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AnatomyBasicsFirst look at neurovasculature
Superior vena cava

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Superior vena cava

Last reviewed: December 24, 2019

The superior vena cava (SVC, also known as the cava or cva) is a short, but large diameter vein located in the anterior right superior mediastinum. Its latin name is related to its large pipe appearance in cadavers, 'cava' meaning 'hollow'.

The superior vena cava is very important for the function of the cardiovascular system, since it largely contributes to the input of blood to the right atrium. Any hypertensive process in the right half of the heart or in the pulmonary circulation retrogradelly affects both superior and inferior venae cavae. This is important since the veins are not adjusted to high pressures, which can result with forming an aneurysm or even rupture of the wall of the SVC.

Key facts
Source Brachiocephalic vein, azygos vein
Draining area Upper half of the body (above the diaphragm)
Drains to Right atrium of the heart
Clinical relations Superior vena cava obstruction (SVCO), superior vena cava syndrome (SVCS), superior vena cava aneurysm (SVCA), persistent left superior vena cava (PLSVC)

This article will discuss the anatomy and function of the superior vena cava.

Contents
  1. Anatomy
  2. Function
  3. Clinical notes
    1. Superior vena cava obstruction (SVCO)
    2. Superior vena cava syndrome (SVCS)
    3. Superior vena cava thrombosis
    4. Superior vena cava aneurysm
    5. Persistent left superior vena cava (PLSVC)
  4. Related diagrams and images
+ Show all

Anatomy

Embryologically, the SVC is formed by the left and right brachiocephalic veins (also known as the innominate veins) that also receive blood from the upper limbs, certain parts of the head, one being the eyes, and neck.

There is no valve that divides the SVC from the right atrium, which conducts blood from right atrial and right ventricular contractions upwards into the internal jugular vein (seen as the jugular venous pressure) and sternocleidomastoid muscle. 

The superior vena cava commonly pops up in exams. Find out how you can prepare effectively with our anatomy quiz questions!

Positionally, the SVC begins behind the lower border of the 1st right costal cartilage and descends vertically behind the 2nd and 3rd intercostal spaces to drain into the right atrium at the level of the 3rd costal cartilage. Its lower half is covered by a fibrous pericardium, which is pierced by the SVC at the level of the 2nd costal cartilage.

Recommended video: Superior vena cava
Anatomy and function of the superior vena cava.

Function

The SVC is one of the 2 large veins by which blood is returned from the body to the right side of the heart. After circulating through the body systemically, deoxygenated blood returns to the right atrium of the heart through either the SVC, which drains the upper body, or the inferior vena cava (IVC) that drains everything below the diaphragm.

Superior vena cava coursing towards the right atrium of the heart, returning deoxygenated blood from the body.

Clinical notes

Superior vena cava obstruction (SVCO)

This usually refers to a partial or complete obstruction of the SVC, often in the context of cancer (lung cancer, metastatic cancer, or lymphoma). Clinically this obstruction can lead to enlarged veins in the head and neck, and cause shortness of breath, cough, chest pain, and difficulty swallowing).

A clinical test known as Pemberton’s sign can be performed to identify this condition. A positive Pemberton's sign is marked by facial congestion and cyanosis (and/or respiratory distress) after 1 minute of having the patient elevate both arms until they touch the sides of the face. This sign is indicative of superior vena cava syndrome, commonly the result of a mass in the mediastinum.

Superior vena cava syndrome (SVCS)

This syndrome refers to a group of symptoms caused by the obstruction of the SVC. More than 90% of the cases of SVC obstruction are caused by cancer, most commonly bronchogenic carcinoma, which includes small cell and non-small cell lung carcinoma, Burkitt’s lymphoma, lymphoblastic lymphomas, pre-T-cell lineage acute lymphoblastic leukemia, and other acute leukemias.

Characteristic symptoms are edema of the arms and face, development of swollen collateral veins on the front of the chest wall, shortness of breath, difficulty swallowing, stridor, cough, and neurological symptoms (reduced alertness, etc. from edema in the brain or airway compromise). Again, Pemberton’s sign can be used to identify an SVCO.

Superior vena cava thrombosis

The thrombosis often occurs from a thrombus around a long-term central venous catheter (CVC), especially in cancer patients with permanent indwelling CVCs. CVC-related thrombosis is as high as 30% in adults. However, patients can be treated with thrombolytics or anticoagulants, or by removal of the catheter.

Superior vena cava aneurysm

Venous aneurysms arising from the mediastinal systemic veins are extremely rare, with the majority being fusiform (“spindle-shaped”) aneurysms that arise from the SVC.

Persistent left superior vena cava (PLSVC)

A PLSVC is an embryologic remnant that is the most common variation of the thoracic venous system, resulting from a failure to involute during embryologic development.

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Show references

References:

  • H. Knipe, MD and O. Bashir, MD: Superior vena cava. Radiopaedia.org. (accessed 2nd of August 2014)
  • Anne M Gilroy, Brian R MacPherson, Lawrence M Ross and Michael Schuenke, Atlas of Anatomy, 2nd edition, Thieme, Chapter 19, page 723.
  • Nascimbene A and Angelini P. (2011). Superior Vena Cava Thrombosis and Paradoxical Embolic Stroke due to Collateral Drainage from the Brachiocephalic Vein to the Left Atrium. Tex Heart Inst J. 38(2): 170–173.

Author:

  • Alice Ferng, MD-PhD

Illustrators:         

  • Superior vena cava (ventral view) - Begoña Rodriguez
  • Superior vena cava (lateral-right view) - Yousun Koh
  • Heart and great vessels (cadaveric dissection) - Prof. Carlos Suárez-Quian
© Unless stated otherwise, all content, including illustrations are exclusive property of Kenhub GmbH, and are protected by German and international copyright laws. All rights reserved.

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