Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are borderline hyperinflated but clear bilaterally . The heart , mediastinum and hilar silhouettes are within normal limits and stable . Calcification of the aorta is again noted . Pleural surfaces are normal . There is no pleural effusion or pneumothorax . There is no displaced rib fracture ; radiographic evaluation of the chest cage requires detail views of clearly marked areas where the patient has focal physical findings .
    OUTPUT:
    
No radiographically evident cause for chest pain . No pneumothorax or displaced fracture is observed .