Fig. 2From: The “Guidewire-Coil”-Technique to prevent retrograde stone migration of ureteric calculi during intracorporeal lithothripsyStep-by-step description of the “Guidewire-Coil-Technique” based on the example of a proximal stone. a: Plain x-ray; b: Retrograde pyelography; c: Correctly placed coil of the guidewire. Asterisk = Ureteral calculus, arrow = Reverted guidewire acting as a counterfort Back to article page