Foam sclerotherapy

Foam sclerotherapy is a minimally invasive varicose vein treatment: a sterile sclerosing solution in foam form is injected with a fine needle directly inside the affected vein. The agent produces a controlled inflammatory reaction that closes the vein; it fades within a few weeks and is resorbed by the body, most often becoming invisible or nearly invisible. The procedure is done on an outpatient basis, without a scalpel, without anaesthesia and without hospitalisation.

Foam sclerotherapy at a glance

• Type of procedure: injection of sclerosing foam, no incisions and no scalpel
• Anaesthesia: usually not needed
• Duration: a few minutes per session, outpatient
• Hospitalisation: not needed
• Recovery: immediate mobilisation; walking about 30 minutes after the procedure
• Indications: telangiectasias, reticular veins, isolated, recurrent or below-knee varicose veins — veins of any size
• Result: the venous obliteration is usually permanent

What is foam sclerotherapy?

Sclerotherapy involves injecting a sterile sclerosing solution with a fine needle directly inside the vein. The agent irritates the vein walls in a controlled way and produces an inflammatory reaction whose effect is the closure of the vein. Blood flow through the treated vein stops, the vein scars over, fades within a few weeks and is then fully resorbed by the body.

The essential improvement of the foam variant over traditional sclerotherapy is the replacement of the liquid sclerosing agent with a foam one, of much higher efficiency: the foam does not mix with the blood, but pushes it out of the vein’s path and comes into direct contact with the vein walls — so the closure is more uniform, with a smaller amount of agent.

Who is foam sclerotherapy recommended for?

The optimal indications for this varicose vein treatment method include:

• telangiectasias — dilations of the small blood vessels, known as “spider veins”
• reticular veins — dilated veins with a net-like appearance, visible under the skin
• isolated varicose veins — individual veins, without extended venous insufficiency
• recurrent varicose veins — reappearing after other treatments or operations
• varicose veins located below the knee
• varicose veins of any size, depending on the ultrasound evaluation

When is it not recommended?

Foam sclerotherapy cannot be performed on patients with an allergy to the sclerosing agent. The procedure is also contraindicated for people suffering from occlusive arterial disease (blocked arterial circulation) or acute thrombophlebitis. All these situations are checked at the consultation before the procedure — which is why a complete vascular evaluation is mandatory before any injection.

How does the procedure work, step by step?

1. Doppler ultrasound — the veins to be treated are identified and highlighted; the doctor establishes the injection points.
2. Foam injection — with a very fine needle, the sclerosing foam is introduced into the problem areas. The mixture of agent and air pushes the blood out of the vein’s path and produces a controlled spasm of the vein.
3. Vein closure — the blood flow stops in the treated vein; the vein walls stick together and the scarring process begins.
4. Compression — a compression bandage is applied and kept for a few days, to help the vein walls seal.
5. Mobilisation — you can move around immediately; walking is indicated about 30 minutes after the procedure. Besides the circulatory benefit, this walk also has the role of speeding up the appearance of any allergic reaction to the sclerosing agent, so it can be treated immediately, while you are still at the clinic.

The treated vein fades within a few weeks and is resorbed by the body. If the result is not fully satisfactory, the treatment can be repeated for the same vein.

What do you feel during the procedure?

The pain felt is of low or very low intensity, depending on the solution used and its concentration — comparable to an ordinary needle prick. No anaesthesia is needed, and the discomfort after the procedure is minimal.

What are the advantages of foam sclerotherapy?

• allows the radical treatment of varicose disease in the right indications
• involves no scalpel, incisions or anaesthesia
• much more effective than traditional sclerotherapy with liquid agent
• the sclerosing agent comes into direct contact with the vein walls, without mixing with the blood
• outpatient procedure, with benefits visible immediately
• the venous obliteration — stopping the flow and closing the vein — is usually permanent

What is the recovery like?

Foam sclerotherapy requires no hospitalisation — you go home right after the procedure and resume your usual activities. The compression bandage applied after the injection must be kept for a few days, as instructed by the doctor, to support the closure of the vein. Any discomfort or redness in the injection area disappears in about 72 hours.

In the following weeks, the treated vein fades progressively. At the follow-up, the doctor checks the result and decides whether an additional session is needed for the same vein or for other areas.

Risks and limitations

Transient local reactions — redness, sensitivity, small bruises at the injection site — are common and disappear within days. In some patients, a temporary brownish pigmentation may appear along the treated vein, fading over time. Allergic reactions to the sclerosing agent are rare, and this is precisely why the procedure includes immediate post-injection observation. For varicose veins caused by extended venous insufficiency, sclerotherapy alone does not treat the cause — which is why the prior ultrasound evaluation is essential.

Sclerotherapy compared with the other methods

• vs the Alpha method — Alpha uses the same foam, but injected through a special catheter under continuous ultrasound guidance, for deep or hard-to-reach veins — see the Alpha method
• vs STEAM — steam ablation is preferred for venous trunks and large veins; sclerotherapy for small and medium veins — see the steam method
• vs laser — simple laser is an alternative for telangiectasias; the choice depends on the vein calibre and the patient’s preference — see laser therapy

Frequently asked questions

Does foam sclerotherapy hurt?

The pain is of low or very low intensity — a fine needle prick, depending on the solution used and its concentration. No anaesthesia is needed.

How many sessions are needed?

Many veins close after a single session. If the result is not fully satisfactory, the treatment can be repeated for the same vein. The total number of sessions depends on how many veins are treated and on their size.

How long until the vein disappears?

The vein scars over and fades within a few weeks of the injection, then is gradually resorbed by the body, becoming invisible or nearly invisible.

Is the result permanent?

The closure of the treated vein is usually permanent. Varicose disease can however produce new veins in other areas over time — periodic check-ups allow treating them early, with minimal effort.

Can I drive and go to work after the procedure?

Yes. Mobilisation is immediate, walking is even recommended, and usual activities — including work — are resumed the same day.