Comparison of Stone-Free Rates as Determined by Radiography and Endoscopy Following Percutaneous Nephrostolithotomy or Combination Therapy

  • John D. Denstedt
  • Ralph V. Clayman
  • Daniel P. Picus


The stone-free rate after extracorporeal shock wave lithotripsy (ESWL) is primarily determined by a plain abdominal radiograph (KUB) alone. However, the accuracy of that assessment can be challenged by renal tomography and flexible nephroscopy.

Herein is a report on 29 patients with large renal calculi treated with a combination of percutaneous nephrostolithotomy (PCNL) and ESWL. Stone-free rates were determined by KUB, renal tomography, and flexible nephroscopy. The KUB and renal tomography overestimated stone-free rates by 35% and 17% respectively, compared to flexible nephroscopy. For determining stone-free rates after ESWL, renal tomography is superior to KUB alone. Also, among patients with large renal calculi, the use of the flexible nephroscope markedly improves the stone-free rate.


Shock Wave Lithotripsy Extracorporeal Shock Wave Lithotripsy Residual Stone Nephrostomy Tube Stone Analysis 
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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • John D. Denstedt
    • 1
  • Ralph V. Clayman
    • 2
  • Daniel P. Picus
    • 1
  1. 1.Division of Urologic SurgerySt. LouisUSA
  2. 2.Mallinckrodt Institute of RadiologyWashington University School of MedicineSt. LouisUSA

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