Kidney stone crystals. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a kidney stone to show the crystalline structure. Kidney stones are usually formed by the precipitation of the mineral salt calcium oxalate from urine. The resulting hard, round stones (calculi) may cause severe pain, especially as they pass down the urinary tract. Large stones may need to be surgically removed or broken down using ultrasound therapy.
October 7th, 2018
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