Dear madam, i think that everything is said. It can be only calcification which means nothing. But it can also be a stone. You didnt mentioned the exact symptoms which led you to these diagnostic tests, but if it is a stone lodged in sphincter of Oddi you would have typical biliary colics or even jaundice
from time to time. So I recommend you if u have these symptoms u should do cholecystectomy
, if not u can do i too or you can wait for symptoms to appear. Dilatation of duct goes with biliary obstruction due to stones or tumors.
Wish you good health. Dr. Ivan Romich