Fig. 13-2. Normal venograms showing (right) the deep veins of the leg, the popliteal vein, the great saphenous vein, and (left) the femoral and deep femoral veins. Note the slight bulges at the valves, in some of which the cusps can be distinguished. (Courtesy of G. M. Stevens, M.D., Palo Alto Medical Clinic, Palo Alto, California.) Click for high resolution image.