Figure 1: (a-c) Preoperative and (d) follow-up coronary angiography. The Y-graft was used to bypass the left anterior descending coronary artery (right brunch and end-to-side anastomosis), the diagonal branch (right branch and side-to-side anastomosis), and the obtuse marginal branch (left branch and end-to-side anastomosis). The venous graft to the right posterior descending coronary artery could not be seen