Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lobe very mild opacities have improved . There is no new lung consolidation . Mediastinal and cardiac contour are within normal limits . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild left lower lobe opacities have improved since the morning . This is mostly due to atelectasis or aspiration . There is no new consolidation .