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Kidney stones
Kidney stones (urolithiasis) are mineral deposits in the urinary tracts.

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Kidney stones (renal calculi)

The urinary system, which consists of several organs including the kidneys and bladder, plays a key role in eliminating waste from the blood in the form of urine. Some of the waste comes from the foods that are eaten as they are broken down into various chemical components. Stones are small masses found in urine that develop when these chemical components stick together.
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