MOCA Versus RFA in the Treatment of Primary Great Saphenous Varicose Veins

Inclusion Criteria: * Insufficiency of the GSV * Signed informed consent * Patient willing to participate in follow-up scheme * Age \> 18 years * Ultrasound criteria for endovenous treatment have been met: * Diameter GSV between 3-12 mm * No thrombus in the to be treated segment of the GSV Exclusion Criteria: * Patient not able to give informed consent * Patient unable to present at follow-up visits * Other treatment is more suitable * Pregnancy and breast feeding * Known allergy/ contra-indication for sclerotherapy * Previous ipsilateral surgical treatment of varicose veins * Deep venous thrombosis or lung emboli in medical history * Anticoagulant therapy * C5-C6 varices * Immobilization * Fontaine II or IV peripheral arterial disease * Severe kidney function decline (GFS \< 30 mL/min) * Coagulation disorder or increased risk for thrombo-embolic complications(hemofilie A or B, v. Willebrand disease, Glanzmann disease, Factor VII-deficiency, idiopatic thrombocytopenic purpura, Factor V Leiden) * Liver diseases accompanied by changes in blood coagulation, livver cirrhosis