Purpose: We reviewed the natural history of residual fragments after percutaneous
nephrostolithotomy. Materials and Methods: From April 1999 to January 2007 a total of 728
patients underwent percutaneous nephrostolithotomy at our medical center including 527
with a minimum documented radiographic followup of 6 months. Of these patients 42 (8%)
with residual fragments on postoperative computerized tomography were observed rather
than subjected to second look flexible nephroscopy. Computerized tomography was …

Materials and Methods: From April 1999 to January 2007 a total of 728 patients underwent
percutaneous nephrostolithotomy at our medical center including 527 with a minimum
documented radiographic followup of 6 months. Of these patients 42 (8%) with residual
fragments on postoperative computerized tomography were observed rather than subjected
to second look flexible nephroscopy. Computerized tomography was reviewed to define
location, size and number of residual fragments. The primary study end point was a stone …