Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is no pleural effusion or pneumothorax . 6 mm left lower lobe ground - glass opacity seen on prior CT of the chest is not appreciated on this study .
    OUTPUT:
    
No acute cardiopulmonary abnormality .