Thrombosis of a groin artery. Coloured X-ray of a thrombosis of the right iliac artery (left) in the groin. A thrombosis is the disruption of the body's blood supply by the formation of an abnormal blood clot (thrombus) in a blood vessel. This frontal view of the groin arteries (red) shows the abdominal aorta (upper centre, the main body artery) dividing to form the two iliac arteries that supply the legs. Blood is flowing through the iliac artery at right, but a thrombus has blocked the other iliac artery (left). A contrast medium has been injected into the blood to highlight the blood vessels, a technique known as angiography.
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