DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Varicose veins. Close-up of varicose veins on the rear of the leg of a 46-year-old male patient. 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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