Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . There is no pleural effusion or pneumothorax with linear left lower lung atelectasis noted . The heart is top normal in size with normal cardiomediastinal contours . No displaced rib fractures are identified .
    OUTPUT:
    
No acute intrathoracic process with mild left basilar linear atelectasis .