Ultravist, a contrast agent used in paraclinical techniques. The drug has many different concentrations such as Ultravist 150, Ultravist 240, Ultravist 300 and Ultravist 370. Ultravist can be used for both adults and children but cannot be used for pregnant women.

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.