Cardiac blood vessel fistula, rotating 3D coloured computed tomography (CT) angiogram. This fistula (abnormal connection) is between one of the coronary arteries and the pulmonary artery. The heart is a hollow muscular organ that receives and pumps blood from and around the body through the veins and arteries that branch out from its four internal chambers. The external surface of the heart includes the coronary arteries and veins that supply blood to the heart muscle. This scan includes parts of the lung blood vessels, and parts of the heart's major veins and arteries.
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