28 October 2025
: Case report 
Successful Treatment with a 6.3-Fr Disposable Digital Flexible Ureteroscope and Holmium Laser Lithotripsy in a 50-Year-Old Man with Large Bilateral Ureteral Stones and Hydronephrosis
Unusual clinical course, Unusual setting of medical care
Xiang Xu ABCDEF 1,2, Kaifeng Mao ABCDE 1, Feihong Xu ABCDE 1, Weiyong Zhong ABC 1, Wei Zhao BC 3, Mi Zhang ABCD 1, Zhenquan Lu ABC 1, Genggeng Wei ABCDE 1*DOI: 10.12659/AJCR.948301
Am J Case Rep 2025; 26:e948301
Figure 6 Ratio of endoscope-sheath diameter (RESD)(A) A 9.0-Fr flexible ureteroscope is shown paired with a 10-Fr vacuum-assisted ureteral access sheath (FAV-UAS), with RESD: 0.9. (B) A 6.3-Fr flexible ureteroscope is shown paired with a 10-Fr FAV-UAS, with RESD: 0.63. (C) A 7.5-Fr flexible ureteroscope is shown paired with a 10-Fr FAV-UAS, with RESD: 0.75.