Due to compression of neurovascular bundle passing between two scalene muscles at upper chest/upper limb area. Also try Brachial Neuralgia, Brachial Plexus Neuritis, Hypochondrium, and Nerve Compression Syndromes.Encyclopedia Entry for Thoracic Outlet Syndrome :Thoracic outlet syndrome. Nerves coming from the spine and major blood vessels of the body pass through a narrow space near your shoulder and collarbone on the way to the arms. Sometimes, there is not enough space for the nerves to pass by through the collarbone and upper ribs. Pressure (compression) on these blood vessels or nerves can cause symptoms in the arms or hands. Pressure may happen if you have: An extra rib above the first one. An abnormal tight band connecting the spine to the ribs. People with this syndrome often have injured the area in the past or overused the shoulder. People with long necks and droopy shoulders may be more likely to develop this condition because of extra pressure on the nerves and blood vessels.Symptoms of thoracic outlet syndrome may include: Pain, numbness, and tingling in the pinky and ring fingers, and the inner forearm Pain and tingling in the neck and shoulders (carrying something heavy may make the pain worse) Signs of poor circulation in the hand or forearm (a bluish color, cold hands, or a swollen arm) Weakness of the muscles in the hand.Your health care provider will examine you and ask about your medical history and symptoms. The following tests may be done to confirm the diagnosis: Electromyography (EMG) CT angiogram MRI Nerve conduction velocity study X-ray Tests are also done to rule out other problems, such as carpal tunnel syndrome or a damaged nerve due to problems in the neck.Physical therapy is often used to treat thoracic outlet syndrome. It helps: Make your shoulder muscles stronger Improve your range of motion in the shoulder Promote better posture Your provider may prescribe pain medicine. If there is pressure on a vein, your provider may give you a blood thinner to prevent a blood clot. You may need surgery if physical therapy and changes in activity do not improve your symptoms. The surgeon may make a cut either under your armpit or just above your collarbone. During surgery, the following may be done: An extra rib is removed and certain muscles are cut. A section of the first rib is removed to release pressure in the area. Bypass surgery is done to reroute blood around the compression or remove the area that is causing the symptoms. Your doctor may also suggest other alternatives, including angioplasty , if the artery is narrowed.Surgery to remove the extra rib and break up tight fiber bands may ease symptoms in some people. Some people have symptoms that return after surgery.Complications can occur with any surgery, and depend on the type of procedure and anesthesia. Risks related to this surgery include: Damage to nerves or blood vessels, causing muscle weakness Lung collapse Failure to relieve the symptoms.Thoracic outlet anatomy Thoracic outlet anatomy.Filler AG. Brachial plexus nerve entrapments and thoracic outlet syndromes.