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PCNL Surgery for Large Kidney Stone

PCNL Surgery for Large Kidney Stone

📖 9 min read Written/reviewed by Dr. Alhad Naragude, MBBS, MS, DrNB Urology Last updated: June 21, 2026

PCNL surgery for large kidney stone: short answer

PCNL surgery for large kidney stone is a keyhole kidney operation used mainly for stones larger than 2 cm, staghorn stones, multiple kidney stones or stones that are unlikely to clear well with RIRS or ESWL. In PCNL, the urologist makes a small puncture through the back, enters the kidney directly, breaks the stone and removes the pieces. For many large stones, PCNL gives better stone clearance in fewer sittings than shock wave treatment or flexible ureteroscopy. AUA and EAU guidance support PCNL as first-line treatment for many adult kidney stones larger than 2 cm.

What is PCNL surgery?

PCNL means percutaneous nephrolithotomy.

Percutaneous means through the skin. Nephro means kidney. Lithotomy means stone removal.

So, PCNL is a surgery where the kidney stone is removed through a small opening in the back instead of a large cut. A kidney telescope is passed through this track. The stone is broken with laser, ultrasonic or pneumatic energy and the fragments are removed.

PCNL is usually used when the stone is too large, too hard, too complex or too infected for simpler treatments to give reliable clearance. BAUS describes PCNL as a keyhole method where the kidney is punctured under X-ray or ultrasound guidance and instruments are passed to break and remove stones.

Who may need PCNL surgery?

A urologist may advise PCNL if you have:

  • Kidney stone larger than 2 cm.
  • Staghorn calculus, a branching stone occupying a large part of the kidney.
  • Multiple stones inside the kidney.
  • Large lower pole kidney stone.
  • Hard stone with high density on CT scan.
  • Stone causing hydronephrosis, which means swelling of the kidney due to urine blockage.
  • Stone with recurrent urine infection.
  • Large residual stone after RIRS, URSL, ESWL or previous PCNL.
  • Large stone in a solitary kidney where effective clearance is important.

Stone size is important, but it is not the only factor. The decision also depends on stone location, kidney anatomy, urine infection, kidney function, diabetes, blood thinners, previous surgery and anaesthesia fitness.

Why PCNL is preferred for many large kidney stones

For stones above 2 cm, PCNL is often preferred because it can remove a larger stone burden directly. ESWL may need multiple sittings and may leave fragments. RIRS can be useful in selected cases, but large stones may need staged procedures. EAU guidance states that stones over 20 mm should primarily be treated with PCNL because shock wave treatment often requires multiple sessions and may lead to blockage by stone fragments.

Treatment option Usually useful for Limitation in large kidney stones
Observation Small, silent, stable stones Not ideal for large, growing, infected or obstructing stones
Medicines Pain control, infection control, selected uric acid stones Most large calcium stones do not dissolve with medicines
ESWL Smaller stones in favourable location Large stones may need repeated sessions and can leave fragments
RIRS Small to moderate kidney stones; selected larger stones Large stones may need staged surgery
PCNL Large stones, staghorn stones, complex stones More invasive than RIRS/ESWL; bleeding and infection risk must be assessed

When medicines or observation may not be enough

Many patients ask whether a large kidney stone can pass naturally or dissolve with medicines.

Medicines can help with pain, infection or selected uric acid stones. But most large calcium stones do not dissolve with tablets. Observation may be reasonable for small, stable, non-obstructing stones, but it is usually not ideal when the stone is large, growing, infected, painful or blocking urine flow.

A large stone with fever, kidney swelling or pus in urine should not be ignored. Infected obstruction can become dangerous and may need urgent drainage before definitive stone surgery.

How is PCNL surgery done?

PCNL is usually done under general anaesthesia.

The usual steps are:

1. Pre-operative planning

CT KUB is reviewed to check stone size, stone location, stone density, kidney anatomy and safest access route.

2. Urine and blood tests

Urine routine, urine culture, creatinine, CBC and coagulation profile are checked before surgery. If urine culture shows infection, antibiotics are given before surgery.

3. Anaesthesia

You are asleep and do not feel pain during the operation.

