Superior vena cava syndrome(SVCS) is caused by malignant tumour, often showing tumour crisis.The prognosis is bad.It will endanger the life frequently if not cured in time.

• 上腔静脉压迫综合征是肿瘤患者常见的并发症之一,预后极差多呈急性或亚急性肿瘤危象,若得不到及时有效的治疗,则会迅速危及生命。