THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -A calculus (plural calculi), often called a stone, is a concretion of material, usually mineral salts, that forms in an organ or duct of the body. Formation of calculi is known as lithiasis (/ˌlɪˈaɪəsɪs/).

Detailed explanation-2: -What are bladder stones? Bladder stones form when minerals in urine (pee) crystalize and clump together in the bladder. The medical term for bladder stones is bladder calculi. Bladder stones generally develop when some urine stays in the bladder after you pee.

Detailed explanation-3: -calculi [L. calculus, pebble] A stone, usually composed of mineral salts. Stones can occur in the gallbladder, kidneys, ureters, bladder, or urethra.