Table 1 Cases where endovenous thermal ablation should not be performed (improper cases).

Normal vein (saphenous vein without valvular insufficiency)

Venous dilatation without valvular insufficiency

Partial valvular insufficiency of the saphenous vein

Primary varicose veins of the lower extremities without stasis symptoms

To prevent worsening of varicose veins or pulmonary thromboembolism in the future