RESUMO
PURPOSE: We analyzed our experience to determine the influence of infundibulo-pelvoureteral angle, lower calyceal width and length in predicting the clearance of fragments after extracorporal shock wave lithotripsy(ESWL) for lower calyceal stone. MATERIALS AND METHODS: From October 1995 to April 1998, a retrospective analysis of 51 patients with a solitary radiopaque lower pole calyceal stone who underwent excretory urography(IVP) preoperatively were treated ESWL with a Storz Modulith SLX third generation. RESULTS: The overall stone-free rate was 54.9%. Stone-free status after ESWL was significantly related to each anatomical measurement. Of the stone-free and not stone-free groups, with the infundibulo-pelvoureteral angle 40 degree or greater 21 patients were found in stone-free groups(75%) and 5 patients in not stone-free groups(21.7%), with the infundibular width >5mm 22 patients were found in stone-free groups(78.6%) and 11 patients in not stone-free groups(47.8%) and with the infundibular length < or =30mm 16 patients were found in stone-free groups(57.1%) and 5 patients in not stone-free groups(21.7%), respectively. CONCLUSIONS: We recommend that the 3 major radiographic features of the lower pole calix should be assessed during intravenous urography to facilitate the planning of treatment for lower calyceal stones.