Thoracic Outlet Syndrome

Thoracic outlet syndrome is a group of conditions in which the nerves or blood vessels running to the arm are squeezed in the narrow space between the collarbone, the first rib and the neck muscles. There are three types: neurogenic, affecting the nerves, which makes up over 90 percent of cases, venous and arterial.

The venous and arterial types are clear-cut and frequently need surgery. Neurogenic thoracic outlet syndrome is harder: no single test proves it, the symptoms overlap with neck and shoulder problems, and specialists disagree about how often it should be operated. Physiotherapy comes first, and surgery helps carefully selected patients.

Symptoms

• Tingling and numbness in the hand, often in the ring and little fingers
• Aching in the neck, shoulder, armpit and arm
• Symptoms that worsen when working overhead, carrying bags or driving
• Weak grip, and wasting at the base of the thumb in long-standing cases
• Sudden swelling, heaviness and bluish colour of the whole arm, in the venous type
• A cold, pale, painful hand or sores on the fingers, in the arterial type
• Fatigue of the arm with use

Causes and risk factors

The space can be narrowed by an extra rib arising from the neck vertebrae, present in about 1 in 150 people, by an abnormally long transverse process, by fibrous bands, by enlarged or scarred scalene muscles, by a poorly healed collarbone fracture or by rounded, drooping shoulders. Whiplash injury and repetitive overhead work or sport, such as swimming, throwing, volleyball and weightlifting, are frequent triggers. Venous thoracic outlet syndrome, known as effort thrombosis or Paget-Schroetter syndrome, typically strikes young, athletic people after strenuous use of the arm.

How it is diagnosed

• History and examination: Provocation manoeuvres such as the elevated arm stress test, tenderness above the collarbone and a careful search for other causes.
• X-ray of the neck and chest: Shows a cervical rib or other bony abnormality.
• Nerve conduction studies and MRI of the neck: Mainly to exclude carpal or cubital tunnel syndrome and disc problems. They are often normal in neurogenic cases.
• Duplex ultrasound, CT or MR angiography and venography: With the arms down and then raised, for suspected venous or arterial compression.
• Scalene muscle block: Temporary relief after an injection of local anaesthetic supports the diagnosis and predicts the response to surgery.

Treatment options

• Targeted physiotherapy: Correction of posture, stretching of the scalene and pectoral muscles, strengthening of the shoulder blade muscles and changes at the workstation, for 3 to 6 months. This helps most neurogenic cases.
• Pain management: Anti-inflammatories, medicines for nerve pain and botulinum toxin injections into the scalene muscles, which give temporary relief.
• Clot-dissolving treatment and anticoagulation: For venous thoracic outlet syndrome with a fresh clot, ideally within 2 weeks, followed by decompression.
• First rib resection with scalenectomy: Performed through the armpit, above the collarbone or by keyhole and robotic chest approaches. A cervical rib is removed if present.
• Arterial reconstruction: Repair or bypass of a damaged subclavian artery or aneurysm, combined with decompression.
• Rehabilitation after surgery: Several months of guided exercise. Nerve symptoms improve slowly.

When it is urgent

A suddenly swollen, blue, heavy arm, or a cold, white, painful hand, needs same-day hospital care nearby, since a clot in the vein or artery must be treated quickly. Chest pain or breathlessness together with a swollen arm may mean a clot has reached the lungs. Call emergency services.

Travelling to Türkiye for treatment

Surgery for thoracic outlet syndrome is specialised and results depend on experience, so travelling to a team that performs it regularly can be justified, particularly for the venous and arterial types or when a cervical rib is present. For neurogenic symptoms, complete a proper physiotherapy programme at home first, and bring nerve studies, imaging and ideally the result of a scalene block. Allow 10 to 14 days on site, and expect months of rehabilitation at home. A fresh arm clot should be treated locally and not after a flight.

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Frequently Asked Questions