o bstruction of the superior vena cava produces a dramatic syndrome consisting of edema and plethora of the face, neck, and arms, engorgement of the veins in the neck, and the appearance of dilated, tortuous, superficial collateral veins on the arms, neck, and upper torso.’ The patient may also suffer from dyspnea and disturbance of the sensorium, both often worse in the recumbent position, and...
