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Idiopathic hypercalciuria is the presence of excess calcium in the urine without obvious cause. This condition can lead to kidney stones or osteoporosis.
Hypercalciuria - idiopathic
Rosen C. Osteoporosis. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 251.