi:10.1016/j.urology.2008.09.076
8. Khafagy M, Shaheed FA, Moneim TA. "Ileocaecal vs Ileal Neobladder After Radical Cystectomy in Patients With Bladder Cancer: A Comparative Study." BJU Int. 2006;97(4):799–804. doi:10.1111/j.1464-410X.2006.05996.x
9. Eisenberger CF, Schoenberg M, Fitter D, Marshall FF. "Orthotopic Ileocolic Neobladder Reconstruction Following Radical Cystectomy: History, Technique and Results of the Johns Hopkins Experience, 1986–1998." Urol Clin North Am. 1999;26(1):149–56, ix. doi:10.1016/s0094-0143(99)80012-3
10. European Association of Urology. EAU Guidelines on Muscle-invasive and Metastatic Bladder Cancer. 2026. Follow-up, section 7.4. Guideline.