Can also be used to treat some varicose and nearly all spider veins. An extremely fine needle is used to inject the vein with a solution which shrinks the vein.

Ultrasound-guided Sclerotherapy

Involves an interventional radiologist passing a thin tube called a catheter into the vein using ultrasound guidance and injecting a substance that causes the veins to scar and close – rerouting the blood to healthier veins. The affected vein forms a knot of scar tissue that is absorbed by the body over time.