Calcium Oxalate Crystalluria

Abstract
CaC2O4 crystals were obtained from urine specimens submitted to a hospital laboratory. The incidence of crystalluria was 4.2% of 42 times the maximum reported incidence of urinary calculi. The crystalluria was real and not artifactual. The crystalline structure was determined by polarized light, X-ray diffraction and electron microprobe analysis. CaC2O4 occurs in several forms.sbd.the dihydrate as bipyramidal and dodecahedral prisms, the monohydrate as biconcave ovals, dumbbell shapes and intermediate forms.