4. Kidney puncture

The kidney is punctured from the back or side under ultrasound or X-ray guidance.

5. Track dilatation

The puncture track is widened so a nephroscope, a kidney telescope, can enter the kidney.

6. Stone fragmentation

The stone is broken using laser, ultrasonic or pneumatic energy.

7. Stone removal

Stone pieces are removed with instruments, suction or irrigation.

8. Drainage decision

A DJ stent, nephrostomy tube or urinary catheter may be placed depending on bleeding, swelling, infection risk, residual fragments and surgeon judgement.

Standard PCNL, mini-PCNL and tubeless PCNL

PCNL has different forms. The best option depends on stone burden, kidney anatomy and safety.

Type Meaning When it may be used
Standard PCNL Uses a larger access track Large stone burden, staghorn stones, faster fragment removal
Mini-PCNL Uses smaller instruments Selected stones where reducing bleeding or pain is useful
Tubeless PCNL No nephrostomy tube is left Selected uncomplicated cases
Totally tubeless PCNL No nephrostomy tube and no DJ stent Carefully selected uncomplicated cases

EAU guidance notes that smaller instruments may reduce blood loss but can increase operating time, and tubeless PCNL can be considered in uncomplicated cases.

Will I need a DJ stent, catheter or nephrostomy tube?

You may need one or more tubes temporarily.

Urinary catheter

A catheter drains urine from the bladder after surgery. It is usually temporary.

DJ stent

A DJ stent is an internal tube from the kidney to the bladder. It helps urine drain while swelling settles. It can cause burning urination, frequent urination, urgency, blood in urine and side pain during urination.

Nephrostomy tube

A nephrostomy tube comes out from the back and drains urine directly from the kidney. It may be kept if there is bleeding risk, infection risk, residual stone, difficult access, urine leak or possible need for a second-look procedure.

Whether you need a tube is often decided during surgery, not before surgery alone.

When PCNL may be delayed

PCNL may be delayed if there is:

  • Active urine infection.
  • Fever with obstructed kidney.
  • Uncontrolled diabetes or blood pressure.
  • Unsafe blood thinner status.
  • Bleeding disorder.
  • Pregnancy.
  • Patient not fit for anaesthesia.
  • Suspicion of tumour in the kidney or puncture path.

If there is infected obstruction, the first step may be emergency DJ stenting or nephrostomy drainage. Definitive PCNL is usually done after infection is controlled. EAU guidance supports urgent decompression in obstructed infected systems and delaying definitive stone treatment until sepsis is controlled.

Benefits of PCNL surgery

The main benefit of PCNL is effective clearance of large kidney stones.

Possible benefits include:

  • Removes large stone burden directly.
  • Useful for staghorn and complex stones.
  • May reduce the need for multiple procedures.
  • Helps treat obstruction and infection source.
  • Avoids open stone surgery in most patients.
  • Allows stone analysis for recurrence prevention.
  • Can protect kidney function when obstruction or infection is present.

Open stone surgery is now rarely required because endoscopic options such as PCNL, RIRS and URSL are available. EAU guidance reserves open or laparoscopic stone surgery for selected situations where endoscopic options fail or are unlikely to work.

Risks and possible complications

PCNL is effective, but it is still a kidney operation. Risks vary depending on stone size, infection, number of punctures, kidney anatomy, blood thinners and overall health.

Possible risks include:

  • Blood in urine.
  • Bleeding requiring transfusion.
  • Fever or infection.
  • Sepsis, especially with infected stones.
  • Urine leak.
  • Residual stone fragments.
  • Need for second sitting, RIRS, URSL or ESWL.
  • DJ stent discomfort.
  • Nephrostomy tube discomfort.
  • Injury to nearby organs, rarely bowel, lung lining, liver or spleen depending on anatomy.
  • Anaesthesia-related risks.

EAU lists fever, bleeding, sepsis, thoracic complications, organ injury and urinoma among recognised PCNL complications. It also notes that stone culture or renal pelvic urine culture may better predict post-PCNL infection than midstream urine culture alone.

Recovery after PCNL surgery

Recovery depends on stone size, infection, bleeding, number of punctures, residual fragments, stent symptoms and general health.

