=== Ureteric stenting difficulties ===
[[Image:Ureteral stent.jpg|thumb|right|400px]]
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|align = "center" bgcolor = "#00CCFF"|<font color="#993366">'''Common'''</font>
There are a variety of ureteral stent configurations with different anchoring systems. Most stents today have a double [http://linkinghub.elsevier.com/retrieve/pii/S014067360002674X pigtail anchoring system]. (Tolley, 2000), Dunn et al, (2000) conducted a randomized, single-blind study comparing a Tail stent (proximal pigtail with a shaft which tapers to a lumenless straight tail) to a double pigtail stent. The Tail stent was found to be better tolerated than the double-pigtail concerning
lower urinary tract irritative symptoms. A double-J ureteral stent and a flexible ureteropyeloscope are shown in the first diagram. The other two diagrams show a pigtail ureteral stent in place; the end of the pigtail is facing away fiom the ureteral opening in the second of these two diagrams.
[[Image:Ureteral stent.jpg|thumb|right|400px]]