Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is opacification of the left lower hemithorax with deviation of the trachea and mediastinum towards the left consistent with left lower lobe collapse . There is no pneumothorax . The right lung is clear . There is no right pleural effusion . A left pleural effusion can not be excluded . No rib fractures are seen .
    OUTPUT:
    
Left lower lobe collapse with deviation of the trachea and mediastinum towards the left . No evidence of pneumothorax or rib fractures . A left pleural effusion can not be excluded .