Ultrasound evaluation of 20 consecutive patients undergoing percutaneous renal stone removal demonstrated fluid collections around the kidney to be common, occurring in 12 (60%). One was intraperitoneal, 7 were perirenal, and 4 were in the track through the posterior abdominal wall. In only 1 were related clinical complications evident. At long-term follow-up, local capsular thickening related to a surface dimple was seen at the puncture site in 66%, and fine cortical scars were visible in 33%. Apart from one slightly larger local cortical scar related to a segmental infarction, no other change related to the procedure was demonstrated.