A 1 cm kidney stone, also called a 10 mm kidney stone, usually needs evaluation by a urologist because it is less likely to pass naturally than smaller stones. The best treatment for 1 cm kidney stone depends on the stone’s exact location, pain, infection, kidney swelling, stone hardness on CT scan and your overall health. Some silent non-blocking stones can be monitored, but many symptomatic 1 cm stones need treatment such as ESWL, RIRS/flexible ureteroscopy with laser, or sometimes mini-PCNL.

Short answer: What is the best treatment for 1 cm kidney stone?

There is no single best treatment for every 1 cm kidney stone. For most patients, the decision looks like this:

The EAU guidelines classify stones by size, location, X-ray appearance, cause, composition and recurrence risk. They also use size groups such as 5-10 mm, 10-20 mm and more than 20 mm for treatment planning. A 1 cm stone sits at the important border between smaller and moderate-sized stones.

Is a 1 cm kidney stone big?

Yes. A 1 cm kidney stone is a significant stone.

It may not always be an emergency, but it should not be ignored. A 1 cm stone may:

• Stay silent inside the kidney.
• Move into the ureter and cause severe pain.
• Block urine drainage from the kidney.
• Cause swelling of the kidney.
• Trigger urinary infection.
• Grow larger over time.
• Need a more invasive procedure if delayed too long.

The concern is not just the size. A 1 cm stone in the lower pole behaves differently from a 1 cm stone in the renal pelvis. A 1 cm stone inside the kidney behaves differently from a 1 cm stone stuck in the ureter.

Can a 1 cm kidney stone pass naturally?

A true 1 cm kidney stone has a low chance of passing naturally, especially if it moves into the ureter.

Small stones may pass without surgery, but larger stones, stones causing obstruction, severe pain, vomiting or dehydration may need urgent treatment. NIDDK notes that kidney stone treatment depends on stone size, location and type, and that larger stones or stones blocking the urinary tract may need active treatment.

Medicines can reduce pain and may help selected ureteric stones pass, but they usually do not dissolve a 1 cm calcium stone. Some uric acid stones may dissolve with urine alkalinisation, but only after proper diagnosis and monitoring.

Observation may be reasonable only if the stone is:

• Not causing pain.
• Not causing fever.
• Not causing urine infection.
• Not blocking the kidney.
• Not increasing in size.
• Being followed with repeat imaging.

Treatment for 1 cm kidney stone depends on CT findings

For a 1 cm stone, CT KUB plain is often the most useful test before choosing treatment.

CT can show:

• Exact stone size.
• Stone location.
• Number of stones.
• Kidney swelling.
• Ureteric obstruction.
• Stone density or hardness.
• Skin-to-stone distance.
• Kidney anatomy.

EAU guidance notes that non-contrast CT can determine stone location, burden and density, and that stone density, structure, skin-to-stone distance and surrounding anatomy can affect treatment selection.

This is why two patients with “1 cm kidney stone” may need different treatment.

Option 1: Observation and follow-up

Observation means the stone is not removed immediately. Instead, it is monitored with ultrasound, X-ray KUB or CT KUB when needed.

Observation may be considered when:

• The stone was found accidentally.
• There is no pain.
• There is no infection.
• There is no kidney swelling.
• Kidney function is normal.
• The patient can return for follow-up.
• The patient understands the risk of future pain or growth.

Observation is usually not ideal if you have recurrent pain, fever or urine infection, swelling of the kidney, single functioning kidney, raised creatinine, frequent travel, poor access to emergency care or a job where sudden severe pain may be risky.

Option 2: ESWL shockwave treatment

ESWL means extracorporeal shockwave lithotripsy. Shockwaves are focused from outside the body to break the stone into smaller fragments. These fragments then pass through urine.

NIDDK describes shockwave lithotripsy as a treatment where shockwaves break the stone into smaller pieces that can pass through the urinary tract, usually as an outpatient procedure. BAUS also describes ESWL as a procedure where shockwaves are fired through the skin and focused on the stone to break it into fragments small enough to pass naturally.

When ESWL may be suitable

ESWL may be a good option if:

• The stone is around 1 cm.
• It is in the kidney pelvis, upper calyx or middle calyx.
• It is not very hard on CT scan.
• There is no active infection.
• There is no severe obstruction.
• The stone can be clearly targeted.
• The patient accepts the possibility of repeat sittings.

When ESWL may not be the best choice

ESWL may be less suitable if:

• The stone is in the lower pole.
• The stone is hard.
• The patient needs faster stone clearance.
• Stone fragments are unlikely to clear.
• There is active infection.
• There is significant blockage.
• Previous ESWL has failed.

The main advantage of ESWL is that it is non-invasive. The main limitation is that stone fragments may not clear fully, and more than one sitting may be needed.

Option 3: RIRS / flexible ureteroscopy with laser

RIRS means retrograde intrarenal surgery. A thin flexible telescope is passed through the urinary passage into the kidney. The stone is broken with laser. Small pieces may be dusted or removed with a basket.

