The cervical rib is an extra rib that develops as a result of elongation of the costal element of the transverse mass of the C7 vertebra. Its incidence ranges from less than 0.5 to 2.5 %, with some gender and laterality predilections, in different populations. It is rarely symptomatic. When large, it can cause various vascular and neurological symptoms. Thoracic outlet syndrome (TOS) is a group of manifestations that result from compression of one or more of the neurovascular structures in the thoracic outlet. The causes of TOS include musculoskeletal variations or anomalies, fibrous bands, tumors and post-traumatic conditions. Clinically, three forms of the TOS are identified: arterial, venous and neurogenic. Surgical options for decompression of the TOS include the transaxillary, the supraclavicular and the posterior subscapular approaches.