Extracorporal Shockwave Lithotripsy Versus Retrograde Intrarenal Surgery for the Treatment of Kidney Stones

Inclusion criteria: - kidneystones requiring treatment up to an maximal size of 15mm (singular or multiple kidneystones with at least one stone with min. 5mm of size) * male and female patients between 18 and 99 years * informed consent signed by patient after explanation of the both treatment-modalities Exclusion criteria: - age \< 18 or \> 99 * pregnancy * breastfeeding mother * disorders of blood clotting * kidneystones \> 15mm * aneurysms of the aorta or renal artery * severe skeletal deformations which hamper one of the treatment modalities * synchronous stones of the ipsilateral ureter * stones which can not visualized which X-ray or sonography