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In page Varicose veins:

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Complications of sclerotherapy are rare but can include blood clots and ulceration. Anaphylactic reactions are "extraordinarily rare but can be life-threatening," and doctors should have resuscitation equipment ready.[7][8] There has been one reported case of stroke after ultrasound-guided sclerotherapy when an unusually large dose of sclerosant foam was injected.[citation needed]