Mini PCNL Treatment in Singapore

Living with kidney stones can be painful and disruptive to daily life. When larger kidney stones cannot pass naturally or are not amenable to less invasive methods, surgical intervention may be necessary. Mini PCNL (Percutaneous Nephrolithotomy) is a minimally invasive treatment option for removing kidney stones that are too large or complex for other treatments. This procedure offers patients in Singapore a balance between effectiveness and reduced recovery time compared to traditional open surgery. Understanding what Mini PCNL involves and whether you’re a suitable candidate helps you make informed decisions about your kidney stone treatment.

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Dr. Nor Azhari Bin Mohd Zam

MBBS (NUS)|MRCS (Edin.)|MMed Surgery (NUS)|FAMS (Urology)

doctor with kidney adrenal gland anatomy model 2025 03 08 19 14 10 utc Mini PCNL Treatment in Singapore

What is Mini PCNL?

Mini PCNL is a minimally invasive surgical procedure designed to remove kidney stones through a small incision in the back. The “mini” designation refers to the use of smaller instruments and access sheaths compared to standard PCNL, typically instruments between 14 and 20 French in diameter (approximately 4.7-6.7mm). During this procedure, a urologist creates a direct channel from the skin into the kidney, allowing for stone fragmentation and removal under direct visualisation.

This technique may be suitable for kidney stones ranging from 1 to 3 centimetres in size, though it can also address larger or multiple stones, depending on their location and composition. The procedure utilises specialised endoscopic equipment, including a nephroscope (a thin telescope-like instrument) and various stone-fragmentation devices, such as lasers or ultrasonic lithotripters. Mini PCNL bridges the gap between less invasive procedures such as shock wave lithotripsy (ESWL) or ureteroscopy and traditional PCNL, aiming to reduce tissue trauma while maintaining stone clearance rates.

The procedure addresses various types of kidney stones, including calcium oxalate, calcium phosphate, struvite, and uric acid stones. Stone clearance rates with Mini PCNL can vary depending on stone size, location, and composition.

Who is a Suitable Candidate?

Potential Candidates

Potential Candidates

  • Patients with kidney stones between 1-3 cm in diameter
  • Individuals with lower pole kidney stones larger than 1 cm that are unlikely to pass naturally
  • Patients with multiple kidney stones requiring simultaneous removal
  • Those who have not responded to previous treatments such as ESWL, ureteroscopy or renoscopy
  • Individuals with stones causing persistent pain or recurrent urinary tract infections
  • Patients with stones causing kidney obstruction or affecting kidney function
  • Those with complex stone compositions (such as cystine or calcium oxalate monohydrate) are resistant to shock wave therapy
  • Individuals seeking definitive stone removal
Contraindications

Contraindications

  • Active urinary tract infection that hasn’t been adequately treated
  • Uncorrected bleeding disorders or coagulopathy
  • Pregnancy (due to radiation exposure and anaesthesia risks)
  • Severe cardiopulmonary conditions preventing general anaesthesia
  • Anatomical abnormalities preventing safe kidney access
  • Patients on anticoagulation therapy who cannot be safely discontinued
  • Severe obesity that may complicate positioning and access
  • Untreated urosepsis or systemic infection

A thorough evaluation by Dr Azhari is essential to determine if Mini PCNL is appropriate for your specific situation. Your surgeon will consider factors including stone characteristics, kidney anatomy, overall health status, and previous treatment history when recommending the most suitable approach.

Treatment Techniques & Approaches

  • Standard Mini PCNL Technique

    The standard Mini PCNL approach involves creating percutaneous access through a small flank incision, typically 1-2 cm in length. The surgeon uses fluoroscopic or ultrasound guidance to locate the kidney and plan the access point. A needle is inserted through the skin into the kidney’s collecting system, followed by progressive dilation to accommodate the mini nephroscope. This technique allows direct visualisation and stone removal while aiming to minimise tissue trauma compared to conventional PCNL.

  • Tubeless Mini PCNL

    In selected cases, surgeons may perform a “tubeless” Mini PCNL where no nephrostomy tube is left in place after the procedure. This variation may be suitable for patients with minimal bleeding, complete stone clearance, and no significant collecting system perforation. The tubeless approach can potentially reduce post-operative pain and hospital stay duration. A ureteral stent is typically placed to ensure drainage, which is removed after a few days to weeks.

