Journals / Endoüroloji Bülteni / 2026 / Cilt: 18 Sayı: 1

Can the De Nunzio Nomogram Reliably Predict Stone-Free Rates After Semirigid Ureteroscopy? A Retrospective External Validation Study

De Nunzio Nomogramı, Semirigid Üreteroskopi Sonrası Taşsızlık Oranlarını Güvenilir Şekilde Öngörebilir mi? Retrospektif Bir Eksternal Validasyon Çalışması

Mehmet Şahin(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0000-0001-6712-7207
Ertuğrul Arıkız(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0009-0002-9639-7577
Yusra Nur Aksakal(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0009-0000-7598-8656
Yiğit Can Filtekin(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0000-0002-8788-5598
Turan Özdemir(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0000-0002-1131-2507
Metin Savun(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0000-0003-4434-9661
Halil Lütfi Canat(SAĞLIK BİLİMLERİ ÜNİVERSİTESİ, İSTANBUL BAŞAKŞEHİR ÇAM VE SAKURA ŞEHİR SAĞLIK UYGULAMA VE ARAŞTIRMA MERKEZİ, CERRAHİ TIP BİLİMLERİ BÖLÜMÜ, ÜROLOJİ ANABİLİM DALI)0000-0001-6481-7907
Pages
20–29
Publication Date
2026-01-29
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

Results: The overall stone-free rate was 85.7%.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: To externally validate the De Nunzio nomogram for predicting stone-free outcomes after semirigid ureteroscopic lithotripsy (ULT) in patients with ureteral stones.
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Key Findings & Data:Materials and Methods: This retrospective study included 385 patients who underwent semirigid ULT for ureteral stones between December 2021 and October 2024.
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Conclusion & Impact:Results: The overall stone-free rate was 85.7%.
🔬Design:Araştırma Makalesi
📍Scope:2021 Verileri
⚙️Variables:de Nunzio skoru · nomogram doğrulama · semirigid üreteroskopi

Abstract

Objective: To externally validate the De Nunzio nomogram for predicting stone-free outcomes after semirigid ureteroscopic lithotripsy (ULT) in patients with ureteral stones. Materials and Methods: This retrospective study included 385 patients who underwent semirigid ULT for ureteral stones between December 2021 and October 2024. Demographic, clinical, and radiological data were collected. The De Nunzio nomogram score was calculated for each patient. Stone-free status was defined as the complete absence of residual fragments on imaging within 4–6 weeks postoperatively. Predictive performance of the nomogram was assessed using ROC curve analysis and decision curve analysis (DCA). Results: The overall stone-free rate was 85.7%. There were no significant differences between the stone-free and non-stone-free groups regarding age, gender, or stone density. However, patients in the stone-free group more frequently had single stones, lower median stone length, and lower De Nunzio scores. Stones were more commonly located in the middle and distal ureter, while pyuria and hydronephrosis were less frequently observed in this group. The nomogram demonstrated high discriminative performance with an AUC of 0.866. DCA showed a net clinical benefit across a wide range of threshold probabilities. Conclusions: The De Nunzio nomogram is a valid and clinically useful tool for predicting stone-free outcomes following semirigid ULT. Its implementation may enhance preoperative risk stratification and support individualized treatment planning in patients with ureteral stones.

Özet

Amaç: De Nunzio nomogramının, üreter taşı bulunan hastalarda semirigid üreteroskopik litotripsi (ULT) sonrası taşsızlık sonuçlarını öngörme gücünün eksternal validasyonunu yapmak. Gereç ve Yöntem: Bu retrospektif çalışmaya, Aralık 2021 ile Ekim 2024 tarihleri arasında üreter taşı nedeniyle semirigid ULT uygulanan 385 hasta dahil edildi. Demografik, klinik ve radyolojik veriler toplandı. Her hasta için De Nunzio nomogram skoru hesaplandı. Taşsızlık durumu, ameliyat sonrası 4–6 hafta içinde görüntülemede rezidü taş olmaması olarak tanımlandı. Nomogramın prediktif performansı ROC eğrisi analizi ve karar eğrisi analizi (DCA) ile değerlendirildi. Bulgular: Genel taşsızlık oranı %85,7 idi. Taşsız ve rezidü kalan gruplar arasında yaş, cinsiyet veya taş dansitesi açısından anlamlı fark yoktu. Taşsız gruptaki hastalarda tek taş olma sıklığı daha fazlaydı. Ayrıca median taş uzunluğu ve De Nunzio skorları daha düşüktü. Taşlar daha çok mid ve distal üreterde lokalizeydi; piyüri ve hidronefroz bu grupta daha az sıklıkla izlendi. Nomogram, 0,866’lık AUC değeri ile yüksek ayırt edici performans gösterdi. DCA, geniş bir eşik olasılık aralığında nomogramın net klinik fayda sunduğunu ortaya koydu. Sonuç: De Nunzio nomogramı, semirigid ULT sonrası taşsızlık sonuçlarını öngörmede geçerli ve klinik olarak faydalı bir araçtır. Bu nomogramın kullanımı, preoperatif risk sınıflandırmasını geliştirebilir ve üreter taşı olan hastalarda bireyselleştirilmiş tedavi planlamasını destekleyebilir.

