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Alternative Names Return to topSuperior vena cava obstruction; Superior vena cava syndrome
Definition Return to top
SVC obstruction is a narrowing or blockage of the superior vena cava -- the second largest vein in the human body. The superior vena cava moves blood from the upper half of the body to the heart.
Causes Return to top
Superior vena cava (SVC) obstruction is a relatively rare condition.
Most often it is caused by cancer or a tumor in the mediastinum (the area of the chest under the breastbone and between the lungs).
The types of cancer that can lead to this condition include:
Superior vena cava obstruction can also be caused by noncancerous conditions that cause scarring. These conditions include lung infections (such as tuberculosis), histoplasmosis infection, and inflammation of a vein ( thrombophlebitis).
Other causes of superior vena cava obstruction include blood clots in the superior vena cava, aortic aneurysm, constrictive pericarditis, and enlargement of the thyroid gland (goiter).
Symptoms Return to top
Symptoms occur when something blocks the blood flowing back to the heart. They may begin suddenly or gradually, and may worsen when bending over or lying down.
Exams and Tests Return to top
An examination may show enlarged veins of the face, neck, and upper chest. Blood pressure is often high in the arms and low in the legs.
A bronchoscopy may be performed if lung cancer is suspected.
Obstruction of the SVC may show on:
This disease may also alter the results of the following tests:
Treatment Return to top
The goal of treatment is to relieve the obstruction.
Diuretics or steroids may be used to relieve swelling.
Other treatment options may include radiation, chemotherapy, or surgical removal of tumors. Surgery to bypass the obstruction is rarely performed. Placement of a stent to open up the SVC is available at some medical centers.
Outlook (Prognosis) Return to top
The outcome varies depending on the cause and the extent of obstruction.
Possible Complications Return to top
The throat could become obstructed and block the airways.
Elevated pressure may develop in the brain, resulting in altered levels of consciousness, nausea, vomiting, or visual changes.
When to Contact a Medical Professional Return to top
Call your health care provider if you have a lung tumor and develop symptoms of SVC obstruction. Complications are serious and can sometimes be fatal.
Prevention Return to top
Prompt treatment of other medical disorders may reduce the risk of developing SVC obstruction.
References Return to top
Rice TW, Rodriguez MR, Light RW. The superior vena cava syndrome: clinical characteristics and evolving etiology. Medicine (Baltimore). 2006;85;1:37-42.
Wilson LD, Detterbeck FC, Yahalom J. Superior vena cava syndrome with malignant causes. N Engl J Med. 2007;356:1862-1869.Update Date: 1/16/2009 Updated by: Jacob L. Heller, MD, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington, Clinic. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.