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Nephropleural Fistula Repair

This is the surgical-technique atlas for nephropleural fistula. For etiology, pathogenesis, clinical presentation, pleural-fluid biochemistry, imaging workup, and prevention, see the clinical-conditions page: Nephropleural Fistula. This page focuses on the stepwise repair framework, drainage and diversion technique, escalation pathway, and the nephrobronchial-fistula special scenario.

Three core repair principles:

  • The cornerstone of management is eliminating the pressure gradient driving urine into the pleural space — urinary diversion (PCN ± stent) is the single most important intervention
  • Most cases resolve conservatively with diversion + pleural drainage (~ 75% in Lallas series; resolution typically within 3 mo)
  • Nephrobronchial fistula is the rare and dangerous variant — requires nephrectomy with double-lumen ETT to prevent contralateral lung flooding

Stepwise Repair Framework​

Step 1 — Acute stabilization and pleural drainage​

  • Tube thoracostomy — immediate drainage of pleural effusion / urinothorax to relieve respiratory compromise
  • Small-bore catheters (8–12F) vs standard large-bore (32F) — both effective; trend toward decreased hospital stay with small-bore (mean 3.9 vs 4.4 d in situ) per Benson 2013[1]
  • Tension hydrothorax — emergent decompression required (Scovell — distal ureteral obstruction causing tension hydrothorax after PCNL)[2]

Step 2 — Urinary diversion (the key intervention)​

The cornerstone — decompression of the renal collecting system eliminates the pressure gradient across the fistula:[3][4][5]

  • Percutaneous nephrostomy (PCN) — most commonly employed and effective. Diverts urine externally, decompressing the collecting system and removing the driving force for pleural urine flow
  • Double-J ureteral stent — internal stenting ensures antegrade flow into the bladder, reducing intrapelvic pressure. Used alone or in combination with PCN
  • Critical: if concurrent distal ureteral obstruction, a stent alone may be insufficient — PCN is essential to prevent continued pleural flow[2]

Treating the underlying uropathy is mandatory — thoracentesis or chest tube alone without addressing the urinary tract results in unfavorable outcomes in essentially all cases.[6]

Step 3 — Observation and fistula healing​

With adequate urinary diversion + pleural drainage, most fistulas heal spontaneously:

  • Lallas 2004 series — 3/4 (75%) resolved with conservative management alone; all fistulas confirmed closed at 3 months[3]
  • Pediatric case (Arora 2015): PCN + repositioning of a displaced DJ stent → complete fistula healing[5]

Step 4 — Escalation for refractory cases​

When conservative measures fail:

  • VATS with decortication — required in 1/4 (25%) of Lallas series for persistent loculated effusion / empyema not resolving with chest tube[3]
  • Intrapleural fibrinolytic (t-PA) — Delvecchio 2012 novel approach for loculated post-PCNL pleural effusion failing antibiotics + chest tube; avoids surgical decortication[7]
  • VATS with diaphragmatic repair — for persistent fistulas with identifiable diaphragmatic defects:
    • Primary suture repair with interrupted non-absorbable monofilament for defects < 2 cm[8][9]
    • Mesh reinforcement (prolene or Marlex) for larger defects[10]
    • Combined mechanical + chemical (talc) pleurodesis at the time of repair — lowest recurrence (OR 0.12 vs other techniques)[11]
  • Open thoracotomy with repair — for large defects or failed VATS; 100% vs 88% VATS in analogous diaphragmatic fistula repair series[10]

Special Scenario — Nephrobronchial Fistula​

When the fistula extends through the lung parenchyma into the bronchial tree (typically from chronic perinephric abscess), management is substantially more complex with higher morbidity / mortality:[12][13][14]

  • Nephrectomy is typically required — the underlying kidney is usually destroyed by chronic infection[13][14]
  • Double-lumen endobronchial tube is mandatory — prevents spillover of purulent material from the fistula into the contralateral lung during surgery; failure to use one has resulted in fatal contralateral lung flooding[14]
  • Operative sequence — divide the fistulous tracts FIRST, before mobilization of the kidney, to prevent contamination of the pleural / bronchial space[14]
  • Drainage of the subphrenic space and pleural cavity is performed in addition to nephrectomy[13]
  • Diaphragmatic repair is performed after excision of the fistula tract[12]
  • Mortality remains significant, particularly in resource-limited settings or with delayed diagnosis[12]

Repair Selection by Scenario​

ScenarioPreferred repair
Post-PCNL nephropleural fistulaChest tube (small-bore preferred) + PCN ± DJ stent; ~ 75% resolve within 3 mo[1][3]
Distal ureteral obstruction → tension hydrothoraxEmergent chest decompression + PCN (NOT stent alone)[2]
Loculated pleural effusion / empyema failing chest tubeVATS decortication or intrapleural t-PA[3][7]
Persistent fistula with discrete diaphragmatic defectVATS diaphragmatic repair (primary suture < 2 cm, mesh for larger) + combined talc pleurodesis[8][10][11]
Failed VATS / large defectOpen thoracotomy with repair (100% vs VATS 88%)[10]
Nephrobronchial fistulaNephrectomy + fistula excision + diaphragmatic repair under double-lumen ETT; divide tracts before kidney mobilization[12][14]
Non-functional / destroyed kidney with persistent fistulaSimple or partial nephrectomy + diaphragmatic repair

