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Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the l

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Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the leg, which leads to blood accumulation in response to gravity and vein dilation. (b) Photograph of spider veins (small varicose veins) of the leg.  
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