My gallbladder was removed 2001 and the problem has been for years my common bile duct is 16mm and very painful.
Fudgen, in many people the bile duct is found to be enlarged after gallbladder removal, although no one knows why. However, there are also cases in which there can be changes that are not that simple, so it's a good idea that you're getting it checked out. And keep in mind that a CT scan isn't the greatest if they're going to look for things like sludge and stones which can develop months to years after having a GB removed.