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Cite This Article

Şahin, M., Arıkız, E., Aksakal, Y. N., Filtekin, Y. C., Özdemir, T., Savun, M., Canat, H. L. (2026). Can the De Nunzio Nomogram Reliably Predict Stone-Free Rates After Semirigid Ureteroscopy? A Retrospective External Validation Study. Endoüroloji Bülteni, Cilt: 18 Sayı: 1, 20–29. https://doi.org/10.54233/endourolbull-1749767

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References (26)

  1. Awedew AF, Han H, Berice BN, Dodge M, Schneider RD, et al. The global, regional, and national burden of urolithiasis in 204 countries and territories, 2000–2021: a systematic analysis for the Global Burden of Disease Study 2021. EClinicalMedicine. 2024;78:102924. https://doi.org/10.1016/j.eclinm.2024.102924
  2. Glazer K, Brea IJ, Leslie SW, Vaitla P. Ureterolithiasis. StatPearls [Internet]. 2024. Available from: https://www.ncbi.nlm.nih.gov/books/NBK470209/
  3. Pietropaolo A, Massella V, Ripa F, Sinha MM, Somani BK. Ureteroscopy and lasertripsy with pop dusting using high-power holmium laser for large urinary stones >15 mm: 6.5-year prospective outcomes from a high-volume stone center. World J Urol. 2023;41:1935–41. https://doi.org/10.1007/s00345-023-04438-4
  4. De Coninck V, Keller EX, Somani B, Giusti G, Proietti S, et al. Complications of ureteroscopy: a complete overview. World J Urol. 2020;38:2147–66. https://doi.org/10.1007/s00345-019-03012-1
  5. Imamura Y, Kawamura K, Sazuka T, Sakamoto S, Imamoto T, et al. Development of a nomogram for predicting the stone-free rate after transurethral ureterolithotripsy using a semi-rigid ureteroscope. Int J Urol. 2013;20:616–21. https://doi.org/10.1111/j.1442-2042.2012.03229.x
  6. De Nunzio C, Bellangino M, Voglino OA, Baldassarri V, Lombardo R, et al. External validation of Imamura’s nomogram as a tool to predict preoperatively laser semi-rigid ureterolithotripsy outcomes. Minerva Urol Nefrol. 2019;71:531–6. https://doi.org/10.23736/S0393-2249.18.03243-5
  7. De Nunzio C, Ghahhari J, Lombardo R, Russo GI, Albano A, et al. Development of a nomogram predicting the probability of stone-free rate in patients with ureteral stones eligible for semi-rigid primary laser uretero-lithotripsy. World J Urol. 2021;39:4267–74. https://doi.org/10.1007/s00345-021-03768-5
  8. Zhang Y, Xie Z, Wu L, Hua S, Wang X, et al. A nomogram for predicting the risk of residual stone fragments after ureteroscopy. Transl Androl Urol. 2023;12:364–74. https://doi.org/10.21037/tau-22-609
  9. Sihombing AT, Wijayanti Z, Steven S, Stefanus D. Uncovering new horizons: update to Quadruple-D Score to predict stone-free rate with advanced non-invasive lithotripsy technology. Urol Res Pract. 2025;51:38. https://doi.org/10.5152/tud.2025.24152
  10. Li Z, Tang X, Wu S, Liu S, Wang X, et al. Efficacy and safety of semirigid ureteroscopy combined with holmium:yttrium-aluminum-garnet laser lithotripsy for the treatment of proximal ureteral calculi: a single-arm meta-analysis. Eur Urol Open Sci. 2024;70:124–34. https://doi.org/10.1016/j.euros.2024.10.006
  11. Ahmed F, Al-Kohlany K, Al-Naggar K, Alnadhari I, Altam AY, et al. Assessing the predictive accuracy of the S.T.O.N.E. score for stone-free rates in semirigid pneumatic ureteral lithotripsy: implications for validation. Res Rep Urol. 2025;17:139. https://doi.org/10.2147/RRU.S515846
  12. Moufid K, Abbaka N, Touiti D, Adermouch L, Amine M, et al. Large impacted upper ureteral calculi: a comparative study between retrograde ureterolithotripsy and percutaneous antegrade ureterolithotripsy in the modified lateral position. Urol Ann. 2013;5:140–6. https://doi.org/10.4103/0974-7796.115729
