Can i know what is left cca and left bifurcation atherosclerotic plaque causing less than 50% stenosis. however no significant hemodynamic stenosis ?

Left CCA: Left common carotid artery (CCA) and left bifurcation - where the common carotid splits into external carotid(neck/face arteries) and internal carotid (brain arteries) are less than 50% stenosis- narrowed. We only are concerned if more than 70% because only then is there enough disturbance of flow - i.e. hemodynamically significant- to cause problems like strokes. At 505 follow up every year.