The Bacteriology of Operated Renal Stones

Abstract

It has been claimed that magnesium-ammonium-phosphate (map) stones can form only as a result of an infection with urease-producing microorganisms. It has been, however, our clinical experience that map stones also occur in patients where urease-producing microorganisms cannot be cultured. The aim of this study was to investigate how often this occurred and how often map stones were associated with an infection with non-urease-producing microorganisms. The value of performing stone cultures was also evaluated.