Superior vena cava obstruction: evaluation with digital subtraction angiography.

Superior vena cava (SVC) obstruction is an uncommon but dramatic clinical presentation that often requires immediate treatment. We present a technique for evaluation of SVC syndrome using small-gauge butterfly needles and intravenous digital subtraction angiography, and we report our results in ten patients. We find this technique superior to conventional venography since it is rapid, easy, safe, and more cost-effective to perform.