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URSL vs RIRS: Which Is Better?

URSL vs RIRS: Which Is Better?

📖 8 min read Written/reviewed by Dr. Alhad Naragude, MBBS, MS, DrNB Urology Last updated: June 23, 2026

URSL vs RIRS is not about which surgery is universally better. URSL is usually better for stones stuck in the ureter, the tube between the kidney and bladder. RIRS is usually better for stones inside the kidney. Both are laser stone surgeries done through the natural urine passage, usually without any skin cut. The right choice depends on stone location, size, CT KUB findings, infection, kidney swelling, anatomy and patient factors.

URSL vs RIRS: quick comparison

Point URSL RIRS
Full form Ureteroscopic lithotripsy Retrograde intrarenal surgery
Common use Ureteric stone surgery Kidney stone surgery
Scope used Usually semi-rigid ureteroscope Flexible ureteroscope
Route Urine passage -> bladder -> ureter Urine passage -> bladder -> ureter -> kidney
Skin cut No No
Laser used Usually yes Usually yes
Best for Lower, mid and selected upper ureter stones Small to medium kidney stones
Can inspect kidney calyces? Limited Yes, better
DJ stent Often needed Often needed
Cost Usually lower Usually higher
Main limitation Not ideal for most kidney stones Not ideal for very large stone burden

BAUS explains that ureteroscopy uses a semi-rigid or flexible telescope passed through the urethra and bladder to fragment or remove stones from the ureter or kidney. It also notes that a semi-rigid ureteroscope is commonly used for ureteric stones, while a flexible ureteroscope is used for kidney stones.

What is URSL?

URSL means ureteroscopic lithotripsy. It is a procedure used mainly for stones in the ureter. The ureter is the narrow tube that drains urine from the kidney into the bladder. When a stone gets stuck in this tube, it can cause severe flank pain, vomiting, blood in urine, burning urination, hydronephrosis [swelling of the kidney due to blockage] or infection.

In URSL, the urologist passes a thin telescope through the natural urine passage into the bladder and then into the ureter. The stone is seen directly and broken using laser energy. Small pieces may be removed with a basket or allowed to pass in urine.

What is RIRS?

RIRS means retrograde intrarenal surgery. “Retrograde” means going from below upward through the urine passage. “Intrarenal” means inside the kidney.

In RIRS, the urologist uses a flexible ureteroscope that can bend inside the kidney. This helps the surgeon reach stones in the renal pelvis or calyces [small urine-collecting chambers inside the kidney]. The stone is usually dusted or broken using a laser.

RIRS is commonly considered for small to medium kidney stones when a no-cut endoscopic option is suitable.

URSL vs RIRS: which is better?

The simplest answer is: URSL is usually better for ureteric stones. RIRS is usually better for kidney stones.

The most important question is not “Which is the latest surgery?” but “Where is the stone?” If the stone is stuck in the ureter, URSL is usually more direct. If the stone is inside the kidney, RIRS usually gives better access because the flexible scope can bend inside the kidney.

NIDDK explains that kidney stone treatment is usually based on stone size, location and type. During ureteroscopy, a doctor passes a ureteroscope through the urethra to see the ureter and kidney, and once the stone is found, it can be removed or broken into smaller pieces.

When is URSL usually preferred?

URSL is commonly preferred when the stone is in the ureter, especially:

  • Lower ureteric stone near the bladder.
  • Mid-ureteric stone.
  • Selected upper ureteric stone.
  • Ureteric stone causing repeated severe pain.
  • Ureteric stone causing hydronephrosis.
  • Stone not passing with medicines.
  • Stone causing persistent vomiting or repeated emergency visits.
  • Stone unlikely to pass naturally due to size or location.

For many lower and mid-ureteric stones needing surgery, URSL is practical, direct and effective.

When is RIRS usually preferred?

RIRS is commonly preferred when the stone is inside the kidney, especially:

  • Renal pelvis stone.
  • Upper calyx stone.
  • Middle calyx stone.
  • Selected lower pole kidney stone.
  • Multiple small kidney stones.
  • Residual kidney stone after previous treatment.
  • Kidney stone where ESWL is less suitable.
  • Patient wants a no-cut option and stone size is appropriate.

