Thoracic Outlet Syndrome

(TOS)

Definition

The thoracic outlet is the area of the lower neck and upper chest. This area has a variety of nerves, blood vessels, muscles, and bones that run through a fairly small area. When the nerves and blood vessels of this area are compressed, irritated, or injured, they can cause a range of symptoms known as thoracic outlet syndrome (TOS).
Thoracic Outlet Syndrome
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Causes

Compression, injury, or irritation of nerves and blood vessels can be caused by:
  • Defects in nearby structures
  • Poor posture
  • Trauma
  • Repetitive arm or shoulder movement
  • Tumors

Risk Factors

Factors that may increase your chance of thoracic outlet syndrome include:
  • Having an abnormal first rib
  • Poor posture
  • Repetitive motion
  • Trauma
  • Obesity

Symptoms

Thoracic outlet syndrome may cause the following:
  • Arm or hand pain
  • Arm or hand weakness
  • Numbness and tingling
  • Cold sensitivity in the hands and fingers
  • Pain or sores of the fingers
  • Poor blood circulation to the arm, hands, and fingers
  • Swelling of the limb
  • Skin of arm turning pale and blue

Diagnosis

Your doctor will ask about your symptoms and medical history. A physical exam will be done.During an elevated arm stress test, your doctor will ask you to hold your arms and head in positions that may cause the thoracic outlet syndrome (TOS) symptoms to reappear. The results of these tests will help determine whether you have TOS and rule out other possible related conditions.Other tests may include:
  • Blood tests
  • Electromyography, other nerve conduction tests
Images of internal body structures may be taken with:

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