Purpose: We describe a useful technique for untying a knotted ureteral
catheter. Materials and Methods: An Amplatz super stiff guide wire wa
s advanced through the lumen of the stent and with uniform force the k
not was untied. Results: The knot was untied and the stent was removed
. A nephrostomy tube or other more invasive techniques for removal wer
e avoided. Conclusions: An Amplatz super stiff guide wire passed retro
grade via the ureteral stent lumen should be considered as a valid alt
ernative to percutaneous removal of a knotted ureteral stent.