ArticleInternational urology and nephrology2020
A presumptive role of lower ureteral angles in the difficulty of ureteral access sheath insertion during retrograde intrarenal surgery.
Article in International urology and nephrology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 9 citations in OpenAlex.
- The impact of preoperative CT-based 3D visualization model on ureteric access sheath placement failure without pre-stenting.BMC urology · 2026Article
- Preoperative CT imaging and machine learning models for predicting ureteral access sheath placement success in non-stented patients with ureteral calculi: a retrospective cohort study.World journal of urology · 2026Article
- Effect of long-term postoperative OM-89 administration on bacteriuria from suspected infectious stones.Investigative and clinical urology · 2025Article
- The effect of distal ureteral lateralization angle on ureteral trauma avoidance and successful ureteral access sheath placement.Ulusal travma ve acil cerrahi dergisi = Turkish journal of trauma & emergency surgery : TJTES · 2024Article
- Predictive factors for difficult ureter in primary kidney stone patients before retrograde intrarenal surgery.Central European journal of urology · 2024Article
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
Abstract
purposeWe aimed to investigate whether the angle created by the most lateral portion of the lower ureter is responsible for the difficulty in ureteral access sheath insertion.
methodsAll male patients scheduled to undergo flexible ureteroscopy were enrolled. Patients with ureteral stricture in any course of the ureter and patients with problems at the ureteral opening were excluded. We set the coordinates of the most lateral portion of the lower ureter as M (x, y, z) using computed tomography. The bladder outlet was marked as the zero point O (0, 0, 0). The vector that passed through the urethra and point O was expressed as V
resultsA total of 671 male patients were enrolled, among whom the ureteral access sheath could not pass through the most lateral portion of the lower ureter in 14 patients. The mean values of the α angle were 38.56° and 48.48° in the patient and control groups, respectively, compared with the 42 age- and sex-matched control subjects (p < 0.001).
conclusionThe ureteral angle determined by the level of the bladder outlet and the most lateral portion of the lower ureter could be a causative factor for the failure of ureteral access sheath insertion.
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