What is the most probable cause in this patients case

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What is the most probable cause in this patients case

Q. Mrs. Gray, a 50-year-old mother of seven children, is complaining of dull, aching pains in her legs. She reports that they have been getting progressively worse because the birth of her last child. All through her physical examination, numerous varicosities are seen in both legs. How are varicosities recognized? What veins are most likely involved? What pathologic changes have happened in these veins, and what is the most probable cause in this patient’s case?