Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The heart is not enlarged . Mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . There is mild pleural thickening at the lung apices . Within the limitations of routine chest radiography no displaced rib fractures detected . The upper thoracic spine is obscured by the patient 's shoulders but the remaining visualized thoracic levels normal vertebral heights , disc spaces and alignment .
    OUTPUT:
    
No definite acute intrathoracic injury . However , this study is suboptimal for evaluation of the thoracic spine . If clinically indicated dedicated radiographs of the thoracic spine or CT may be obtained .