Structural studies on milk of calcium in calyceal diverticulum.

Structural studies were performed on a renal specimen removed from a patient with milk of calcium in a calyceal diverticulum. Infrared spectroscopy revealed that stones consisted of crystals of calcium oxalate. On scanning electron microscopy and X-ray microanalysis, the intact surface of the stones was composed of weddellite and the fractured face of the stones showed calcium phosphate. Subsequently, stagnation is considered to be an important factor in the formation of milk of calcium.