A total of 150 patients presenting with stone in the middle iliac uret
er were treated with extracorporeal shock wave lithotripsy using a Dor
nier HM-4 lithotriptor, For adequate radiological stone visualization
and excellent fragmentation, the prone position was used in all patien
ts. In 45 patients (30%) an ureteral stent was placed before treatment
. The overall success rate was 82% (123 of 150 patients). All patients
were treated on an outpatient basis without anesthesia.