Fever with an obstructing ureteric stone can be life-threatening
Seek Urgent Medical Care If
- You have fever, chills, confusion or rapidly worsening illness with flank pain or a known ureteric stone.
- You are passing very little or no urine, particularly with one functioning kidney or obstruction on both sides.
- Pain or vomiting remains severe and you cannot maintain fluids.
- You become faint, breathless, unusually drowsy or markedly weak.
An infected blocked kidney usually needs urgent drainage with a ureteric stent or nephrostomy. Definitive URSL is generally delayed until infection and systemic illness have settled.
What Is URSL?
Ureteroscopy means looking inside the ureter with a small telescope. Lithotripsy means breaking a stone into smaller pieces. During URSL, the surgeon passes a scope through the urethra, bladder and ureter to directly see and treat the stone.
A rigid or semi-rigid ureteroscope is commonly used for lower and middle ureteric stones. A flexible scope may be needed for an upper-ureteric stone, difficult anatomy or a stone that moves back into the kidney.
URSL and RIRS overlap—but they are not identical
URSL primarily describes treatment of a stone in the ureter. RIRS uses a flexible ureteroscope to work inside the kidney. The procedure can change from one approach to the other if stone position or access changes.
Where Is the Ureteric Stone?
Proximal or upper ureter
The segment nearest the kidney. A flexible scope, RIRS, shock-wave treatment or an antegrade approach may be considered according to size and impaction.
Middle ureter
The segment crossing the pelvis. Endoscopic access and stone migration risk vary with anatomy and stone characteristics.
Distal or lower ureter
The segment nearest the bladder. Smaller stones here are more likely to pass, while persistent or larger stones are commonly treated ureteroscopically.
Location alone does not determine treatment. The stone’s maximum dimension, degree of obstruction, duration, density, symptoms, infection status and kidney function all matter.
When May URSL Be Recommended?
- The stone is unlikely to pass because of its size, position or impaction.
- Planned observation has not resulted in progression or passage.
- Pain, vomiting or repeated emergency visits continue despite supervised care.
- The stone is causing persistent obstruction, worsening swelling of the kidney or concern about kidney function.
- There is one functioning kidney, bilateral obstruction or another reason that prolonged blockage carries greater risk.
- Shock-wave treatment is unsuitable, has failed or is unlikely to clear the stone efficiently.
- The patient prefers active removal after discussing the relative benefits and risks.
When Can Observation Be Reasonable?
A newly diagnosed small ureteric stone may pass naturally, especially when it is lower in the ureter. Observation requires an agreed follow-up plan and is only appropriate when pain is manageable, infection is absent, kidney function is protected and the patient can obtain urgent help if symptoms change.
Waiting is not the same as forgetting the stone. Follow-up must confirm passage or document its position; disappearance of pain does not prove that obstruction has resolved.
Confirming the Stone Before Surgery
Ureteric stones can move or pass between diagnosis and the scheduled operation. If the location is uncertain or symptoms have changed, updated imaging may be obtained shortly before URSL. The appropriate test depends on whether the stone was visible on earlier X-rays, the need to limit radiation and the clinical situation.
A “negative ureteroscopy” should be avoided when possible
If the stone has already passed, endoscopic surgery may no longer be necessary. Bring the actual earlier images and any passed fragment, not only the written report.
How Is the Treatment Choice Made?
What Happens Before URSL?
- Imaging review: The surgeon confirms stone position, size, obstruction and anatomy and decides whether updated imaging is needed.
- Urine assessment: Urine culture or microscopy is used to exclude infection before stone surgery.
- Blood tests: Kidney function, blood count and clotting assessment may be required.
- Anaesthetic assessment: Medical conditions, allergies and earlier anaesthetic problems are reviewed.
- Medication review: Bring a complete list. Never stop blood-thinning or other regular treatment without a written individualized plan.
- Fasting: Follow the hospital’s exact instructions rather than a generic online schedule.
- Consent: Discuss stone migration, failed access, residual fragments, stenting and the possibility of another procedure.
What Happens During URSL?
Laser Fragmentation and Stone Retrieval
Laser energy can divide the ureteric stone into pieces small enough to retrieve or pass. The aim is usually active clearance rather than leaving a large burden of dust within the ureter. A small basket or forceps may remove accessible fragments for analysis.
Fragmentation does not guarantee that every particle has disappeared. The operation note and follow-up plan should document any residual stone or concern about drainage.
What If the Stone Moves Back Into the Kidney?
Water flow, instrumentation or fragmentation can occasionally push an upper-ureteric stone or fragment into the kidney. This is called retropulsion or proximal migration.
If suitable equipment and access are available, the surgeon may use a flexible ureteroscope and continue as RIRS. Otherwise, a stent and later flexible procedure, shock-wave treatment or another planned approach may be safer. This possibility should be included in consent for an upper-ureteric stone.
Impacted Stones and Failed Access
An impacted stone has remained in one position long enough to become embedded in an inflamed ureteric wall. It can be harder to pass, fragment and retrieve, and it carries a greater risk of mucosal injury, perforation and later scar narrowing.
If the ureter is too narrow or resistance makes access unsafe, the surgeon may stop, place a temporary stent and return after the ureter has relaxed. Avoiding force protects the ureter; staged access is a safety decision rather than a failure.
Will I Need a Ureteric Stent?
Routine stenting is not necessary after every uncomplicated URSL with complete clearance. A stent becomes more likely when there is ureteric swelling or injury, an impacted stone, perforation, bleeding, residual fragments, infection risk, uncertain drainage, difficult access or a planned second procedure.
A stent can cause frequency, urgency, blood in urine, bladder discomfort or kidney-area pain during urination. Before discharge, obtain a written plan stating whether a stent was inserted, whether it has a removal string, and the exact removal or exchange arrangement.
