• Abnormally dilated tortuous veins produced by chronically increased intraluminal pressures and weakened vessel wall support
  • Veins have valves to prevent backflow -- the dilation renders them useless, allowing backflow and stasis, leading to edema, pain, and thrombosis
  • Most commonly occur on the lower extremities, in women
  • Risk factors:
    • Obesity
  • Other types of varicose veins, caused by portal

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