Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lung opacity is re - demonstrated . Known small hemothorax blunts the left costophrenic sulcus . Heart size is normal . Known small left pneumothorax is not well seen . Non-displaced rib fractures are better seen on concurrent CT of the chest .
    OUTPUT:
    
Known small left pneumothorax seen on CT is not appreciated on the radiograph . Left lower lobe contusions are also better seen on CT .