Background
Superior vena cava syndrome results from the obstruction of blood flow through the superior vena cava and is most often due to thoracic malignancy. However, benign etiologies are on the rise secondary to more frequent use of intravascular devices such as central venous catheters and pacemakers, There also are other rare non neoplastic diseases that can cause SVCS, for example, fibrosing mediastinitis,(1.2) which is a rare chronic inflammatory condition similar to retroperitoneal fibrosis ,use for indwelling catheter and hypercoagulable condition as primary antiphospholipid syndrome which is very rare condition .