Prospective angiographic study of the abnormalities of systemic venous connections in congenital and acquired heart disease

Abnormalities of systemic venous connections were seen in approximately 5% patients with congenital heart disease and approximately 2% patients with acquired heart disease. Small tributaries or an innominate vein of variable size often connect left and right superior vena. Contrast material can be injected into these connections to document the presence of bilateral superior vena cava.