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Simple (Benign) Nephrectomy

Simple nephrectomy generally refers to removal of a kidney for benign disease, without a planned oncologic lymphadenectomy or routine adrenalectomy. The dissection plane and amount of surrounding tissue removed depend on inflammation and operative safety. The BAUS Nephrectomy Database authors propose the more accurate term "benign nephrectomy", because inflammation and fibrosis can make the operation technically demanding, with higher complication or conversion rates than T1 radical nephrectomy in some cohorts.[1][2][3]

Severe inflammation may require an extrafascial or subcapsular plane; an outside-Gerota approach has been described specifically for inflammatory kidneys. Preserve adjacent organs and choose the safest identifiable plane.[27][1][3][2]

Indications​

Non-functioning kidney (most common)​

Very low split renal function is sometimes labeled non-functioning. In a pediatric PUJO cohort of 15 children with split function below 10%, mean split function increased from 6.7% before percutaneous nephrostomy to 16.8% at 3 months.[4] All 15 then underwent pyeloplasty, and none needed nephrectomy. Salvageability is assessed before nephrectomy is chosen.[4] For pediatric PUJO with <20% differential function, the 2026 EAU guideline describes primary pyeloplasty and nephrectomy as options for family discussion and does not favor routine staged diversion.[46] Etiologies in large series:[5][1]

  • Ureteropelvic junction obstruction is the most common cause (39% of the 505 patients in the Gupta series).[5]
  • Calculus disease accounts for 38%.[5]
  • Chronic pyelonephritis / pyonephrosis.
  • Vesicoureteral reflux with reflux nephropathy.
  • Genitourinary tuberculosis accounts for 9.5%.[5]
  • Renal dysplasia / anomalous kidney.

In the UK BAUS series (n = 1,093), non-functioning kidneys accounted for 49%, other benign conditions 26%, stone disease 13%, and pyelonephritis 12%.[1]

Stone disease​

Indicated when stone disease has caused irreversible parenchymal damage with non-function: staghorn calculi with chronic infection, recurrent stone formation in a non-functioning kidney, or failed prior interventions.

Stone disease carries the highest complication rate of any benign indication: intraoperative complications 9.9% and postoperative 23.9%.[1]

In a safety-net hospital series, stone disease was the leading medical contributor (55.3%), followed by retained ureteral stent (30.6%) and stricture (30.6%). The operating surgeon judged 38.8% of cases preventable had the underlying conditions been addressed earlier.[7]

Xanthogranulomatous pyelonephritis (XGP)​

Destructive chronic pyelonephritis with replacement of parenchyma by lipid-laden xanthoma cells. A systematic review of 40 studies (1,139 patients, 2000–2021) reported:[8][9]

  • Mean age 49; 70% female; 28% diabetic.[8]
  • In the XGP review, renal or ureteric stones were reported in 545/788 patients (69%) and staghorn calculi in 214/450 patients (48%) with those data available.[8]
  • Correctly diagnosed preoperatively only 45% of the time; frequently mistaken for renal neoplasm.[8]
  • Fistulae in 8%.[8]
  • Total nephrectomy is usual for diffuse destructive XGP; partial nephrectomy was performed in 2% of the reviewed patients.[8]
  • Among 630 patients in 27 studies reporting mortality, 18 deaths occurred within one year; the study-weighted mortality estimate was 1.4%.[8]

In a 61-patient retrospective multicenter cohort, ≥28 days of preoperative antibiotics was associated with 6.5 days shorter stay and fewer complications among laparoscopic cases after adjustment for drainage. This does not establish a mandatory course or justify delaying urgent source control.[10]

Renovascular hypertension​

Nephrectomy has been used in selected patients with renovascular disease and a small atrophic kidney that contributes to treatment-resistant hypertension. In a Mayo Clinic observational series of 74 patients (47% had concurrent contralateral revascularization; 28% had prior revascularization), the mean follow-up was 4.1 years, the mean long axis 8 cm and the mean function of the affected kidney 12%:[11]

  • Mean systolic BP fell from 168 to 136 mmHg and diastolic BP from 88 to 76 mmHg (p < 0.0001 for both).
  • The mean number of antihypertensive medications fell from 3.2 to 2.2, and renal function remained stable.
  • In the 39 patients without contralateral revascularization, BP fell from 165/88 mmHg on three medications to 137/77 mmHg on two.[11]

