ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Angiography video of the knee of a 72-year-old patient showing severe narrowing (stenosis) of the femoral and popliteal arteries (down centre). The patient was a former smoker, and had high blood pressure and high cholesterol levels. Angiography is an imaging technique in which a radio-opaque contrast medium is injected into blood vessels to allow them to be seen on an X-ray.
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