Acute disruption of the thoracic aorta due to blunt chest trauma is a life-threatening injury. The majority of patients with an aortic tear die at the scene while approximately 15-20% of the victims reach the hospital alive. A 25 years old man was admitted to emergency service because of traffic accident. On the chest X ray; left pleural effusion, left apical pleural cap, the evanescence of aortic knob and aorticopulmonary window, mediastinal widening (>8 cm), tracheal deviation to right side were seen. The patient was transferred to the operating room by the diagnosis of aortic rupture. At the operation, the tear was seen on proximal site of subclavian artery pointed from aorta. After the primary repair, the patient arrested. The cardiac rescucitation was performed but he didn’t answer. In this case, we aimed that the chest x-ray is useful measurement in the radiological evaluation of the traumatic aortic rupture.