RIRS Surgery for Kidney Stone
RIRS surgery for kidney stone is a no-cut laser procedure used to treat selected stones inside the kidney. A thin flexible camera is passed through the urine passage, bladder and ureter into the kidney. The stone is broken with laser into dust or small fragments. RIRS is commonly useful for small-to-medium kidney stones, selected lower pole stones, hard stones, painful stones, growing stones or stones not cleared after ESWL. For very large stones, especially above 2 cm, PCNL is often better because it usually clears larger stone burden more effectively.
What is RIRS surgery?
RIRS means Retrograde Intrarenal Surgery.
“Retrograde” means the surgeon reaches the kidney from below, through the natural urine passage. “Intrarenal” means inside the kidney.
In simple words, RIRS is flexible ureteroscopy with laser stone surgery inside the kidney. There is usually no skin cut, no puncture in the back and no external wound.
The route is: urine passage → bladder → ureter → kidney.
NIDDK describes ureteroscopy as a procedure where a thin scope is passed through the urethra and bladder into the ureter or kidney. Once a stone is found, it can be removed or broken into smaller pieces.
When is RIRS surgery needed for kidney stones?
Not every kidney stone needs surgery. Some small, silent stones can be observed with follow-up. RIRS may be advised when the stone is causing symptoms or is likely to create future problems.
| Situation | Why RIRS may be considered |
|---|---|
| Repeated kidney stone pain | To clear the stone causing attacks |
| Kidney swelling / hydronephrosis | To relieve blockage or prevent kidney damage |
| Stone not passing naturally | Kidney stones usually do not pass easily once they are inside the kidney |
| Failed ESWL | RIRS gives direct laser treatment |
| Lower pole kidney stone | ESWL fragments may not clear well from the lower calyx |
| Hard stone on CT scan | Laser may work better than shock waves |
| Growing stone | Prevents future pain, blockage or infection |
| Patient wants definitive treatment | Useful before travel, important work or repeated colic episodes |
EAU guidance lists stone growth, new obstruction, infection and acute or chronic pain as indications for active treatment of renal stones.
Who is a good candidate for RIRS?
RIRS is commonly suitable for:
- Kidney stones less than 2 cm.
- Selected stones between 1 and 2 cm.
- Lower pole stones where ESWL may not clear well.
- Stones not cleared after ESWL.
- Multiple small stones in one kidney.
- Patients who prefer a no-cut approach.
- Patients where bleeding risk makes PCNL less suitable.
- Patients with obesity or long skin-to-stone distance where ESWL may be less effective.
EAU notes that for stones in the renal pelvis or upper/middle calyces, SWL, PCNL and RIRS are all treatment options, but stone-free rates after SWL or URS reduce as stone size increases.
Who may not be ideal for RIRS?
RIRS is excellent for selected stones, but it is not the best surgery for every patient.
RIRS may not be ideal for:
- Very large stone burden.
- Staghorn stone.
- Multiple large stones in different calyces.
- Stones above 2 cm where one-sitting clearance is important.
- Active infection with obstruction.
- Very tight ureter where the scope cannot pass safely.
- Difficult lower pole anatomy.
- Patients who cannot return for stent removal or second sitting.
For stones above 20 mm, EAU recommends PCNL as the primary treatment because SWL may need multiple sessions and RIRS stone-free rates reduce, often requiring staged procedures.
RIRS vs ESWL vs PCNL: which is better?
| Treatment | How it works | Best suited for | Main limitation |
|---|---|---|---|
| RIRS | Flexible camera through urine passage + laser | Small-to-medium kidney stones, selected lower pole stones | May need DJ stent; large stones may need staged surgery |
| ESWL / SWL | Shock waves from outside the body | Selected small stones | Fragments must pass naturally; lower pole clearance may be poor |
| PCNL / Mini-PCNL | Small puncture from the back into the kidney | Large, hard or complex kidney stones | More invasive; higher bleeding risk and longer stay than RIRS in many cases |
For 10-20 mm stones, mini-PCNL may give a higher stone-free rate than RIRS or SWL, but it carries higher bleeding risk and longer hospital stay. For lower pole stones, EAU notes that SWL clearance may be lower because fragments can remain in the lower calyx.
How is RIRS surgery done?
RIRS is performed in an operation theatre under anaesthesia.
Before surgery
Your urologist usually reviews:
- CT KUB.
- USG KUB, if already done.
- Urine routine.
- Urine culture.
- Serum creatinine.
- CBC and basic blood tests.
- Diabetes and BP status.
- Blood thinner history.
