[Ultrasound study before surgery of varicose veins].

Ultrasonographic investigation of the various forms of chronic venous insufficiency has substantial advantages compared to diagnosis with the competing phlebogram, particularly preoperatively. Important details such as side branches in the region of the groin, course variations of the small saphenous vein and insufficiency of the perforators in the lower leg are sometimes missed in the antegrade phlebogram. However, it is absolutely necessary to take these into consideration in order to attain a substained good result of surgery. With adequate qualification of the investigator and using all ultrasound techniques, diagnosis by sonography is better than by means of antegrade phlebogram. There are clear specifications for the documentation. With regard to costs and time required, ultrasonographic investigation of chronic venous insufficiency is superior to the antegrade phlebogram and can be repeated at any time.