Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . Aside from a linear atelectasis in the left base , The lungs are clear . There is no pneumothorax or pleural effusion . Hardware in the upper thoracic spine is unchanged . There is no evidence of new fractures .
    OUTPUT:
    
No acute cardiopulmonary abnormalities