Removal of all stone and fragments is an important goal of every operations of renal stone. In spite of using modern techniques for stone manage still residual calculi (retained calculi) is an ever existing problem. Of a total 1059 patients with renal stone seen between 1994-2004, 557 patient under went operation, of these 117 showed false recurrent calculi with a total incidence of 21% false recurrent rate. The reasons for incomplete removal of renal calculi are discussed, methods of decreasing the incidence are mentioned. Accurate intra-operative localization of stones is the most important factor.