Upper limb and facial vascular varicosities, edema and bruising are symptoms of superior vena cava syndrome, also known as superior vena cava obstruction syndrome, which is a syndrome caused by venous obstruction in the superior vena cava or its surrounding lesions, resulting in obstruction of blood flow in the superior vena cava, resulting in varicosities, edema and bruising in the upper limbs and facial veins. Laboratory tests for varicose, edema and bruising of upper limbs and facial vessels: 1.Dimensional ultrasonography and pulsed Doppler ultrasonography can probe and determine the site and lesion pattern of superior vena cava obstruction, and probe the site and lesion pattern of superior vena cava obstruction, and probe the site and lesion pattern of superior vena cava obstruction, and control the upper vena cava blood flow spectrum to determine the presence of superior vena cava obstruction. 2.Radionuclide venography can show the obstruction of superior vena cava. 3.Magnetic resonance imaging can clearly show the lesion. 4.CT examination shows the lesion, and can also be guided by percutaneous puncture for histological diagnosis. 5.Thoracic X-ray often shows mediastinal masses. 6.Superior vena cava angiography Superior vena cava angiography can clarify the site and extent of obstruction and the type of distribution of collateral circulation.