[Costo-clavicular outlet syndrome].

Syndromes caused by the compression of the neurovascular bundle are not a rare pathology, though their exact frequency cannot be assessed. Neurovascular bundle in the upper limbs may be compressed at the costo-clavicular space, interscalene triangle or at the insertion of the minor pectoralis muscle into the coracoid process. More than 90% of patients present neurological symptoms and 10% also have vascular problems. Diagnosis depends on a careful clinical and instrumental study of the patients. Arteriography, phlebography and Doppler tests were of value in the diagnostic approach, showing the compression of the subclavian artery and vein using the arm abduction manoeuvre. Electromyography is of value in differential diagnosis of the carpal tunnel syndrome showing the entity and site of nerve compression. The best form of surgical treatment is resection of the first rib according to Roos, using an extrapleural and transaxillary route.