Transplant Urine Leak
A urine leak is an early transplant complication, usually from distal donor-ureteric ischaemia at the ureteroneocystostomy — it presents with reduced urine output, a peri-graft collection and high drain-fluid creatinine, and is managed by drainage and diversion (stent/catheter/nephrostomy), with reconstruction for significant or persistent leaks.
The big picture
Most transplant urine leaks occur early and arise at the distal donor ureter/ureteroneocystostomy, where the ureteric blood supply is most tenuous — ischaemia causes breakdown. Less commonly the leak is from the bladder closure or a calyceal injury. Urine collects around the graft (urinoma), and reabsorption can raise the serum creatinine, mimicking graft dysfunction.
Early post-transplant collection + high drain-fluid creatinine = urine leak — divert (catheter + stent ± nephrostomy) and drain; reconstruct significant or persistent leaks (often via the native ureter).
Mechanism pathway
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Symptom sorter
The common presentation.
Diagnostic algorithm
Each step answers one question. Tap to expand.
Treatment ladder
Divert urine away from the leak and drain the collection so it can heal; reconstruct significant, distal-ischaemic or persistent leaks.
Procedure chooser
- Surgical reconstruction for significant ureteric necrosis or persistent leak — commonly graft-to-native ureter anastomosis (uretero-ureterostomy/pyelo-ureterostomy) or reimplantation
Complications
- Urinoma, infection/sepsis, graft loss
- Subsequent stricture
- Reconstruction leak/stricture
- Drain/stent complications
- Protect distal ureteric blood supply, stented tension-free anastomosis
- Divert and drain; reconstruct necrosis with native ureter
Follow-up
- Resolution of leak/collection
- Graft function and urine output
- Infection
- Imaging to confirm healing before removing diversion; planned stent removal
- Leak sealed, collection resolved, preserved graft function
- Persistent leak, recurrent urinoma, ureteric necrosis
- Persisting drainage or collection; before stent/catheter removal
- Subsequent stricture at the healed/repaired segment
If treatment fails
If the leak persists despite diversion, ask: is there significant distal ureteric necrosis requiring reconstruction rather than continued drainage?
Red flags
Urine leak — divert (catheter + stent) and drain; don't mistake for lymphocele.
Likely distal ureteric necrosis — reconstruct, often via the native ureter.
Drain and give antibiotics — risk to graft and patient.
Summary tables
Transplant urine leak
| Step | Detail |
|---|---|
| Timing/source | Early; distal donor-ureteric ischaemia |
| Confirm | Drain/collection creatinine far above serum |
| First-line | Divert (catheter + stent ± nephrostomy) + drain urinoma |
| Definitive | Reconstruct significant/persistent leaks (native ureter) |
Memory hooks
Early collection + high fluid creatinine = urine leak.
Lymph fluid creatinine ≈ serum; urine >> serum.
Divert (catheter + stent) and drain.
Significant/persistent → reconstruct with native ureter.
Board traps
High fluid creatinine = urine (leak); lymphocele fluid ≈ serum.
Early leak from the distal (ischaemic) donor ureter.
Persistent leak → reconstruct with native ureter.
Clinical cases
One week after transplant, a recipient has falling urine output and a peri-graft collection. Aspirated fluid has a creatinine many times higher than serum.
What is the diagnosis and initial management?