kidney stone begins as a tiny piece of crystal in the
kidney. When the urine leaves the kidney, it may carry the crystal out, or the
crystal may stay in the kidney. If the crystal stays in the kidney, over time
more small crystals join it and form a larger kidney stone.
stones leave the kidney and travel through the
urinary tract when they are still small enough to pass easily out of the body.
No treatment is needed for these stones.