Transplant Surgical Anatomy
The transplanted kidney sits extraperitoneally in the iliac fossa, with its artery and vein anastomosed to the iliac vessels and the donor ureter implanted into the bladder over a stent — an anatomy that explains where every transplant complication occurs.
The big picture
A kidney transplant is placed heterotopically (not in the native renal bed) in the iliac fossa, extraperitoneally. The renal artery is anastomosed to the external (or internal) iliac artery and the renal vein to the external iliac vein. The donor ureter is short and is implanted into the bladder via a tunnelled (anti-reflux) ureteroneocystostomy, usually over a temporary JJ stent. The graft's blood supply is end-arterial and its ureter relies on a tenuous distal blood supply from the renal vessels.
Iliac fossa, extraperitoneal, vessels-to-iliacs, ureter-to-bladder over a stent — and the distal donor ureter is the ischaemia-prone Achilles' heel.
Red flags
Consider graft vascular thrombosis — end-arterial supply makes this a surgical emergency.
Likely lymphocele — drain/fenestrate.
The distal donor ureter is ischaemia-prone — often managed using the native ureter.
Summary tables
Standard transplant anatomy
| Structure | Configuration |
|---|---|
| Position | Iliac fossa, extraperitoneal |
| Artery | Renal artery → external/internal iliac artery |
| Vein | Renal vein → external iliac vein |
| Ureter | Donor ureter → bladder (tunnelled, stented) |
| Weak point | Distal donor ureter (ischaemia) |
Memory hooks
Iliac fossa, extraperitoneal.
Artery→iliac artery; vein→iliac vein.
Ureter→bladder, over a stent.
Distal donor ureter = ischaemia-prone weak point.
Superficial graft = easy ultrasound/biopsy.
Board traps
Distal donor ureter is the ischaemia-prone segment (leaks/strictures).
End-arterial supply → thrombosis is catastrophic.
Lymphocele from divided iliac lymphatics can obstruct the ureter/vein.
Clinical cases
A transplant recipient develops a urine leak two weeks post-operatively. The team asks which part of the reconstruction is most often responsible.
Which segment is most vulnerable and why?