[Incrusted cystitis with isolation of Corynebacterium group D2].

Three cases of encrusted cystitis caused by Corynebacterium group D2 are described. The vesical damage previous to the establishment of this bacteria is noteworthy and the very rapid increase in urease activity explains the pathogenesis of the situation. Thus allowing for its identification and is relevant to treatment. Cloudy urine with a strong smell of ammonium, alkaline pH and crystals of ammonium magnesium phosphate in the sediment will bring this microorganism and its characteristic growth pattern to mind thus avoiding a falsely negative report. Treatment combining an antimicrobial agent and cystoscopic resection of the encrusted stones, where Corynebacterium group D2 has lodged, has proved efficacious. Vancomycin and teicoplanin have always been active and are eliminated through the kidneys.