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 a 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.