Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac , mediastinal and hilar contours appear stable . Medial left basilar opacity suggests minor atelectasis . Otherwise , the lungs appear clear . There no pleural effusions or pneumothorax . Evaluation of bony structures is limited but no fracture is identified .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease or injury .