Table 1 Schummer’s classification of superior vena cava
Types | Characteristics |
|---|---|
I | Normal superior vena cava anatomy |
II | Only PLSVC exists, without the right superior vena cava |
IIIa | PLSVC and the right superior vena cava exist, with left brachiocephalic vein between both sides |
IIIb | PLSVC and the right side of the superior vena cava, withoutleft brachiocephalic vein between both sides |