Sclerotherapy basically is a method of treating blood vessels or blood vessel malformations and even those of the lymphatic system, which are vessels related to the immune system offering protection against infection.
A medicine is injected into the vessels, which makes them contract. It is mainly appropriate for young children as well as young adults who have vascular and lymphatic malformation. In Ultrasound-Guided Sclerotherapy, the ultrasound is applied to monitor the underlying vein so that the doctor can send and observe the injection.
In its contemporary resurgence sclerotherapy has developed into the most successful and complete tool for the administration of big varicose veins and venous malformation. Appropriate sclerotherapy must be carried out by a skilled health care provider for exceptional results to be reliably obtained.
According to Merriam-Webster dictionary and everything I've ever learned through research, Sclerotherapy is the injection of a sclerosing agent (as saline) into a varicose vein to produce inflammation and scarring which closes the lumen and is followed by shrinkage.