Start with stone size, location and urinary drainage
Freiburg and Cologne document ultrasound and CT-based evaluation to locate stones and assess their size. For an international review, send the original imaging whenever possible because a small distal ureteral stone and a large branching renal stone do not belong to the same treatment pathway.
Not every stone needs the same intervention
The correct pathway is determined by the whole clinical situation rather than by the availability of a laser. Symptoms, obstruction, infection risk, kidney function, previous stone episodes and anatomy all matter. A patient with an acute complication should be stabilized locally before elective medical travel is considered.
ESWL treats selected stones without an endoscope
Charité and Freiburg document extracorporeal shock-wave lithotripsy (ESWL), in which externally generated shock waves fragment selected stones. Whether ESWL is a good option depends on stone location, size and other technical and clinical factors; it is not the universal least-invasive answer for every stone.
URS and flexible ureteroscopy can use laser fragmentation
Charité, Freiburg and Cologne document ureterorenoscopy (URS) for ureteral and renal stones. A thin endoscope is passed through the urinary tract and the stone can be removed or fragmented, including with laser fibers. Flexible renal endoscopy is often described separately as flexible URS or RIRS.
PCNL is a different pathway for larger or complex renal stones
Freiburg, Charité and Cologne document percutaneous nephrolithotomy or nephrolitholapaxy (PCNL/PNL), which reaches the kidney through a small tract from the skin. It is a more invasive episode than routine ureteroscopy but can be appropriate when the renal stone burden is large or complex.
Prevention matters after the acute stone episode
Freiburg provides recurrence-prevention follow-up, and Charité runs a dedicated nephrology stone clinic for recurrent or severe stone disease. Depending on the stone type and cause, prevention can include evaluation of metabolic risk, nutrition and fluid advice, selected medication and follow-up testing.
What to send for a German stone review
A useful remote assessment needs enough information to distinguish observation from the different interventional pathways.
- Recent CT or ultrasound images and reports
- Stone size, side and exact location
- Information about hydronephrosis or urinary obstruction
- Kidney-function laboratory results
- Urinalysis and urine culture when performed
- Previous URS, ESWL, PCNL or other stone procedures
- Stone analysis or metabolic evaluation if available
- Current medication including anticoagulants
- A clear question about observation, ESWL, URS/RIRS, PCNL or recurrence prevention
Official sources
Sources last checked 2026-09-12. Confirm current eligibility, procedure details and hospital requirements directly with the treating urology team.
- Kidney and urinary stones – diagnosis, ESWL, URS, PCNL and prevention — University Medical Center Freiburg ↗
- Kidney stones – ESWL, URS and percutaneous treatment — Charité – Universitätsmedizin Berlin ↗
- Kidney stone clinic – recurrence evaluation and prevention — Charité – Universitätsmedizin Berlin ↗
- Kidney and ureteral stones – imaging, URS and percutaneous removal — University Hospital Cologne ↗