RIRS is not the best option for every kidney stone. For stones larger than 2 cm, PCNL is commonly preferred as the first-line option. The EAU guideline recommends PCNL as first-line treatment for renal stones larger than 2 cm, while flexible ureteroscopy or SWL may be considered when PCNL is not an option, with a higher chance of needing a follow-up procedure or stent.

URSL vs RIRS by stone location

Lower ureteric stone

For a stone near the bladder, URSL is usually preferred if surgery is needed. It gives direct access to the stone.

Mid-ureteric stone

URSL is usually the preferred surgical option when observation or medicines are not suitable.

Upper ureteric stone

URSL, flexible ureteroscopy/RIRS, ESWL or another approach may be considered. The decision depends on stone size, impaction, hydronephrosis, infection and whether the stone moves back into the kidney.

Kidney stone

RIRS is usually better than URSL for kidney stones because a flexible scope can inspect the kidney more completely.

Large kidney stone

For large kidney stones, especially more than 2 cm, PCNL or mini-PCNL may be better than RIRS. The EAU guideline states that retrograde renal surgery cannot be recommended as first-line treatment for uncomplicated stones above 20 mm because stone-free rates decrease and staged procedures are often required.

Practical examples

Situation Common practical approach
6 mm lower ureter stone May pass naturally in selected patients. If pain, obstruction, infection or failure to pass occurs, URSL may be advised.
9 mm mid-ureter stone URSL is commonly preferred if active treatment is needed.
10 mm upper ureter stone URSL or flexible ureteroscopy/RIRS may be considered depending on position, impaction and CT findings.
12 mm kidney stone RIRS may be suitable if location and anatomy are favourable. ESWL or mini-PCNL may also be discussed in selected cases.
18 mm lower pole kidney stone RIRS or mini-PCNL may be considered. Lower pole anatomy matters because fragments may not clear easily.
25 mm kidney stone PCNL or mini-PCNL is often more suitable than RIRS as the first option, depending on stone burden and anatomy.

How URSL and RIRS are done

Both procedures are usually done under anaesthesia. The usual steps are:

  • A telescope is passed through the urine passage.
  • The bladder is entered.
  • The ureter is entered carefully.
  • The stone is located.
  • Laser is used to dust or fragment the stone.
  • Fragments may be removed with a basket.
  • A DJ stent may be placed if needed.

A DJ stent is a temporary soft tube placed between the kidney and bladder. It helps urine drain and allows the ureter to heal. It may cause burning urine, frequent urination, urgency, mild blood in urine or flank discomfort until removal.

Recovery after URSL vs RIRS

Recovery point URSL RIRS
Walking Usually same day Usually same day
Hospital stay Day care or overnight in many cases Day care or overnight in many cases
Burning urine Common for a few days Common for a few days
Blood in urine Mild blood can happen Mild blood can happen
Stent discomfort Common if stent is placed Common if stent is placed
Return to desk work Often within a few days Often within a few days
Heavy exercise Avoid until advised Avoid until advised
Follow-up imaging May be needed Often needed to check residual fragments

Recovery depends on infection, swelling, stone size, surgery duration, stent placement, anaesthesia and overall health.

Risks of URSL and RIRS

Both URSL and RIRS are commonly performed endoscopic procedures, but they are still surgeries. Possible risks include:

  • Fever or urinary infection.
  • Sepsis, especially if infected urine is present.
  • Bleeding in urine.
  • Ureteric injury.
  • Ureteric narrowing later, rarely.
  • Residual stone fragments.
  • Need for a second sitting.
  • Stent discomfort.
  • Failure to reach the stone due to a narrow ureter.
  • Stone migration.
  • Need for temporary drainage before final stone surgery.

Why a DJ stent may be placed before surgery

Sometimes the urologist may not break the stone immediately. Instead, a DJ stent may be placed first. This may be needed if:

  • There is fever or infection.
  • The kidney is obstructed and swollen.
  • The ureter is too narrow.
  • The patient is unwell.
  • Kidney function is affected.
  • The operation may be safer after drainage.
  • There is pus or infected urine.

