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Updated: Feb 19, 2026

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Published on: June 21, 2024
[Evaluation of stone size before flexible ureteroscopy: Which measurement is best?]
R Diamand1, M Idrissi-Kaitouni1, E Coppens2
1Service d'urologie, cliniques universitaires de Bruxelles, hôpital Erasme-ULB, 808, route de Lennik, 1070 Bruxelles, Belgique.
Purpose:
To retrospectively assess the clinical utility in ureteroscopy (URS) planning of radiological parameters as predictor of stone-free status after a single flexible ureteroscopy.
Material:
Sixty-seven patients with renal stones treated by flexible URS were retrospectively evaluated. To assess the clinical utility of radiological parameters, relationships between stone-free (SF) status and stone burden (maximal diameter, calculated area, calculated volume, cumulative diameter, and tridimentionnal volume [V3D]) were analyzed using the area under the receiver operating characteristics curve and logistic regression.
Results:
Maximal diameter (AUC=0.75), calculated area (AUC 0.79), calculated volume (AUC=0.79), cumulative diameter (AUC=0.80) and tridimensional volume (AUC=0.82) revealed ability to predict SF status after URS.
Conclusion:
Stone burden evaluation is critical in predicting SF status after a single URS. Planar and volumetric measurements showed equal ability to predict SF status. V3D is more accurate but diameter measurement remains easier in clinical practice.
Level Of Evidence:
4.
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