Compression of the neurovascular structures passing through the thoracic outlet causes thoracic outlet syndromes. To identify the etiologies of the different kinds of thoracic outlet syndrome, various examination approaches can be performed. Ultrasonography is a simple and inexpensive test that can be used to diagnose both arterial and venous thoracic outlet syndrome.
Physical trauma from a car accident, repetitive injuries from work or sports, anatomical anomalies (such as having an additional rib), and pregnancy are all common causes of thoracic outlet syndrome. The reason for thoracic outlet syndrome is sometimes unknown to clinicians.