In case of clinical symptoms of subclavian vein thrombosis a phlebogra
phic or color Doppler sonographic investigation should be performed. P
hlebography is a sensitive method to exclude the thrombosis in the sub
clavian vein but not in the jugular vein. Color Doppler sonography add
itionally gives information about the surrounding tissue and the jugul
ar vein. The authors analyze their color Doppler sonographic data, fir
st, to evaluate the association of internal jugular and subclavian vei
n thrombosis and, second, to demonstrate the necessity for a color Dop
pler investigation. Of 213 patients who suffered from a thrombosis, 93
had a subclavian vein thrombosis, 64 had a combined thrombosis in the
internal jugular and subclavian vein, and 56 had an isolated internal
jugular vein thrombosis. There is a high association between subclavi
an and internal jugular vein thrombosis, and a color Doppler investiga
tion of both the subclavian and internal jugular veins is necessary.