Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Linear left basilar opacities are likely atelectasis or scarring . Old right - sided rib fractures are noted . There is no pleural effusion or pneumothorax . The heart is normal in size with normal aortic contour .
    OUTPUT:
    
No acute intrathoracic process .