Low-density crystals or stones in any part of the URINARY TRACT. Their chemical compositions often include CALCIUM OXALATE, magnesium ammonium phosphate (struvite), CYSTINE, or URIC ACID.

Synonyms: Urinary Calculus, Urinary Calculi, Urinary Stones, Calculi, Urinary, Stone, Urinary Tract, Urinary Tract Stones, Stone, Urinary, Stones, Urinary, Urinary Stone, Urinary Tract Stone, Calculus, Urinary, Stones, Urinary Tract