In an infected blocked kidney, drainage is more urgent than stone removal. The EAU guideline states that an obstructed kidney with signs of UTI or anuria is a urological emergency and may need urgent decompression using a ureteral stent or nephrostomy, with definitive stone treatment delayed until sepsis resolves.

When urgent care is needed

Seek urgent medical care if you have:

  • Fever with chills.
  • Severe flank pain not settling with medicines.
  • Vomiting and inability to drink fluids.
  • Inability to pass urine.
  • Heavy blood clots in urine.
  • Reduced urine output.
  • Stone pain with diabetes.
  • Stone pain with a single kidney.
  • Stone pain with known kidney failure.
  • Worsening pain after stent placement.
  • Confusion, severe weakness or low blood pressure symptoms.

A stone with fever should be treated as urgent.

Cost difference: URSL vs RIRS

URSL is usually less expensive than RIRS because the instruments are simpler and the stone is often more directly accessible.

RIRS usually costs more because it uses a flexible ureteroscope, laser fibre, guidewires, access sheath in selected cases and delicate instruments.

But cost should not be the only deciding factor. The wrong procedure for the wrong stone can lead to incomplete clearance, repeat surgery or avoidable risk.

How a urologist decides between URSL and RIRS

A urologist usually reviews:

  • CT KUB film and report.
  • Stone size in mm.
  • Exact stone location.
  • Stone density, if mentioned.
  • Hydronephrosis.
  • Kidney function.
  • Urine infection.
  • Number of stones.
  • Lower pole anatomy.
  • Previous DJ stent.
  • Previous stone surgery.
  • Pain severity.
  • Fever or sepsis risk.
  • Patient’s work, travel and personal preferences.

Consultation checklist

Bring these to your visit:

  • CT KUB film and report.
  • USG KUB report, if done.
  • Urine routine/microscopy.
  • Urine culture, especially if fever or burning urine is present.
  • Serum creatinine.
  • CBC, if available.
  • Previous discharge summary.
  • Previous DJ stent details, if any.
  • Current medicines.
  • Blood thinner details, if any.
  • Diabetes, BP, heart or kidney disease reports.

FAQs

Is RIRS better than URSL?

RIRS is better for many kidney stones. URSL is better for many ureteric stones. The better surgery depends mainly on where the stone is located.

Is URSL the same as RIRS?

No. Both are endoscopic laser stone surgeries, but URSL is usually used for ureteric stones, while RIRS uses a flexible scope to treat stones inside the kidney.

Which is better for ureteric stone?

URSL is usually better for lower and mid-ureteric stones if surgery is needed. For selected upper ureteric stones, flexible ureteroscopy/RIRS or another approach may be considered.

Which is better for kidney stone?

RIRS is usually better for small to medium kidney stones. Large kidney stones, especially more than 2 cm, often need PCNL or mini-PCNL.

Can URSL treat kidney stones?

A semi-rigid URSL scope is not ideal for most kidney stones because it cannot bend into all kidney areas. RIRS is usually better for stones inside the kidney.

Is RIRS more advanced than URSL?

RIRS uses a flexible scope and is technically more advanced, but that does not mean it is always the better choice. For a simple lower ureteric stone, URSL may be more appropriate.

Will I need a DJ stent after URSL or RIRS?

Many patients need a temporary DJ stent after URSL or RIRS. The need depends on swelling, infection risk, stone size, ureter condition, residual fragments and operative findings.

Why did my doctor place a stent first instead of removing the stone?

This may happen if there is infection, pus, severe swelling, narrow ureter or unsafe conditions for laser stone surgery. Definitive stone surgery may be planned after stabilization.

Can stones come back after URSL or RIRS?

Yes. URSL and RIRS remove the current stone but do not remove the tendency to form stones. Fluid intake, diet changes, stone analysis and metabolic evaluation may be needed.

Which is less painful: URSL or RIRS?

Both are done under anaesthesia. After surgery, discomfort is usually due to the DJ stent, burning urine or mild ureter swelling. Pain varies from patient to patient.

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.