[Cardiac Tamponade due to Rupture of a Giant Coronary Aneurysm over Coronary Fistulas: Report of an Unusual Case]. / Taponamiento Cardíaco por Ruptura de Aneurisma Coronario Gigante sobre Fístulas Coronarias: Reporte de un Caso Inusual.

Coronary artery fistulas are rare clinical entities and their association with giant coronary aneurysms is even more unusual. Most fistulas are asymptomatic, but aneurysms could develop symptoms depending on their diameter. We present a patient with chest pain and cardiac arrest, who later developed cardiac tamponade that needed emergency surgery, due to rupture of a giant coronary aneurysm developed from confluent coronary artery fistulas from two coronary arteries to pulmonary artery.