タイトルまたは説明

Gallstones can vary in size and shape from as small as a grain of sand to as large as a golf ball.[4] The gallbladder may contain a single large stone or many smaller ones. Pseudoliths, sometimes referred to as sludge, are thick secretions that may be present within the gallbladder, either alone or in conjunction with fully formed gallstones. The clinical presentation is similar to that of cholelithiasis.[citation needed] The composition of gallstones is affected by age, diet and ethnicity.[5] On the basis of their composition, gallstones can be divided into the following types: