Transplant Ureteric Obstruction
Obstruction of the transplant ureter usually presents as a rising creatinine with graft hydronephrosis — early causes are often technical or a compressing lymphocele, late causes are ischaemic distal strictures; decompress with a nephrostomy and reconstruct durable strictures, often using the native ureter.
The big picture
Obstruction of the transplanted ureter raises creatinine and produces graft hydronephrosis on ultrasound. Early obstruction tends to be technical (kink, oedema, blood clot, tight ureteroneocystostomy) or external compression by a lymphocele or haematoma. Late obstruction is usually an ischaemic stricture of the distal donor ureter (its blood supply is most tenuous there).
Rising creatinine + graft hydronephrosis = obstruction until proven otherwise — decompress with a nephrostomy, then relieve compression or reconstruct durable strictures (often using the native ureter).
Mechanism pathway
Tap any step to see why it happens.
Symptom sorter
The common presentation.
Diagnostic algorithm
Each step answers one question. Tap to expand.
Treatment ladder
Decompress promptly to protect the sole kidney, then treat by cause and durability — drain compression, dilate selected short strictures, reconstruct durable ones.
Procedure chooser
- Ureteric reconstruction for durable/long distal strictures — commonly graft-to-native ureter (uretero-ureterostomy/pyelo-ureterostomy), or reimplantation with a Boari flap
Complications
- Graft impairment/loss, infection of an obstructed graft
- Recurrent stricture after dilation
- Reconstruction leak/stricture
- Stented tension-free anastomosis; reconstruct ischaemic strictures rather than repeatedly dilating
- Decompress, then definitive reconstruction
Follow-up
- Creatinine and urine output
- Resolution of hydronephrosis
- Stricture recurrence
- Post-intervention imaging and renal function; planned stent removal
- Relieved obstruction, recovered function, no recurrence
- Recurrent stricture, persistent hydronephrosis, declining function
- Creatinine rise, after stent removal
- Recurrent stricture, chronic graft impairment
If treatment fails
If obstruction recurs after dilation, ask: is this an ischaemic distal stricture that needs reconstruction rather than repeated dilation?
Red flags
Obstruction until proven otherwise — decompress with a nephrostomy; don't assume rejection.
Ischaemic distal donor ureter — reconstruct (often using the native ureter).
Urgent decompression and antibiotics — the graft is the only kidney.
Summary tables
Transplant ureteric obstruction
| Timing | Typical cause | Action |
|---|---|---|
| Early | Technical / compression (lymphocele) | Decompress; drain compression |
| Late | Ischaemic distal stricture | Reconstruct (native ureter) |
| Any | Infected + obstructed | Urgent nephrostomy + antibiotics |
Memory hooks
↑creatinine + hydronephrosis = obstruction.
Early: technical/compression; late: ischaemic stricture.
Nephrostomy decompresses and localises.
Durable distal stricture → reconstruct with native ureter.
Board traps
Graft hydronephrosis + creatinine rise → obstruction, not rejection.
Recurrent distal stricture → reconstruct, don't keep dilating.
External compression (lymphocele) needs drainage.
Clinical cases
Six months post-transplant a recipient has a rising creatinine; ultrasound shows graft hydronephrosis and an antegrade study reveals a short distal ureteric stricture. Two balloon dilations have already failed.
What is the definitive management?