Genitourinary tuberculosis​

GU tuberculosis is treated with combination antituberculous therapy. Nephrectomy may be considered for an unsalvageable symptomatic kidney or other specific complications.[12][13][14] The EAU 2026 infections guideline gives strong recommendations for medical treatment first and a daily six-month regimen (two months of isoniazid, rifampicin, pyrazinamide and ethambutol, then four months of isoniazid and rifampicin). It states that more than 50% of patients still need ablative, endoscopic or reconstructive surgery because of destructive disease and delayed diagnosis, that 26.9% of diagnosed cases involve a non-functioning unilateral kidney and 7.4% renal failure, and that the panel could not make a recommendation on surgery.[36] In a retrospective cohort of 128 patients with 187 affected renal units, reconstruction was associated with 5.44-fold longer renal-unit functional survival than permanent diversion (95% CI 2.71–10.88); the endpoint was time to nonsalvageability, defined as estimated GFR <15 mL/min.[36][44]

In the Skutil/Obsitník series of 631 GU TB patients, 137 (21.7%) underwent nephrectomy. The most common indication was persistent tuberculous cystitis (85/137, 62.0%), followed by chronic infection, calcification, pain, or discomfort (18/137, 13.1%) and suspected nephrogenic hypertension (16/137, 11.7%).[15] In a separate 300-patient series, two-thirds of hypertensive patients with severe unilateral tuberculous nephropathy had lower blood pressure after nephrectomy.[13]

The EAU Urological Infections guideline (2026) states that the optimal timing and surgical approach remain uncertain and that decisions are individualized according to location, disease extent and damage to the genitourinary system. A delay of two to six weeks up to nine months after starting medical treatment has been proposed to allow inflammation to subside. Timing is agreed with the TB team, and urgent drainage or source control is not deferred to satisfy a waiting period.[36]

Autosomal dominant polycystic kidney disease (ADPKD)​

For ADPKD, potential native-nephrectomy indications include those listed below.[16][17][18][19] For people with ADPKD receiving a kidney transplant, KDIGO 2025 suggests native nephrectomy only for a specific indication when benefit outweighs risk (2C):[43]

  • Severe symptoms from massively enlarged kidneys (mass effect).
  • Recurrent or severe infection or bleeding.
  • Complicated nephrolithiasis.
  • Intractable pain.
  • Suspicion of renal cell carcinoma.
  • Insufficient space for a kidney graft.
  • Ventral hernia in the setting of massively enlarged kidneys.

Principles:

  • Timing around transplantation. KDIGO 2025 suggests nephrectomy at or after transplantation whenever possible (2C).[43] For inadequate graft space, ERA 2025 Practice Point 7.3 favors nephrectomy 1–3 months before or simultaneous with transplantation to minimize time with reduced residual renal function.[17] Timing also depends on infection, bleeding, and donor availability.
  • Hand-assisted laparoscopic nephrectomy. KDIGO suggests it over open surgery when feasible (2D), with the approach selected by anatomy and expertise.
  • Laterality. KDIGO suggests unilateral rather than bilateral native nephrectomy when appropriate, based on clinical judgment and local expertise (2D).[43]
  • Nephrectomy is performed in up to about 20% of ADPKD patients.[19]
  • Renal artery embolization. The ERA 2025 consensus considers it after multidisciplinary consultation for volume reduction or cyst hemorrhage, weighing surgical and anesthesia risks against a lower chance of success and post-embolization syndrome; embolization is not an alternative for cyst infection or suspected malignancy.[17]
  • The ERA 2025 consensus classifies native nephrectomy as an intermediate-risk procedure; mortality was 1.5% across 2,106 procedures, with emergency cases contributing disproportionately. Selected transplant cohorts reported similar patient and graft survival with or without nephrectomy.[17]

Other benign indications​

  • Chronic pain from a non-functioning kidney.
  • Recurrent UTI from a non-functioning kidney serving as an infection nidus.
  • Failed prior reconstruction (e.g., failed pyeloplasty).
  • Renal hypoplasia / dysplasia.
  • Multicystic dysplastic kidney (when symptomatic).
  • Iatrogenic ureteral injury producing a non-functioning kidney.[3][5]

Surgical Approaches​

Open simple nephrectomy​

Appropriate when exposure, inflammatory burden, vascular anatomy, kidney size or team expertise favor it.

Flank (retroperitoneal) approach.

