Biliary lithiasis can be defined as the presence of concrements in the gallbladder, the biliary ducts, or both. These concrements can be stones less than 3 mm or biliary sludge containing particles of smaller size. Biliary lithiasis and gallstone disease are two exchangeable umbrella terms for the same condition. Gallstone disease can be asymptomatic or associated with chronic or acute symptoms. Symptomatic disease is more common when gallstones are present than when biliary sludge alone is present