Time after PCNL What you may experience
First 24 hours Monitoring of pain, urine colour, fever, blood pressure, urine output and blood tests
1-3 days Many patients stay in hospital; catheter or nephrostomy tube may be removed depending on recovery
First week Mild blood in urine, tiredness, flank discomfort and stent symptoms may occur
1-2 weeks Many patients return to light work if comfortable
3-4 weeks Gradual return to heavy work, exercise or travel after urologist approval
Follow-up Imaging to check residual fragments; DJ stent removal if placed

Do not lift heavy weights, do strenuous exercise, restart blood thinners or travel long distances unless your treating doctor has advised it.

Emergency warning signs after PCNL

Seek urgent medical care if you have:

  • Fever, chills or shivering.
  • Severe flank pain not improving with medicines.
  • Inability to pass urine.
  • Thick blood clots in urine.
  • Persistent vomiting.
  • Dizziness, fainting or severe weakness.
  • Nephrostomy tube stops draining or comes out.
  • Breathlessness or chest pain.
  • Worsening burning urination with fever.

Fever after kidney stone surgery should never be ignored, especially if a DJ stent, catheter or nephrostomy tube is present.

Follow-up after PCNL

Follow-up is important because PCNL removes the current stone, but it does not remove the tendency to form stones.

Your urologist may advise:

  • USG KUB or CT KUB to check residual fragments.
  • X-ray KUB if the stone is visible on X-ray.
  • DJ stent removal if placed.
  • Urine culture if infection was present.
  • Serum creatinine to check kidney function.
  • Stone analysis.
  • Metabolic evaluation in recurrent, bilateral, multiple or high-risk stone formers.
  • Diet and fluid advice based on stone type.

NIDDK advises that kidney stone prevention depends on stone type and may involve changes in fluid intake, sodium, animal protein, calcium or oxalate intake.

What to bring for consultation

Please bring:

  • CT KUB film and report.
  • USG KUB report.
  • X-ray KUB if done.
  • Urine routine and urine culture.
  • Serum creatinine and kidney function tests.
  • CBC and coagulation profile if available.
  • Blood sugar and BP records.
  • Previous stone surgery records.
  • DJ stent or nephrostomy details if present.
  • Current medicines, especially blood thinners, diabetes medicines, BP medicines and antibiotics.
  • Fever or urine infection records.
  • Previous stone analysis report if available.

FAQs about PCNL surgery for large kidney stone

Is PCNL surgery for large kidney stone safe?

PCNL is a commonly performed and effective surgery for large kidney stones, but it has risks such as bleeding, fever, infection, residual fragments and need for additional procedures. Safety depends on CT planning, urine culture, anaesthesia fitness and careful post-operative monitoring.

What stone size usually needs PCNL?

PCNL is commonly considered for kidney stones larger than 2 cm, staghorn stones and complex stones. Some smaller stones may also need PCNL depending on location, hardness, kidney anatomy and previous failed treatment.

Is PCNL better than RIRS?

For many stones larger than 2 cm, PCNL gives better single-sitting clearance. RIRS may be preferred in selected patients who are not suitable for PCNL, but larger stones often need staged RIRS.

Is PCNL better than ESWL?

For large kidney stones, PCNL is usually more effective than ESWL. ESWL may need multiple sittings and may leave fragments, especially in large, hard or lower pole stones.

Will I have a DJ stent after PCNL?

You may or may not need a DJ stent. It depends on swelling, bleeding, residual fragments, infection risk, urine drainage and intraoperative findings.

Will I have a nephrostomy tube after PCNL?

Some patients need a nephrostomy tube temporarily. In uncomplicated cases, tubeless PCNL may be possible, but this decision is made during surgery.

How long is hospital stay after PCNL?

Many patients stay for around 2-3 days, but stay can be longer if there is infection, bleeding, large stone burden, nephrostomy tube, residual stone or medical comorbidity.

Can large kidney stones come back after PCNL?

Yes. PCNL removes the current stone, but it does not remove the tendency to form stones. Stone analysis, fluid intake, diet changes and metabolic evaluation help reduce recurrence risk.

Related reading

References

Note: This information is for educational purposes only and is not a substitute for medical advice. Please consult your doctor for any symptoms.