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Figure 2 Bifurcation lesion classification from the Duke University Angiographic Core Lab, Duke University, Durham, North Carolina. Type A: Prebranch stenosis not involving the ostium of the side branch. Type B: Postbranch stenosis of the parent vessel not involving the origin of the side branch. Type C: Stenosis encompassing the side branch but not involving the ostium. Type D: Stenosis involving the parent vessel and ostium of the side branch. Type E: Stenosis involving the ostium of the side branch. Type F: Stenosis directly involving the parent vessel and ostium of the side branch.