Coronary artery fistula is an abnormal vascular communication of coronary artery with cardiac chambers or any segment of the systemic or pulmonary circulation. The prevalence is 0.9% of all coronary anomalies. Coronary artery fistula arises from the right coronary artery in approximately 50.0% of patients, from left coronary artery in approximately 42.0% of patients, and from both in approximately 5.0% of patients. Low-pressure structures are the most common sites of drainage of the coronary fistulas. If a large left-to-right shunt exists, it can be associated with potential complications, such as arterial aneurysm. Here we report an extremely rare case of a 76-year-old woman with bilateral coronary-to-pulmonary artery fistulas associated with giant aneurysms, detected by coronary angiography and confirmed with coronary computed tomography.

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