Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated . There is mild retrocardiac atelectasis . There is no evidence of focal consolidation or pulmonary edema . There is no pneumothorax or pleural effusion . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal .
    OUTPUT:
    
No acute cardiopulmonary process .