An MRI may reveal differences in anatomy, such as a fibrous band connecting your spine to your rib or a cervical rib. Sometimes dye is injected to better see the blood vessels. An MRI may be helpful to determine the location and cause of blood vessel compression. An MRI uses radio waves and magnetic fields to create a detailed view of your body. A CT scan may identify the location and cause of blood vessel compression. A dye may be injected into a vein to view the blood vessels in greater detail, known as CT angiography. A CT scan uses X-rays to get cross-sectional images of your body. X-rays also can help to rule out other conditions that could be causing your symptoms. An X-ray can reveal an extra rib, known as a cervical rib. This test may be used to see if you have venous or arterial thoracic outlet syndrome or other vascular conditions. It's often the first imaging test used to help diagnose thoracic outlet syndrome. An ultrasound uses sound waves to create images of your body. To confirm the diagnosis of thoracic outlet syndrome, you may need one or more of the following tests: You also may be asked about your job duties and physical activities. Tell your healthcare professional about your medical history and symptoms. Knowing which positions and movements trigger your symptoms can help identify thoracic outlet syndrome. Your health professional may reproduce your symptoms by asking you to move or lift your arms or turn your head.
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