Abstract
We classified 270 cases of gall stones treated surgicaly in our hospital into three groups as cases of cholecystolithiasis, cholecysto-choledocholithiasis, and choledocholithiasis. We then added 12 cases as a control group. Referring to the front view of the ERC findings as pre-operative examinations, we measured and analyzed the angle formed by the extra-hepatic left and right bile ducts (X angle), the angle formed by the extra-hepatic left bile duct and the common bile duct (Y angle), the angle of bend of the common bile duct (Z angle), the largest diameters of the extra-hepatic left and right bile ducts (Bl diameter and Br diameter) and the largest diameter of the common bile duct (CBD diameter) . In the groups with gall stones, the Z angle is sharper than in the control group. The largest bile duct diameter of the group with choledocal stones was much larger than that of the group with cholecystolithiasis and the controls. Moreover, study of the relation between the angle of bend and the largest diameter of the common bile duct indicated that the larger the common bile duct, the more it is apt to bend.