  13. Molina WR, Kim FJ, Spendlove J, Pompeo AS, Sillau S, et al. The S.T.O.N.E. score: a new assessment tool to predict stone-free rates in ureteroscopy from pre-operative radiological features. Int Braz J Urol. 2014;40:23–9. https://doi.org/10.1590/S1677-5538.IBJU.2014.01.04
  14. Simsekoglu MF, Derekoylu E, Ozkaya M, Demirbilek M, Aferin U, et al. A new nomogram to predict the success of shock wave lithotripsy in ureteral stones. Int J Clin Pract. 2024:6872476. https://doi.org/10.1155/2024/6872476
  15. Huang H, Song H, Ding T, Xu YY, Fan Y, et al. B.T.C.H. nephrolithometry score: a novel scoring system to predict stone-free rate and complexity for ultrasound-guided percutaneous nephrolithotomy. Front Med (Lausanne). 2025;12:1557702. https://doi.org/10.3389/fmed.2025.1557702
  16. Lazarovich A, Haramaty R, Shvero A, Zilberman DE, Dotan ZA, et al. Primary ureteroscopy without pre-stenting for proximal ureteral stones—is it feasible? Life (Basel). 2023;13:2019. https://doi.org/10.3390/life13102019
  17. Serrão Gimenez LG, Souto Santana D, Maia Lopes GM, Baldissera Cardoso R, Cordeiro Porto B, et al. Comparison of efficacy and safety of fluoroscopy-free and conventional retrograde ureteroscopy for urolithiasis: a systematic review and meta-analysis of randomized controlled trials. Minerva Urol Nefrol. 2025;77:162–70. https://doi.org/10.23736/s2724-6051.25.06087-2
  18. De La Rosette J, Denstedt J, Geavlete P, Keeley F, Matsuda T, et al. The clinical research office of the endourological society ureteroscopy global study: indications, complications, and outcomes in 11,885 patients. J Endourol. 2014;28:131–9. https://doi.org/10.1089/end.2013.0436
  19. Perez Castro E, Osther PJS, Jinga V, Razvi H, Stravodimos KG, et al. Differences in ureteroscopic stone treatment and outcomes for distal, mid-, proximal, or multiple ureteral locations: the Clinical Research Office of the Endourological Society Ureteroscopy Global Study. Eur Urol. 2014;66:102–9. https://doi.org/10.1016/j.eururo.2014.01.011
  20. Kim HJ, Daignault-Newton S, DiBianco JM, Conrado B, Mohammad Jafri S, et al. Real-world practice stone-free rates after ureteroscopy: variation and outcomes in a surgical collaborative. Eur Urol Focus. 2023;9:773–80. https://doi.org/10.1016/j.euf.2023.03.010
  21. Akgül M, Çakır H, Çinar Ö, Özman O, Başataç C, et al. The efficacy and safety of retrograde intrarenal surgery: a multi-center experience of the RIRSearch group study. J Urol Surg. 2023;10:119–28. https://doi.org/10.4274/jus.galenos.2023.2022.0039
  22. Binuya MAE, Engelhardt EG, Schats W, Schmidt MK, Steyerberg EW. Methodological guidance for the evaluation and updating of clinical prediction models: a systematic review. BMC Med Res Methodol. 2022;22:1–14. https://doi.org/10.1186/s12874-022-01801-8
  23. Eminaga O, Shkolyar E, Breil B, Semjonow A, Boegemann M, et al. Artificial intelligence-based prognostic model for urologic cancers: a SEER-based study. Cancers (Basel). 2022;14:3135. https://doi.org/10.3390/cancers14133135
  24. Rosiello G, Larcher A, Fallara G, Giancristofaro C, Martini A, et al. Head-to-head comparison of all the prognostic models recommended by the European Association of Urology Guidelines to predict oncologic outcomes in patients with renal cell carcinoma. Urol Oncol. 2022;40:271.e19–27. https://doi.org/10.1016/j.urolonc.2021.12.010
  25. Gnanapragasam VJ. Optimizing clinical risk stratification of localized prostate cancer. Curr Opin Urol. 2025;35(4):426-31. https://doi.org/10.1097/mou.0000000000001294
  26. Anan G, Kudo D, Matsuoka T. What are the predictors of residual stone after ureteroscopy for urolithiasis? Transl Androl Urol. 2022;11:1071–3. https://doi.org/10.21037/tau-22-438