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Fig. 2A —51-year-old woman with varicose veins. Three-dimensional volume-rendered image obtained at opacity–transparency function setting for muscle planes shows enlarged left great saphenous vein (black arrow) and tortuous varicose veins (asterisk). Perforating veins are vividly shown, and paratibial (white arrow) as well as posterior tibial (arrowhead) perforating veins are evident.