Medullary nephrocalcinosis in idiopathic hypercalciuria.

Idiopathic hypercalciuria is a metabolic abnormality characterized by excessive calcium excretion in the urine with normal serum calcium levels and is a common risk factor for formation of kidney stones and/or nephrocalcinosis. These patients benefit from a normal-calcium, reduced-animal protein, and low-salt diet, along with a thiazide diuretic.