Bridging Collateral from an Internal Mammary Arterial Graft to a Coronary Artery

We report a rare case with bridging collateral communication from an occluded internal mammary arterial graft to the native left anterior descending coronary artery. Although the mechanism underlying the development of this unique collateral vessel is unknown, the phenomenon may imply a future possibility of effective angiogenesis from extra-cardiac systemic arteries to the coronary arteries in humans.