Superior vena cava syndrome (SVCS) is when something -- usually a cancerous tumor -- blocks or pinches the superior vena cava, a major vein that carries blood from your chest, neck, and head to your ...

Compression or obstruction of the superior vena cava, a major vein in your body, can lead to superior vena cava syndrome, or SVCS. It’s treatable, but most cases are caused by cancer. The superior ...

The superior vena cava is the vein that carries deoxygenated blood from the upper body to the heart. Superior vena cava syndrome is often a secondary problem caused by a cancerous tumor or a blood ...