  • Lateral decubitus, affected side up.
  • Incision over the 11th or 12th rib, posterior axillary line to anterior axillary line.
  • Divide external oblique, internal oblique, transversus abdominis.
  • Select the safe plane according to inflammation; this may be intrafascial, extrafascial or subcapsular.
  • Identify the hilum; ligate and divide renal artery and vein individually.
  • Manage the ureter according to the indication and stump risks; do not add unnecessary distal dissection solely for maximal length.
  • Direct retroperitoneal access without entering the peritoneum or manipulating bowel.
  • The posterior lumbotomy (Novick) is used for bilateral nephrectomy, simple nephrectomy for benign disease, and pyeloplasty.[20]

Transperitoneal (anterior subcostal) approach. Wider exposure for larger kidneys or when additional abdominal exploration is needed; requires bowel mobilization.[21]

In the Gupta retrospective series, open cases had shorter mean operative time (70 versus 85 min), greater blood loss (170 versus 110 mL), and longer stay (5 versus 3 days).[5]

Laparoscopic simple nephrectomy​

A commonly used approach for appropriately selected benign nephrectomy; 76% of the 1,093 benign nephrectomies in the 2012 UK BAUS database were laparoscopic.[1]

Transperitoneal. Lateral decubitus; 3–4 ports along anterior axillary and midclavicular lines; reflect colon medially (Toldt); control hilum with clips, staples, or sutures; retrieve the specimen in a bag through a suitable incision. Morcellation requires careful exclusion of suspected malignancy and a deliberate plan for pathological assessment.

Retroperitoneal. Lateral decubitus or prone; balloon-dilate the retroperitoneal space; 3 posterior ports; direct hilar access without bowel mobilization. Retroperitoneal access can avoid peritoneal entry after prior abdominal surgery, but inflammatory disease or prior drainage can scar this space; choose the route from CT extent and operative experience.[22][5][3][27]

The largest retroperitoneoscopic series (Gupta n = 505):[5]

  • 476 of 505 (94.2%) were completed retroperitoneoscopically, and 25 were converted to open surgery.[5]
  • Mean OR time 85 min; mean blood loss 110 mL.[5]
  • Transfusion rate 0.8% (versus 4.5% open).[5]
  • Mean LOS 3 d (versus 5 d open).

Robotic simple nephrectomy​

Robotic nephrectomy is feasible. The Rogers series included 42 patients (35 radical and 7 simple nephrectomies for four xanthogranulomatous pyelonephritis and three atrophic kidneys). Mean console time was 158 minutes, mean stay was 2.4 days and no case was converted to open surgery. Outcomes were not reported separately for the benign cases.[23]

Subcapsular nephrectomy​

When severe perirenal inflammation makes extracapsular dissection hazardous (XGP, pyonephrosis, TB), the renal capsule is incised and the kidney dissected within the capsule, leaving the capsule adherent to surrounding structures. Hilar vessels are controlled from within the capsule. Used in 6/52 (11.5%) pyonephrotic kidneys in one series.[24][25][26]

Why Benign Nephrectomy Is Harder Than Radical​

ParameterSimple (Benign)Radical (T1 Cancer)
Intraoperative complications5.2%3.7%[1]
Postoperative complications11.9%10.0%[1]
Conversion to open (MIS)5.9% (1.8× higher)3.3%[1]
Blood transfusion4.8%2.8%[1]
Operative timeLonger (p = 0.001)Shorter
Length of stayLonger (p = 0.049)Shorter

References:[1][2]

The main reasons are anatomic:[1][3][2][27]

  1. Perirenal fibrosis and adhesions from chronic inflammation obliterate tissue planes.
  2. Hilar lymphadenopathy obscures vascular anatomy.
  3. Pyonephrosis / abscess raises contamination and sepsis risk.
  4. Prior surgery / nephrostomy introduces dense scarring.
  5. Loss of the Gerota's-fascia plane that makes the radical operation predictable.

In the single-center comparison, conversion to open surgery did not differ significantly between simple and radical nephrectomy, but infected simple nephrectomies had longer OR time and LOS, greater blood loss, and more intensive care use than non-infected simple nephrectomies.[2] In a laparoscopic series of 50 inflammatory kidneys (43 pyelonephritis, 5 XGP, 2 pyonephrosis), 14 (28%) were converted to open surgery, mainly for adhesions and vascular or intestinal injury.[27] These complex cases call for explicit conversion and organ-injury counseling.[27][28]

Complications​

Overall (BAUS n = 1,093):[1]

  • Intraoperative 5.2%; postoperative 11.9%; blood loss >500 mL 6.8%; transfusion 4.8%; MIS conversion 5.9%.[1]

