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Kidney stone

Kidney stones, also known as nephrolithiases, urolithiases or renal calculi, are solid accretions (crystals) of dissolved minerals in urine found inside the kidneys or ureters.

Note:   The above text is excerpted from the Wikipedia article "Kidney stone", which has been released under the GNU Free Documentation License.
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October 13, 2015

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updated 12:56 pm ET