Fig. 1From: 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 mid ureteric 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