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Figure 1 Coronary angiograms demonstrating true bifurcation lesions. Duke class D lesion (A) with an 85% stenosis in the proximal LAD and an 89% stenosis in the distal LAD and with a 77% stenosis in the ostium of the contiguous diagonal branch. Duke class F lesion (B) with an 84% stenosis in the proximal LAD and a diffuse 65% stenosis in the ostium and proximal portion of the diagonal branch.
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