Final answer:
Kidney stones, or renal calculi, are mineral crystals that form in the kidney and can cause pain and blockages in the urinary tract.
Explanation:
Kidney stones, also known as renal calculi, are solid crystals formed in the kidney from minerals in urine. They can cause severe pain and blockages in the urinary tract, potentially leading to kidney damage. Commonly made of calcium salts, kidney stones can vary in size and may pass unnoticed or cause significant symptoms.
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