  • Technology & Equipment Used

    Modern Mini PCNL procedures utilise specialised miniaturised instruments including mini nephroscopes with enhanced optics, holmium laser systems for stone fragmentation, and ultrasonic or pneumatic lithotripters for stone breakage. The method employs fluoroscopy or ultrasound for real-time imaging guidance during access creation and stone localisation. Flexible nephroscopes can be used to access stones in difficult-to-reach areas of the kidney. Stone retrieval devices, including baskets and graspers, facilitate fragment removal through the access sheath.

Wondering which approach might suit you?

Dr Azhari will evaluate your specific needs and discuss the available options.

The Treatment Process

Pre-Treatment Preparation

Before your Mini PCNL procedure, you’ll undergo a comprehensive evaluation, including blood tests to assess kidney function and clotting parameters, urine culture to rule out infection, and imaging studies such as a CT scan to map stone location and kidney anatomy. You’ll need to stop blood-thinning medications as advised by your surgeon, typically 5-7 days before the procedure. Antibiotics may be prescribed to prevent infection, starting 1-2 days before surgery. You’ll be instructed to fast from midnight before the procedure. Pre-operative anaesthesia assessment may confirm that you’re fit for general anaesthesia. Arrangements should be made for transportation home and assistance during initial recovery.

During the Procedure

The Mini PCNL procedure begins with general anaesthesia administration and positioning you prone (face-down) or in a modified position for kidney access. A ureteral catheter is first placed through the bladder to the kidney for contrast injection and drainage. With imaging guidance, the urologist inserts a needle through the skin into the target kidney calyx. A guidewire is passed through the needle, and the tract is dilated to accommodate the mini-access sheath. The mini nephroscope is introduced through the sheath, allowing direct visualisation of stones. Stone fragmentation is performed using laser or ultrasonic energy, with fragments removed using graspers or suction. The procedure typically takes 60-120 minutes, depending on stone burden and complexity.

Immediate Post-Treatment

Following the procedure, you’ll recover in the post-anaesthesia care unit, where vital signs and urine output are closely monitored. A nephrostomy tube may be placed through the access tract for drainage, though some patients qualify for tubeless procedures. Initial pain management includes intravenous medications transitioning to oral analgesics. Urine may appear blood-tinged initially, which is normal and typically clears within 24-48 hours. Most patients can start clear liquids shortly after recovering from anaesthesia, progressing to a regular diet as tolerated. Antibiotics will continue to prevent infection, and you’ll be encouraged to move around as soon as it’s safe to do so.

Recovery & Aftercare

First 24-48 Hours

During the initial recovery period, pain at the incision site is managed with prescribed medications, typically improving after the first day. The nephrostomy tube, if placed, remains secured and drains into a collection bag that needs monitoring. You should maintain adequate hydration by drinking 2-3 litres of water daily to help flush the kidneys. Light activities such as walking are encouraged, but heavy lifting and strenuous activities should be avoided. Watch for warning signs, including fever above 38°C, severe pain unresponsive to medication, heavy bleeding, or inability to urinate. Most patients can shower after 24 hours with a waterproof dressing over the incision site.

First Week

Follow-up appointments are scheduled within 3-7 days for wound check and possible nephrostomy tube removal if applicable. The ureteral stent, if placed, typically remains for 1-2 weeks, depending on healing progress. Gradual return to normal daily activities is encouraged, though heavy lifting (over 5kg) should still be avoided. Continue prescribed antibiotics for the full course to prevent infection. Mild discomfort during urination is common when a stent is in place. Imaging studies may be performed to confirm stone clearance and assess kidney drainage. Most patients can return to desk work within 3-5 days, though physical jobs require more prolonged recovery.

Long-term Recovery

Complete healing of the kidney tissue typically occurs within 4-6 weeks. Full return to all activities, including exercise and heavy lifting, is usually possible after 3-4 weeks, as provided by the surgeon. Stone analysis results guide dietary modifications and preventive measures against recurrence. Regular follow-up includes imaging studies at 3-6 months to confirm the absence of residual fragments or new stone formation. Metabolic evaluation may be recommended for recurrent stone formers to identify underlying causes. Long-term preventive strategies include maintaining adequate hydration, dietary modifications based on stone type, and, if indicated, preventive medications.

