Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lungs are well expanded and clear . Pectus carinatum accounts for the appearance of a large perceived retrosternal airspace on the lateral film , and this should not be interpreted as a sign of hyperinflation . There is no pulmonary edema , pleural effusion , or pneumothorax .
    OUTPUT:
    
No pneumonia , pleural effusion , or pulmonary edema .