PCNL – Large Kidney Stone Surgery

PCNL stands for percutaneous nephrolithotomy. It is a surgical procedure used to remove stones directly from the kidney through a small opening in the back or flank.

PCNL is often described as keyhole kidney stone surgery, but it is still a significant operation. Instruments pass directly through kidney tissue, and bleeding, infection and injury are important potential risks.

PCNL is generally recommended as first-line treatment for kidney stones larger than 2 cm when active removal is appropriate. It may also be suitable for certain smaller, difficult stones depending on anatomy.

A staghorn stone is a large stone that branches into multiple parts of the kidney's urine-collecting system. These stones can be complex and may require PCNL, sometimes in stages.

PCNL is routinely performed under general anaesthesia, meaning you are asleep during the operation. Your anaesthetist will explain the relevant anaesthetic risks.

Both supine (face-up) and prone (face-down) approaches are used. Both are established techniques. The position depends on your anatomy, medical circumstances and the planned operation.

Many procedures take approximately one to three hours, although surgery can take longer for very large or complex stones. Anaesthesia and recovery add to the total time in hospital.

PCNL uses a small skin opening to create a channel into the kidney. The size depends on whether standard or smaller PCNL instruments are used. More than one access point may occasionally be necessary.

Mini-PCNL uses a smaller working channel and instruments than standard PCNL. It may offer advantages in selected patients, but is not automatically the best option for every stone.

PCNL is effective for large kidney stones, but complete clearance cannot be guaranteed. Complex staghorn stones or difficult anatomy may require more than one procedure.

Not always. Some patients require an external nephrostomy tube after PCNL, while selected uncomplicated procedures can be performed without one. The decision depends on bleeding, drainage and operative findings.

A nephrostomy is a tube that exits through the back and drains urine into a bag. A ureteric stent is an internal tube between the kidney and bladder. Either or both may be used following PCNL.

Many patients remain in hospital for one or two nights. Some require a longer stay, particularly after extensive surgery or complications. Selected patients may be suitable for earlier discharge.

A small amount of blood in the urine can occur during healing. Heavy bleeding, increasing blood loss, clots, dizziness or worsening pain require urgent medical assessment.

Yes. PCNL involves accessing the kidney directly, so bleeding is a recognised complication. Occasionally a transfusion or an interventional radiology procedure is needed to control bleeding. Serious bleeding can also occur after discharge.

Yes. Urinary infection and sepsis are recognised risks of PCNL. Stones themselves may contain bacteria. Fever, shaking chills or feeling seriously unwell after surgery requires urgent medical assessment.

Kidney function is considered before and after surgery. Removing stones and obstruction may help protect kidney health, but bleeding, infection or other complications can occasionally affect kidney function.

Return to work depends on recovery and physical demands. Some patients return to desk-based work after approximately one to two weeks. Heavy physical work may require more time.

Gentle walking is commonly encouraged during recovery. Heavy lifting, running and strenuous activity may need to be avoided for several weeks, sometimes around four to six weeks or longer. Follow your surgeon's instructions.

Driving is not permitted immediately after general anaesthesia. You should only resume when you are comfortable, no longer affected by sedating medication, able to perform an emergency stop, and cleared according to hospital instructions.

PCNL is often preferred for larger stone burdens because it allows direct removal of fragments. Ureteroscopy avoids a skin access tract and may be more appropriate for smaller stones or selected patients. Each has different benefits and risks.

PCNL primarily treats stones within the kidney. Some large, impacted or difficult upper ureteric stones may also be approached through a percutaneous route in selected cases. Standard ureteroscopy is more commonly used for ureteric stones.

Yes. PCNL removes existing stones but does not eliminate the underlying tendency to form new stones. Follow-up imaging, stone analysis and prevention measures may reduce recurrence.

Selected patients, particularly recurrent or high-risk stone formers, benefit from a metabolic assessment including 24-hour urine testing. Your urologist will recommend testing according to stone composition and individual risk.

Bring your GP referral, medication list, recent CT or ultrasound reports, imaging if available, kidney function and urine results, previous stone analysis and operation reports.