The superior vena cava is one of the main veins in the body that carries blood from the head, neck, upper chest and arms to the heart. Superior vena cava syndrome, also known as superior vena cava syndrome, occurs when a cancerous tumor or blood clot restricts blood flow in the vein. this.

Superior vena cava obstruction syndrome can occur due to external compression, intrinsic stenosis or thrombosis within the vein. Among them, malignant tumors are often the main cause of superior vena cava obstruction. Therefore, if not diagnosed and intervened promptly, superior vena cava obstruction will quickly threaten the patient's life.