NIDDK describes ureteroscopy as a procedure where a scope is passed through the urethra and urinary tract to see the ureter and kidneys; once the stone is found, it can be removed or broken into smaller pieces.

When RIRS may be preferred

RIRS may be better than ESWL when:

• The stone is in the lower pole.
• The stone is hard on CT scan.
• ESWL has failed.
• Faster clearance is preferred.
• There are multiple small stones.
• The stone is in the ureter or close to the kidney.
• The patient wants to avoid a puncture through the back.
• The patient wants a more predictable treatment than ESWL.

A temporary DJ stent may be placed after RIRS. This is a soft tube inside the ureter that helps urine drain while swelling settles. NIDDK notes that after stone procedures, a ureteral stent may sometimes be left to help urine flow or help a stone pass.

Common stent symptoms include:

• Burning while passing urine.
• Frequent urination.
• Urgency.
• Mild blood in urine.
• Flank discomfort while passing urine.

These symptoms usually improve after stent removal.

Option 4: Mini-PCNL

Mini-PCNL is a keyhole procedure done through a small puncture in the back directly into the kidney. It is more invasive than ESWL or RIRS, but it can give high stone clearance in selected patients.

When mini-PCNL may be considered

Mini-PCNL may be useful when:

• The stone is in the lower pole.
• The stone is hard.
• There are multiple stones.
• ESWL has failed.
• RIRS may not give good clearance.
• Kidney anatomy is unfavourable.
• One-session clearance is very important.

For a 1 cm stone, mini-PCNL is not needed for everyone. It is a selected option. The advantage is higher clearance in suitable cases. The trade-off is that it is more invasive and may involve more hospital stay and bleeding risk.

ESWL vs RIRS vs Mini-PCNL for 1 cm kidney stone

What if there is fever with a 1 cm kidney stone?

Fever with a blocked kidney is an emergency.

In this situation, the first step is usually drainage, not stone breaking. Drainage may be done by:

• DJ stent through the urinary passage.
• PCN/nephrostomy tube through the back into the kidney.

Stone removal is usually planned later after infection is controlled. This is done to reduce the risk of sepsis, which can become serious quickly.

Seek urgent care if stone pain is associated with fever, chills, vomiting, weakness, low urine output or confusion.

Recovery after 1 cm kidney stone treatment

Recovery depends on the procedure and your general health.

Do not assume the stone is gone just because pain has reduced. Follow-up imaging is important after ESWL, RIRS or mini-PCNL.

How to prevent another kidney stone

Stone removal is only one part of treatment. Prevention matters because kidney stones can recur.

Your urologist may advise:

• Stone analysis if fragments are available.
• Drinking enough fluids to keep urine pale.
• Reducing excess salt.
• Avoiding very high animal protein intake.
• Not stopping dietary calcium completely unless advised.
• Treating urine infection.
• Checking calcium, uric acid and metabolic risk in recurrent stone formers.
• 24-hour urine testing in selected patients.

NIDDK notes that after a stone has passed or been removed, the stone may be sent for analysis, and 24-hour urine testing can help measure urine volume and mineral levels. It also recommends fluid, diet and medicine changes depending on stone type and risk factors.

What to bring for consultation

Bring these if available:

• USG KUB report.
• CT KUB plain report and films/CD.
• Urine routine/microscopy.
• Urine culture if fever or burning urine.
• Serum creatinine.
• CBC if fever or infection symptoms.
• Previous stone surgery records.
• Discharge summaries.
• Current medicines.
• Blood thinner history.
• Diabetes, BP, heart or kidney disease records.
• Any passed stone fragments.

FAQs

Related reading

• ESWL for Kidney Stone: Benefits and Limitations
• Can a 10 mm Kidney Stone Pass Naturally?
• Can an 8 mm Kidney Stone Pass Naturally?
• Treatment for 1.5 cm Kidney Stone: RIRS, Mini-PCNL or ESWL?
• Diet After Kidney Stone Surgery: What to Eat, Drink and Avoid
• Kidney Stone Doctor in Latur
• RIRS Surgery in Latur

References

• European Association of Urology. EAU Guidelines on Urolithiasis https://uroweb.org/guidelines/urolithiasis/chapter/guidelines
• National Institute of Diabetes and Digestive and Kidney Diseases. Treatment for Kidney Stones https://www.niddk.nih.gov/health-information/urologic-diseases/kidney-stones/treatment
• British Association of Urological Surgeons. ESWL for kidney and ureteric stones https://www.baus.org.uk/patients/information_leaflets/131/eswl_for_kidney_and_ureteric_stones
• British Association of Urological Surgeons. Ureteroscopy for stone removal patient information https://www.baus.org.uk/_userfiles/pages/files/Patients/Leaflets/Ureteroscopy%20for%20stone.pdf