- Anaesthesia fitness.
If urine culture shows infection, antibiotics are usually needed before surgery. If there is infection with an obstructed kidney, urgent drainage with a DJ stent or nephrostomy may be needed before definitive stone surgery. EAU describes an infected obstructed kidney as a urological emergency.
During surgery
The usual steps are:
- Anaesthesia is given.
- A small camera is passed through the urine passage into the bladder.
- The ureteric opening is identified.
- A guidewire is passed up to the kidney.
- A flexible ureteroscope is passed into the kidney.
- The stone is seen directly.
- Laser is used to break the stone into dust or small pieces.
- Some fragments may be removed with a tiny basket.
- A DJ stent may be placed to keep urine drainage smooth.
Sometimes the ureter is too narrow for safe access. In that case, the surgeon may place a DJ stent first and do RIRS after a few days or weeks. This is called pre-stenting. It is a safety step, not a failed surgery.
What does the laser do?
The laser breaks the stone into very small particles. There are two common strategies:
Dusting
The stone is converted into fine dust-like particles that pass gradually in urine.
Fragmentation and basketing
The stone is broken into small pieces, and selected pieces are removed using a basket.
The choice depends on stone size, hardness, visibility, kidney anatomy and surgeon preference.
Will I need a DJ stent after RIRS?
Many patients need a temporary DJ stent after RIRS.
A DJ stent is a soft internal tube placed from the kidney to the bladder. It keeps urine flowing while the ureter settles after surgery. NIDDK notes that a ureteral stent may be left after stone procedures to help urine flow or help stone fragments pass.
Common DJ stent symptoms include:
- Frequent urination.
- Urgency.
- Burning while passing urine.
- Mild blood in urine.
- Side pain while passing urine.
- Bladder discomfort.
These symptoms are common and usually improve after stent removal. NIDDK also notes that a stent can cause kidney or bladder discomfort, frequency and urgency while it remains in place.
How long does the DJ stent stay?
The stent may stay for a few days to a few weeks, depending on stone size, ureter swelling, infection risk and the surgeon’s plan. NIDDK states that a ureteral stent may be left for a few days to a week or more and may need cystoscopic removal.
The most important instruction is simple: do not forget the stent.
A forgotten stent can develop stone coating, infection and can become difficult to remove.
Hospital stay after RIRS
Many patients go home the same day or the next day. NIDDK notes that ureteroscopy is done in hospital with anaesthesia and patients can typically go home the same day, depending on the procedure and recovery.
Hospital stay may be longer if there is:
- Fever.
- Large stone burden.
- Diabetes.
- Kidney function concern.
- Solitary kidney.
- Bleeding.
- Previous infection.
- Need for close monitoring.
Recovery after RIRS surgery
First 24-48 hours
You may have:
- Mild burning urine.
- Mild blood in urine.
- Frequent urination.
- Flank discomfort.
- Stent-related urgency.
- Tiredness due to anaesthesia.
NIDDK lists mild burning, small amounts of blood in urine, bladder or kidney discomfort and increased frequency or urgency as possible symptoms after cystoscopy or ureteroscopy.
First week
Most patients can do light daily activities within a few days. Avoid heavy lifting, strenuous exercise, cycling, long travel and dehydration until your urologist clears you.
After stent removal
Frequency, urgency and side pain usually improve after stent removal. Mild burning for one or two days can happen. Follow-up imaging may be advised to check for residual fragments or kidney swelling.
Benefits of RIRS surgery for kidney stone
RIRS may offer:
- No skin cut.
- No puncture in the back.
- Less bleeding risk than PCNL.
- Shorter hospital stay in many selected cases.
- Direct laser treatment.
- Useful option after failed ESWL.
- Useful for selected lower pole stones.
- Faster return to routine activity compared with more invasive surgery.
However, RIRS should not be selected only because it sounds modern. The best surgery is the one that clears the stone safely with the least overall risk.
Risks and possible complications
Possible risks include:
- Fever.
- Urine infection.
- Sepsis, rarely.
- Blood in urine.
- Ureter injury.
- Ureter narrowing later.
- Severe stent discomfort.
- Residual stone fragments.
- Need for second sitting.
- Inability to reach the stone if ureter is narrow.
- Anaesthesia-related risks.
NIDDK lists UTI, bleeding, pain, inability to urinate, injury to the urinary tract and anaesthesia-related issues as possible risks after cystoscopy or ureteroscopy.
Red flags after RIRS: seek urgent care
Contact your urologist or seek urgent medical care if you have:
- Fever or chills.
