Clavicle is the bone that forms anterior border of shoulder arch. It lies on anterosuperior of thorax with first rib. Clavicle is very near to major vascular structures, brachial plexus, esophagus and trachea at thoracic inlet. Because of this, clavicular lesions fractures and sternoclavicular dislocations -especially posterior dislocations- may cause symptoms due to compressing symptoms due to these structures. In this article we present a case with enostosis of clavicle causing respiratory failure by compressing on trachea.