Renal Calculi ( Kidney Stones )

A stone that develops from crystals that form in urine and build up on the inner surfaces of the kidney , in the renal pelvis , or in the ureters.
Kidney stones include calcium oxalate stones , cystine stones , struvite stones, and uric acid stones.

About Kidney Stones

Kidney stones are hard pebbles that form inside your kidneys.
Your kidneys are bean-shaped organs that filter the waste chemicals out of your blood and produce urine.
Urine travels through your urinary tract to leave your body.
The urine goes out of your kidneys , through your ureters ( the tubes that connect the kidneys to the bladder; pronounced YUR-et-ers ) , and into your bladder.
The bladder stores urine until it leaves your body when you urinate.

Kidney stones form when tiny mineral crystals in your urine stick together.
Kidney stones can range in size and shape.
They can be as small as a grain of sand or as large as a golf ball , although stones that big are rare.

If a kidney stone is small enough , it can move or "pass" through your urinary tract and out of your body on its own.
If the stone is too large , however , it could get stuck in your kidney or ureter.