Increasing coronary artery calcification (CAC) increases risk for future events. CAC progression occurs in 3 subgroups: 1) incident CAC; 2) calcified nonprogressors; and 3) CAC progressors. See the text for further details. The correlation of plaque type with CAC score in this figure is for descriptive purposes only, and the numbers are not part of any formal classification. Once calcification predominates in type 6 lesions they become known as type 7 “calcified” lesions.