This is an in-office treatment alternative to surgical removal of large veins. The vein is visually monitored on an ultrasound screen while a tiny needle is advanced into the vein. The sclerosant material is injected under ultrasound control. This enables sclerotherapy treatment of veins that can't be seen because they are deep below the surface of the skin and would otherwise require surgical removal. New advances in the sclerosing material including "Foam" made it possible to treat large veins.
Ultrasound guided Sclerotherapy is best for people with:

Large varicose veins Leg ulcers Skin conditions (such as pigmentation or eczema). Incompetent perforating veins.