Never leave without the stent plan
Do not pull a stent string unless the treating team has specifically instructed you. Contact the hospital if the stent appears displaced or the removal date is unclear.
What Should I Expect After URSL?
Patients are observed until awake, stable and able to pass urine appropriately. Many go home the same day or after a short stay, but infection risk, bleeding, difficult access, medical conditions or a complex procedure may require longer observation.
Temporary burning, urinary frequency, mild blood staining and flank or bladder discomfort can occur, especially with a stent. These should generally improve rather than progressively worsen.
After URSL
Contact the Hospital Urgently If
- You develop fever, chills, confusion or feel increasingly unwell.
- Pain becomes severe, is not controlled by the prescribed plan or is accompanied by persistent vomiting.
- You cannot pass urine or the amount falls markedly.
- Bleeding becomes heavy, large clots appear or you feel faint.
- A stent string or stent appears displaced, or it is accidentally removed.
- Symptoms worsen rather than improve, even without fever.
Possible Risks and Limitations
Residual or migrated stone
A fragment may remain or move into the kidney, requiring observation, RIRS, shock-wave treatment or another procedure.
Failed access
A narrow ureter may require temporary stenting and a later attempt.
Infection and urosepsis
Bacteria can enter the bloodstream despite precautions; urgent treatment may be required.
Ureteric injury
Abrasion, bleeding or perforation may require longer stenting or drainage. Major injury is uncommon.
Later ureteric stricture
Scar narrowing can occasionally obstruct drainage and require further assessment or treatment.
Bleeding or urinary retention
Persistent bleeding, clots or difficulty urinating can require observation, catheterization or another procedure.
Individual risks also depend on infection, pregnancy, bleeding tendency, kidney function, stone impaction, anatomy and previous urinary surgery. Your consent discussion should reflect your circumstances.
How Do URSL and Other Stone Treatments Differ?
What Does Successful Treatment Mean?
Successful URSL means more than seeing the stone fragment. The goals include relieving obstruction, minimizing residual burden, preserving the ureter and confirming safe kidney drainage.
Follow-up may use ultrasound, X-ray or CT according to stone visibility, residual concern and radiation considerations. Pain relief alone cannot confirm that the ureter is clear.
Recovery and Follow-Up
- Follow individualized instructions for fluid intake, activity, driving and return to work.
- Gentle movement is usually encouraged when safe; strenuous activity should wait for the advised timeframe.
- Keep the stent-removal or exchange appointment and confirm it before discharge.
- Attend planned imaging even if pain has stopped.
- Submit retrieved material for stone analysis when requested.
- Discuss recurrence prevention after recovery, particularly with recurrent, bilateral or high-risk stone disease.
Common Operation and Report Terms
Ureteric calculus
A stone within the tube connecting the kidney to the bladder.
Rigid or semi-rigid URS
A straight narrow telescope commonly used for lower or middle ureteric stones.
Flexible URS
A bendable telescope used for the upper ureter and kidney.
Impacted stone
A stone embedded at one site with surrounding ureteric inflammation.
Retropulsion
Movement of the stone or fragment upward toward or into the kidney.
Laser lithotripsy
Endoscopic fragmentation using laser energy delivered through a fine fibre.
Basket extraction
Retrieval of selected fragments with a small endoscopic device.
DJ or JJ stent
A temporary internal drainage tube with curled ends in the kidney and bladder.
Common Myths
Frequently Asked Questions
What does URSL stand for?
URSL commonly means ureteroscopic lithotripsy or ureterorenoscopic lithotripsy: endoscopic fragmentation of a urinary stone, usually within the ureter.
Does URSL require a skin incision?
No. The scope passes through the urethra and bladder into the ureter.
Can my stone pass before the operation?
Yes, particularly when it is small and near the bladder. Updated imaging may be needed when passage is possible or symptoms have changed.
Why is CT commonly used before URSL?
CT can define stone size, location, density, obstruction and surrounding anatomy. Imaging choice is individualized to the situation and radiation considerations.
Why do I need a urine test?
Operating through infected urine can cause severe systemic infection. Infection must be excluded or managed before definitive fragmentation.
What if the stone is not found?
It may have passed or migrated. The surgeon will decide whether to inspect further, use a flexible scope, place a stent or stop safely.
What if the stone moves into the kidney?
Flexible RIRS may be performed when appropriate, or a stent and later procedure or shock-wave treatment may be planned.
Why might the surgeon stop before treating the stone?
If the ureter is too narrow or access is unsafe, forcing the scope risks injury. Temporary stenting and a later attempt may be safer.
Will I definitely need a ureteric stent?
No. The need depends on ureteric swelling or injury, impaction, residual fragments, infection risk, drainage and whether another procedure is planned.
How is a stent removed?
It may be removed using a planned external string or a brief telescopic procedure. Obtain the date and method before discharge.
Can a stent cause pain and urinary urgency?
Yes. Frequency, urgency, blood staining, bladder discomfort and kidney-area pain during urination can occur. Severe or worsening symptoms need review.
How soon can I return to work?
This depends on anaesthesia, the operation, stent symptoms and job demands. Follow the individualized discharge advice rather than a fixed online timetable.
How will I know whether the ureter is clear?
Your urologist will decide whether follow-up imaging is needed. Symptoms alone cannot reliably confirm clearance and drainage.
Can the stone recur after URSL?
The treated stone does not regrow once removed, but residual fragments can enlarge and new stones can form.
When is higher-centre referral appropriate?
A large impacted upper-ureteric stone, complex anatomy, failed retrograde access, major injury, reduced kidney function or a need for antegrade or reconstructive treatment may require specialist higher-centre care.