By pathology:[1]

PathologyIntraoperativePostoperative
Stone disease9.9%23.9%
Pyelonephritis5.4%14.0%
Non-functioning kidney4.3%9.3%
Other benign4.6%9.5%

Specific complications to anticipate:[27][21][29][3][28]

  • Vascular injury. Renal vein or IVC injury, particularly on the right side with inflammatory hilar adhesions.
  • Visceral injury. Bowel (including colon), splenic (left), or duodenal (right) injury; visceral injury overall was more frequent with laparoscopy in one retrospective inflammatory-nephrectomy comparison.[28]
  • Pleural entry. More common with the open flank approach.
  • Wound complications. Flank bulge, hernia, wound infection.
  • Postoperative bleeding. May require transfusion or re-exploration.
  • Ileus. Particularly with the transperitoneal approach.

Emergency nephrectomy for surgical pyelonephritis​

In a recent series of 88 patients with surgical pyelonephritis (pyonephrosis, renal or perinephric abscess, emphysematous pyelonephritis), 10 underwent primary emergency nephrectomy and 9 required secondary nephrectomy after failed conservative management. Diabetes was more prevalent among the primary emergency nephrectomy patients, and high ASA score, CKD and smoking were associated with conservative-management failure.[30] A separate retrospective cohort of 109 adults admitted to 48 French ICUs with EPN found nephrectomy within 24 hours of ICU admission in 14 patients associated with lower adjusted 90-day mortality (HR 0.18, 95% CI 0.04–0.90).[45]

Emphysematous pyelonephritis is a severe necrotizing renal infection producing gas within the parenchyma, collecting system or perinephric tissue. A 2011 review reported uncontrolled diabetes in up to 95% of cases, while a 62-patient three-center cohort found diabetes in 69.3% and E. coli as the most common isolate (62.7%).[37][38] In Wan's CT scheme, type I denotes parenchymal destruction with either no fluid collection or streaky/mottled gas, and type II denotes renal or perirenal fluid with bubbly/loculated gas or collecting-system gas (mortality 69% versus 18% in 38 patients). In Huang and Tseng's different scheme, class 2 is parenchymal gas without extrarenal spread; all nine class-2 patients treated with percutaneous drainage and antibiotics recovered, one survived primary nephrectomy, and one died after antibiotics alone.[37][38][39][40] CT extent, physiologic severity, and response to source control inform treatment.[37][38][39][40]

Long-Term Renal Function​

When a benign kidney loses function gradually, the contralateral kidney may have had time to compensate. The comparison below excluded patients with preoperative GFR <60 mL/min/1.73 m², a history of proteinuria or urinary tract infection, diabetes, hypertension, obesity, contralateral imaging abnormalities, or nephrotoxic drug use.[31] In a retrospective comparison of 276 patients (202 radical, 74 simple nephrectomy), preoperative GFR was similar between groups.[31]

  • At last follow-up (mean 27.2 months after simple and 24.3 months after radical nephrectomy), mean GFR decline was 6% versus 29%, respectively (p < 0.05); the cohorts had different indications and mean ages.[31]
  • Postoperative GFR is significantly higher after simple nephrectomy at all time points (1 d, 1 mo, 1 yr, last follow-up).
  • The proposed mechanism is compensatory hypertrophy of the contralateral kidney as the diseased kidney gradually loses function before surgery.

Older reduced-renal-mass literature describes compensation after nephrectomy; progressive kidney disease remains possible in benign urologic disease. Baseline contralateral function, proteinuria, blood pressure, diabetes and other CKD risks determine ongoing surveillance needs.[32]

Preoperative Optimization​

For inflammatory or infected kidneys:[5][10][12][13][14][33][4]

  • Percutaneous nephrostomy to drain pyonephrosis or obstructed infected systems before definitive nephrectomy. 33/36 pyonephrotic patients had preoperative PCN in the Gupta series.[5]
  • Culture-directed antibiotics and drainage for XGP; duration depends on infection control and planned surgery. A ≥4-week association in a retrospective cohort is not a mandatory waiting rule.
  • Coordinate renal TB therapy and surgery with specialists; current EAU guidance does not establish a fixed six-week surgical threshold.[36]
  • CT with contrast to map perirenal inflammation, hilar anatomy, adjacent organ involvement, and vascular anomalies. In a 403-patient retrospective XGP nephrectomy cohort, Malek stage 3 paranephric extension, qSOFA ≥2, elevated creatinine, and positive urine culture were independently associated with major complications.[41]
  • Nuclear renography to assess differential function and drainage; consider recoverability and possible reconstruction before nephrectomy.

