An angiogram is an X-ray investigation of the blood vessels, where a contrast agent is injected into the blood vessel and an X-ray taken.
The contrast agent is a special substance which shows up on X-ray.
Angiograms are done to show up the blood vessels, either to investigate their integrity (eg blockage, external obstruction), to look for aneurysms (abnormal connections between vessels) or to investigate tumours related to the blood vessels.
After total dislocation of the knee (not the kneecap) an angiogram is an important procedure.
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