Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs demonstrate no focal parenchymal opacities are seen . The cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Chronic pleural thickening accounts for the blunting of the right costophrenic angle . Focal biapical pleural parenchymal scarring is again seen . There is no evidence of subdiaphragmatic free air . Bony structures are intact . Degenerative changes of both AC joints are noted .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No evidence of subdiaphragmatic free air .