Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are unchanged . There are coronary calcifications . Aside from retrocardiac atelectasis , the lungs are clear . There is no pneumothorax or pleural effusion . There are mild degenerative changes in the thoracic spine
    OUTPUT:
    
No acute cardiopulmonary abnormalities