EVLT is an abbreviation for Endovenous Laser Therapy. This is a non-surgical, minimally invasive procedure, which uses laser energy to ablate specific abnormal (varicose) veins in the leg. This is the least invasive and most successful procedure for treatment of abnormal “truncal veins”. A duplex ultrasound is performed to determine candidacy. This option may not be appropriate for every patient due to vein position and anatomy.