Conclusions: Stone area and ureteral stone location provide important information when deciding about the indication of a SWL in a patient with stone disease. However, successful resolution of only half of the cases after a single session at 3 weeks in our series undermines the relevance of informing patients about the potential need for additional treatment. (C) 2011 AEU. Published by Elsevier Espana, S.L. All rights reserved.