Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP view of the chest was provided . The patient has been extubated . Lung volumes are low . Bilateral symmetric opacities are more likely atelectasis given the low lung volumes and recent extubation . There is no pneumothorax or pleural effusions . The mediastinum is slightly widened , which may be positional . The heart size is top normal .
    OUTPUT:
    
Bibasilar opacities , most likely atelecasis .