What condition is indicated by renal calculi?

Renal calculi refer specifically to solid masses of crystals that form in the kidneys, commonly known as kidney stones. These stones develop when certain substances in the urine, such as calcium, oxalate, and uric acid, are present in concentrations that exceed their solubility, leading them to crystallize. Symptoms of kidney stones often include severe pain, blood in urine, and sometimes nausea or vomiting. The terminology "renal calculi" directly signifies abnormalities concerning the kidneys, thus confirming that the correct identification of this condition is indeed kidney stones.