Coronary artery fistula is an abnormal connection between the coronary artery and the heart or other blood vessels. Coronary arteries carry oxygen-rich blood to the heart tissue. A small fistula will not affect this blood flow, but larger fistulas may cause problems.

The Coronary Arteries
si1902_the coronary arteries
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This condition is typically a congenital defect. This means that the baby is born with it. It is not known exactly why the fistula develops.

Some fistulas can also occur after birth due to infection, injury, or heart surgery.