Filling of multiple vessels by injection of dye into a single bypass graft

We describe the unusual filling of two coronary bypass grafts by a single injection in a patient who underwent coronary arterial bypasses surgery. The injection, made in the left internal mammary artery, filled the left anterior descending artery, a diagonal branch, and the graft of saphenous vein placed to that artery. In contrast, injection in the saphenous vein graft to the diagonal artery filled the diagonal artery, the left anterior descending artery and the left internal mammary to its point of origin. We emphasize the importance of this phenomenon.