Dr Azhari provides comprehensive post-procedure support to help in optimal recovery.

Schedule your consultation to learn more about what to expect.

Benefits of Mini PCNL

Mini PCNL offers potential advantages for treating kidney stones that require surgical intervention. The minimally invasive nature means smaller incisions compared to traditional surgery, which may result in less post-operative pain and reduced scarring. Recovery time may be shorter than standard PCNL or open surgery, with most patients returning to normal activities within 2-3 weeks. The procedure can provide stone clearance, particularly for stones between 1 and 3 cm, often achieving clearance in a single session.

Compared to multiple sessions of shock wave lithotripsy or repeated ureteroscopy procedures, Mini PCNL may offer more definitive treatment with predictable outcomes. Direct visualisation enables stone targeting and immediate confirmation of clearance. The procedure may have a lower bleeding risk than standard PCNL. The procedure can effectively treat stones in difficult-to-reach locations, such as lower-pole stones or those within kidney diverticula. Hospital stay is typically just 1-2 days, allowing faster return to work and daily activities. Smaller instruments used in Mini PCNL may result in less kidney trauma than in more invasive approaches.

Risks & Potential Complications

Common Side Effects

Most patients experience mild to moderate pain at the incision site lasting several days, managed with oral pain medications. Blood in the urine (haematuria) is expected initially and typically resolves within 48-72 hours with adequate hydration. Temporary urinary frequency or urgency may occur, particularly if a ureteral stent is placed. Some patients report mild back discomfort when moving, which improves as healing progresses. Constipation from pain medications and reduced activity is common but manageable with stool softeners and increased fluid intake. These effects are temporary and resolve as recovery progresses.

Potential Complications

Though uncommon with experienced surgeons, potential complications include bleeding that may require transfusion, managed through careful technique and monitoring. Infection or sepsis risk is minimised through prophylactic antibiotics and sterile technique. Injury to surrounding organs, such as the colon or lung, is possible and can be prevented through careful imaging-guided access. Incomplete stone clearance may occur, potentially requiring additional procedures. Urine leakage from the kidney may prolong recovery but typically resolves with conservative management. Formation of an arteriovenous fistula is sporadic but may require intervention if persistent.

Dr Azhari utilises careful surgical technique, proper patient selection, and comprehensive pre-operative planning to help minimise these risks. The smaller instruments used in Mini PCNL may inherently reduce complication rates compared to standard PCNL while maintaining effectiveness.

Cost Considerations

The cost of Mini PCNL in Singapore varies based on several factors, including stone size and number, procedure complexity, hospital facility charges, and length of hospital stay. The total fee typically encompasses the surgeon’s fees, anaesthesiologist charges, operating theatre costs, specialised equipment and disposables, hospital room charges, and post-operative care, including medications. Pre-operative investigations, such as CT scans and blood tests, are usually charged separately.

While Mini PCNL may have higher upfront costs than non-surgical treatments, it may prove cost-effective by providing definitive stone removal in a single procedure, avoiding multiple treatment sessions. The shorter hospital stay and faster recovery compared to standard PCNL or open surgery can reduce overall treatment costs and time away from work. Quality of care and surgeon experience can impact outcomes and the potential need for additional procedures.

During your consultation, our clinic will provide a detailed cost breakdown tailored to your specific treatment requirements. We can discuss payment options and help you understand what to expect financially.

Frequently Asked Questions

How long does Mini PCNL surgery take to perform?

Mini PCNL typically takes between 60 and 120 minutes, depending on the size, number, and location of stones. Complex cases with multiple stones or difficult anatomy may require a longer operative time. Your surgeon will provide a more accurate estimate based on your specific situation during the pre-operative consultation. The entire hospital stay usually spans 1-2 days.

Is Mini PCNL painful?

