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 .