<prompt> Which of the following tumor is most commonly associated with superior vena cava syndrome?LymphomaSmall cell carcinomaNon small cell carcinomaMetastasis  <response>: Malignant tumors such as lung cancer, lymphoma and metastatic tumors are responsible for 90 of SVCS cases. Lung cancer paicularly, small cell and squamous cell histologies account for approx 85 of all cases of malignant origin. Ref: Harrisons 16th Edition, Page 575 