A 55 year old comes to Victoria OPD with history of swelling of his hands, shoness of breath.O/E facial plethora, distened neck viens was noted. Which is the most probable structure involved to cause these symptoms?

Superior vena cava(SVC)obstructioncan occur from extrinsic compression, intrinsic stenosis, or thrombosis. Malignancies are the main cause and are considered an oncologic emergency.Superior vena cava syndrome(SVCS)refers to the clinical syndrome with symptoms that results from this obstruction. Most common cause: malignancy.