Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are within normal limits . Minimal atherosclerotic calcifications are noted at the aortic arch . No focal consolidation , pleural effusion or pneumothorax is seen . Lungs are hyperinflated compatible with history of COPD . A curvilinear opacity within the left perihilar region is felt to be a summation shadows . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .