<prompt> Features of superior vena cava syndrome are all except which of the following?Facial swellingHoarsenessAggravation of symptoms in sitting positionSyncope  <response>: Answer- C. Aggravation of symptoms in sitting positionSuperior vena cava syndrome SVCS is the clinical manifestation of superior vena cava SVC obstruction, with severe reduction in venous return from the head, neck and upper extremities.Aggravating factors:Bending forward or lying down may aggravate the symptoms. 