PR. R. TOURNAY - CNRI / SCIENCE PHOTO LIBRARY PR. R. TOURNAY - CNRI / SCIENCE PHOTO LIBRARY
Varicose veins. Close-up of varicose veins on the lower leg. Varicose veins are veins that become swollen, lengthened and coiled. They form due to defective valves in the superficial veins, commonly in the legs, and may require surgical removal.
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