The procedure is performed under general anaesthesia, so you won’t feel pain during surgery. Post-operatively, most patients experience mild to moderate discomfort at the incision site, managed with prescribed pain medications. Pain typically peaks within the first 24 hours and progressively improves. Smaller instruments used in Mini PCNL may result in less postoperative pain than in standard PCNL.

What size kidney stones can Mini PCNL treat?

Mini PCNL may be suitable for kidney stones between 1 and 3 cm in diameter. It can also treat multiple smaller stones or, in some cases, larger stones up to 4 cm in diameter, depending on location and composition. Your urologist will assess whether Mini PCNL is suitable based on stone characteristics visible on CT imaging. For huge stones (>3-4 cm), standard PCNL or staged procedures may be recommended.

How soon can I return to work after Mini PCNL?

Most patients with desk jobs can return to work within 3-5 days after Mini PCNL. Those with physically demanding occupations typically need 2-3 weeks to resume complete duties. Recovery varies based on individual healing, the presence of complications, and whether a nephrostomy tube was placed. Your surgeon will provide specific return-to-work guidance based on your job requirements and recovery progress.

What are the stone clearance rates of Mini PCNL?

Stone clearance rates with Mini PCNL can vary for appropriately selected cases. Success depends on factors including stone size, location, composition, and kidney anatomy. Lower-pole stones and more complex compositions may have different clearance rates. Your urologist will discuss expected outcomes based on your specific stone characteristics during consultation.

Will I need a catheter after Mini PCNL?

A urinary bladder catheter is usually placed during surgery but typically removed within 24 hours. Some patients have a nephrostomy tube (kidney drainage tube) placed through the incision for 1-2 days, though “tubeless” procedures are possible in uncomplicated cases. A ureteral stent may be left temporarily to ensure proper kidney drainage and removed in the clinic after 1-2 weeks.

Can kidney stones come back after Mini PCNL?

Mini PCNL removes existing stones but doesn’t prevent new stone formation. Recurrence rates vary depending on underlying causes. Stone analysis and metabolic evaluation help identify risk factors. Preventive measures, including hydration, dietary modifications, and, in some cases, medications, can help reduce the risk of recurrence. Regular monitoring helps detect new stones early when they’re easier to treat.

How does Mini PCNL compare to laser ureteroscopy?

Mini PCNL may be preferred for larger kidney stones (>2 cm) or lower pole stones >1 cm, potentially offering single-session clearance rates. Ureteroscopy is effective for smaller stones and doesn’t require a skin incision, but may require multiple sessions for larger stones. Mini PCNL has different risk profiles but may provide more definitive treatment for appropriate cases. Your urologist will recommend the most suitable option based on your stone characteristics.

Conclusion

Mini PCNL represents an advancement in kidney stone treatment, offering a treatment option for stones that are too large or complex for less invasive methods while avoiding the morbidity of open surgery. The procedure can achieve stone clearance rates and relatively quick recovery times, making it a valuable option for patients seeking definitive stone removal. With proper patient selection and experienced surgical technique, Mini PCNL can provide outcomes with manageable risks. If you’re dealing with kidney stones that haven’t responded to other treatments or require surgical intervention, consulting with a qualified urologist can help determine if Mini PCNL is the right choice for your situation.

Ready to Take the Next Step?

If you’re considering Mini PCNL for kidney stone treatment, Dr Azhari can help you determine whether it’s suitable for your needs. With experience in Mini PCNL procedures, we provide personalised care throughout your journey.

Dr. Nor Azhari Bin Mohd Zam

Dr. Nor Azhari Bin Mohd Zam

MBBS (NUS)|MRCS (Edin.)|MMed Surgery (NUS)|FAMS (Urology)

With more than 15 years experience as a certified Urologist, Dr Nor Azhari specializes in treating a wide range of kidney, bladder and prostate conditions as well as disorders of the male reproductive organs.

He offers minimally invasive treatment options and provides same-day appointments for convenience.

  • Skilled urologist and kidney stone surgeon.
  • Director of Endourology (Urinary stone service) at Singapore General Hospital – 2016 to 2023.
  • Recognized with the College of Surgeons Gold Medal and Singapore Urological Association Book prize.
  • Minimally invasive treatment options available (non-invasive and endoscopic/key-hole techniques).

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