You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which is the most common tumor associated with superior vena cava syndrome? and explain in detail?
The superior vena cava syndrome usually is caused by neoplasms that compress or invade the superior vena cava, such as bronchogenic carcinoma or mediastinal lymphoma. -produces a characteristic clinical complex consisting of marked dilation of the veins of the head, neck, and arms associated with cyanosis. -Pulmonary vessels also can be compressed, causing respiratory distress.