Outcomes​

  • Conservative management (urinary diversion + chest tube) succeeds in the majority of post-PCNL nephropleural fistulas — resolution typically within 3 months[3]
  • Early recognition is critical — delayed diagnosis → empyema, trapped lung, or tension hydrothorax[2][3]
  • Spontaneous nephropleural / nephrobronchial fistulas from chronic infection — nephrectomy + fistula excision + diaphragmatic repair is the definitive treatment; morbidity substantially higher[12][13]
  • VATS-vs-open diaphragmatic repair — open thoracotomy 100% vs VATS 88% for analogous diaphragmatic fistulas; combined talc pleurodesis at the time of VATS reduces recurrence (OR 0.12)[10][11]

Key Takeaways​

  • Urinary diversion (PCN ± stent) is the single most important intervention — eliminates the pressure gradient driving urine into the pleural space.
  • Treating the underlying uropathy is mandatory — pleural drainage alone fails in essentially all cases.
  • ~ 75% of post-PCNL nephropleural fistulas resolve conservatively within 3 months (Lallas).
  • Distal ureteral obstruction transforms the fistula into a tension hydrothorax — requires emergent decompression and PCN (not stent alone).
  • Escalation pathway: chest tube + diversion → VATS decortication / intrapleural t-PA → VATS diaphragmatic repair (talc pleurodesis adjunct) → open thoracotomy.
  • Nephrobronchial fistula requires double-lumen ETT and division of fistulous tracts before kidney mobilization to prevent contralateral lung flooding.

References​

1. Benson JS, Hart ST, Kadlec AO, Turk T. "Small-bore catheter drainage of pleural injury after percutaneous nephrolithotomy: feasibility and outcome from a single large institution series." J Endourol. 2013;27(12):1440–1443. doi:10.1089/end.2013.0175

2. Scovell JM, Link RE. "A nephropleural fistula complicated by distal ureteral obstruction results in tension hydrothorax after percutaneous nephrostolithotomy." Urology. 2014;84(6):e28–e29. doi:10.1016/j.urology.2014.08.009

3. Lallas CD, Delvecchio FC, Evans BR, et al. "Management of nephropleural fistula after supracostal percutaneous nephrolithotomy." Urology. 2004;64(2):241–245. doi:10.1016/j.urology.2004.03.031

4. Austin A, Jogani SN, Brasher PB, et al. "The urinothorax: a comprehensive review with case series." Am J Med Sci. 2017;354(1):44–53. doi:10.1016/j.amjms.2017.03.034

5. Arora S, Raj A, Ansari MS. "Nephropleural fistula after percutaneous nephrolithotomy in a pediatric patient: diagnosis and management." Urology. 2015;85(1):e3–e4. doi:10.1016/j.urology.2014.09.019

6. Toubes ME, Lama A, Ferreiro L, et al. "Urinothorax: a systematic review." J Thorac Dis. 2017;9(5):1209–1218. doi:10.21037/jtd.2017.04.22

7. Delvecchio FC, Hall MK, Farber S. "Intrapleural t-PA therapy for loculated pleural effusion arising after percutaneous nephrolithotripsy: a case report." Urology. 2012;80(4):e41–e42. doi:10.1016/j.urology.2012.06.010

8. Furák J, Athanassiadi K. "Diaphragm and transdiaphragmatic injuries." J Thorac Dis. 2019;11(Suppl 2):S152–S157. doi:10.21037/jtd.2018.10.76

9. Coccolini F, Cremonini C, Moore EE, et al. "Thoracic trauma WSES-AAST guidelines." World J Emerg Surg. 2025;20(1):78. doi:10.1186/s13017-025-00651-1

10. Sundaralingam A, Grabczak EM, Burra P, et al. "ERS statement on benign pleural effusions in adults." Eur Respir J. 2024;64(6):2302307. doi:10.1183/13993003.02307-2023

11. Chen HM, Chan HH, Chan HH, Cheung HL. "Surgical management of pleuro-peritoneal fistula in chronic renal failure patient — safety and effectiveness." J Thorac Dis. 2021;13(5):2979–2985. doi:10.21037/jtd-20-3327

12. Burbano MA, Nati-Castillo HA, Castaño-Giraldo N, et al. "Fatal nephrobronchial fistula arising from xanthogranulomatous pyelonephritis: a case report." Front Med. 2024;11:1374043. doi:10.3389/fmed.2024.1374043

13. Hampel N, Sidor TA, Persky L. "Nephrobronchial fistula. Complication of perinephric abscess secondary to ureteral obstruction and pyonephrosis." Urology. 1980;16(6):608–610. doi:10.1016/0090-4295(80)90571-3

14. Rao MS, Bapna BC, Rajendran LJ, et al. "Operative management problems in nephrobronchial fistula." Urology. 1981;17(4):362–363. doi:10.1016/0090-4295(81)90267-3