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39. Picture of Kidney Stone Crystal

Picture of Kidney Stone Crystal
Flickr / Ken Gantz
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Kidney stones are made of salts and minerals in the urine that stick together, creating small "pebbles" formed within the kidney or urinary tract. They can be as small as grains of sand or as large as golf balls. Kidney stones are a common cause of blood in the urine and often severe pain in the abdomen, flank, or groin. One in every 20 people develops a kidney stone at some point in their life.

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  Kidney Stone Slideshow

Reviewed by Melissa Conrad Stoppler, MD on July 17, 2008

Image Source: Flickr / Ken Gantz

Text: MedicineNet - Kidney Stones

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