- Severe pain not settling with medicines.
- Vomiting and dehydration.
- Inability to pass urine.
- Thick blood clots in urine.
- Worsening burning with fever.
- Very low urine output.
- Dizziness or weakness.
- Severe stent pain that is not manageable.
NIDDK advises urgent care after ureteroscopy if a patient cannot urinate, has fever or chills, severe discomfort, bright red urine or clots.
How to prevent stones after RIRS
RIRS removes the present stone. It does not remove the tendency to form stones.
Prevention may include:
- Drinking enough water to keep urine pale.
- Reducing excess salt.
- Avoiding very high animal-protein intake.
- Not stopping dietary calcium unless advised.
- Treating recurrent urine infection.
- Stone analysis, if fragments are available.
- 24-hour urine testing in recurrent stone formers.
NIDDK states that drinking enough liquids is one of the best ways to prevent most kidney stones and that prevention depends on knowing the stone type.
What to bring for consultation
Bring:
- CT KUB film and report.
- USG KUB report.
- Urine routine report.
- Urine culture report.
- Serum creatinine.
- CBC and other blood tests.
- Current medicines.
- Blood thinner details.
- Diabetes and BP reports.
- Previous discharge summaries.
- Previous stone surgery records.
- Old stone analysis report, if available.
Questions to ask your urologist
- Is my stone suitable for RIRS?
- What is my stone size and location?
- Is it a lower pole stone?
- Is the stone hard on CT scan?
- Do I need urine culture before surgery?
- Is PCNL better for my stone?
- Will I need a DJ stent?
- When will the stent be removed?
- What are the chances of residual fragments?
- Could I need a second sitting?
- When can I return to work, travel, exercise and sex?
- How do I prevent another stone?
FAQs about RIRS surgery for kidney stone
Is RIRS surgery painful?
RIRS is done under anaesthesia, so you should not feel pain during surgery. After surgery, mild burning urine, blood in urine, frequent urination and stent discomfort can happen.
Is RIRS really a no-cut kidney stone surgery?
Yes. RIRS is usually done through the natural urine passage without a skin cut. The flexible scope passes through the urethra, bladder and ureter into the kidney.
Which stone size is best for RIRS?
RIRS is commonly used for small-to-medium kidney stones, especially stones below 2 cm. Larger stones may need PCNL or staged RIRS depending on the case.
Is RIRS better than PCNL?
RIRS is less invasive and avoids a back puncture. PCNL usually clears larger stones better, especially stones above 2 cm. The better option depends on stone size, location, hardness, kidney anatomy and infection status.
Is RIRS better than ESWL?
RIRS gives direct laser treatment. ESWL breaks the stone from outside, and the fragments must pass naturally. RIRS may be better for hard stones, failed ESWL and selected lower pole stones. ESWL may still be suitable for selected small stones.
Will I need a DJ stent after RIRS?
Many patients need a temporary DJ stent after RIRS. It helps urine drain while swelling settles. Stent symptoms are common but usually temporary.
Can RIRS fail?
Yes. RIRS may not fully clear very large stones, very hard stones, difficult lower pole stones or stones in difficult anatomy. Sometimes the ureter is too narrow and pre-stenting is needed before definitive surgery.
When can I return to work after RIRS?
Many patients return to light work within a few days, depending on pain, stent symptoms and the nature of work. Heavy physical activity should wait until your urologist clears you.
Related reading
- Laser Treatment for Kidney Stone
- Lower Pole Kidney Stone Treatment: ESWL, RIRS or PCNL?
- PCNL Surgery for Large Kidney Stone
- Stone with Urine Infection: Why It Can Be Dangerous
- Calyceal Stone Treatment: Observation, ESWL, RIRS or PCNL?
- Kidney Stone Treatment in Latur
References
- European Association of Urology. EAU Guidelines on Urolithiasis https://uroweb.org/guidelines/urolithiasis/chapter/guidelines
- NIDDK. Cystoscopy & Ureteroscopy https://www.niddk.nih.gov/health-information/diagnostic-tests/cystoscopy-ureteroscopy
- NIDDK. Treatment for Kidney Stones https://www.niddk.nih.gov/health-information/urologic-diseases/kidney-stones/treatment
- Urology Care Foundation. Kidney Stones: Symptoms, Diagnosis & Treatment https://www.urologyhealth.org/urology-a-z/k/kidney-stones
- American Urological Association. Surgical Management of Kidney and Ureteral Stones Guideline https://www.auanet.org/guidelines-and-quality/guidelines/surgical-management-of-kidney-and-ureteral-stones