2017 Volume 31 Issue 2 Pages 205-213
'New classification of Japanese gallbladder stones' shows 'pure cholesterol stone', 'combination stone', 'mixed stone', 'calcium bilirubinate stone', 'black stone' and 'rare gallstone' like 'calcium carbonate stone' or 'fatty acid calcium stone'.
In our resected 225 cases of gallbladder stones, we have analyzed chemical component of each stones and compared with the findings in 'New classification of Japanese gallbladder stones'. Some 'pure cholesterol stones' contained calcium bilirubinate or calcium carbonate. While some part of 'mixed stones' showed 100% cholesterol component. The result of chemical analysis for cholesterol stones did not always agree with the 'classification'. Macroscopic findings of 'black stone' were seen in all kinds of chemically analyzed component. So to discuss or study about 'black stone', macroscopic classification is inadequate, and chemical componential analysis is needed.
