[Observation on fungi within urinary stones]

We examined the fungi within the urinary stones of two cases by light microscopy and scanning electron microscopy. In one case, fungal elements, hyphae and spores, were found in some layers within a bladder stone. This patient probably had a history of fungal urinary infection. In another case brown hyphae suggesting dematiaceous fungi were found in the surface and peripheral layers of a kidney stone. This maybe due to contamination of the fungi after removal of the stones. These fungi invaded into interstices of the apatite crystals within the stone as in the tissue.