Superior vena cava syndrome is caused most commonly by –
Correct Answer: Small cell carcinoma
Description: "Superior vena cava syndrome results from obstruction of the superior vena cava by central upper lobe tumors, usually the small cell tumors" - Cecil, 5/e, p 1207 (Cecil is a standard text book of Medicine by Saunders publication) "Superior vena cava (SVC) syndrome most frequently occurs with small-cell carcinoma, with bulkly enlargement of involved mediastinal lymph nodes and compression of the SVC." - Schwartz 9/e
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