For ADPKD:[16]

  • Consider kidney imaging (for example abdominal MRI) within 1 year before anticipated transplantation to assess for solid or complex cystic lesions; individualize the evaluation for renal cell carcinoma.[16]
  • Subtract estimated total kidney and liver weights from body weight for accurate BMI assessment.

Approach Selection​

Clinical scenarioPreferred approachRationale
Elective non-inflammatory NFKRetroperitoneoscopic or laparoscopicCommonly used when anatomy and expertise are suitable.[1][2]
Inflammatory kidney (XGP, pyonephrosis)Individualize laparoscopic or open accessRetroperitoneal access can avoid peritoneal entry, but inflammation may obscure that plane. In a retrospective 403-patient XGP cohort, open retroperitoneal access was associated with more major complications than open transperitoneal access; select the route by disease extent and expertise, with a conversion plan.[3][27][41]
Prior ipsilateral surgery / nephrostomyIndividualize accessThe retroperitoneum itself may be scarred; map prior incisions, drainage tracts and inflammatory planes.[5]
ADPKD (massively enlarged)Individualize hand-assisted laparoscopic or open accessHand assistance can facilitate extraction of large kidneys. KDIGO conditionally suggests it over open surgery when feasible (2D), whereas the 2026 KDOQI US commentary disagrees and leaves access selection to the surgical team, citing infected cyst spillage and possible occult cancer dissemination.[16][19][42]
Renal TBIndividualized access and timing with TB treatmentSubcapsular if severe adhesions.[12][25]
Emergency nephrectomy for severe infectionOpen or minimally invasive, individualizedStart with antibiotics, stabilization and drainage when feasible; nephrectomy may be needed for failed source control or an unsalvageable kidney. Select access by anatomy and stability, with readiness to convert in an inflamed field.[30][38][27]
PediatricMIS (any approach)Approach depends on anatomy, size and expertise; comparative studies are observational.[34]

Special Populations​

Pediatric​

Minimally invasive nephrectomy is commonly used in suitable pediatric cases. In a single-center retrospective comparison of 213 nephrectomies (single-instrument retroperitoneoscopic, two-instrument retroperitoneoscopic, transperitoneal, and open), intraoperative complications were significantly more frequent in the open group (p = 0.03), with comparable OR time and LOS. No conversions occurred in the retroperitoneoscopic groups.[34]

Elderly​

Age-specific data for benign nephrectomy are limited. A historical single-institution series of 646 consecutive conventional nephrectomies (1978–1997; 209 for benign disease) reported complications in 15.5% and 30-day mortality of 3.1%. Complication rates were lower after nephrectomy for benign than for malignant disease (p < 0.001), with no difference by operative approach.[35]

Social determinants​

In a safety-net hospital series, social factors contributing to simple nephrectomy included lack of insurance (58.5%), substance abuse (32.3%), mental health (24.6%), and immigration status (18.5%). The authors framed simple nephrectomy as potentially representing a "failure of management" of underlying conditions; awareness can guide prevention strategies.[7]

Outcomes Summary​

SeriesnApproachOR timeEBLConversionLOSComplications
BAUS UK 2016[1]1,09376% laparoscopic; 847/1,093 MIS (77.5%)NR>500 mL in 6.8%5.9% of MISNR5.2% intra / 11.9% post
Gupta 2008[5]505Retroperitoneoscopic85 min110 mL5.0%3 d0.8% transfusion
Hemal 2001[24]185 (nephrectomy or nephroureterectomy)Retroperitoneoscopic100 min133 mL9.7%3 d16.2% minor / 3.8% major
Papadopoulou 2024[2]129MixedLonger than RNSimilarSimilarLonger than RNHigher than RN
Hsiao 2008[3]45 attempted (42 completed)Laparoscopic202.5 min (median)100 mL (median)3/45 (6.7%)Variable9/42 completed (21.4%)
Parra 1995[6]12Laparoscopic145 minNR8.3%3.5 d16.7%

See Also​

References​

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2. Papadopoulou A, Campain N, Abu-Ghanem Y, et al. Not-so-simple nephrectomy: comparative analysis of radical and simple nephrectomy in a high-volume tertiary referral center. Int J Urol. 2024;31(2):160–168. doi:10.1111/iju.15330

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