Evidence for Randall's plaques to be the origin of primary renal stones

Lithofibrin, a non-protein organic component of renal calculi was found in renal papillas with the aid of stereo microscopy under UV illumination. Scanning electron microscopy revealed fibers of which one had a clump containing calcium on the top. The findings support the theory of Randall, that the origin of primary renal calculi is to be found in the kidney, not in the urine.