Scanning electron microscopic study of calcium oxalate concretions grown in gel system and calcium oxalate stones.

Calcium oxalate concretions grown in gelatin gel medium, and calcium oxalate renal stones were studied by polarized light and scanning electron microscopy. In both cases, the results obtained confirm that the surface crystals have random axial orientation and that the gross configuration seems to be determined by the fibrous organic matrix. In vitro concretions grown in the gelatin gel medium are more resistant to EDTA demineralization and to ultrasonic irradiation than calcium oxalate stones.