Ultrasound guided foam sclerotherapy is a technique used to treat moderate sized varicose veins. Using ultrasound-guidance, veins are visualized beneath the skin while a very small needle injects medicine into the vein. The injection causes the vein wall to become sticky and collapse resulting in closure of the vein. The procedure typically takes less than 30 minutes and requires no anesthesia. Compression stockings need to be worn during the day for one week following the procedure.