Affects 2-5% of all patients with TOS. Arterial TOS is caused by subclavian artery compression within the scalene triangle leading to the development of occlusions or aneurysms. These lesions almost always occur in association with a congenital cervical rib or other bony anomaly. Ulcerative subclavian artery lesions and aneurysms are often accompanied by mural thrombus … Continue reading Arterial Thoracic Outlet Syndrome (TOS)