Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study of ___ , numerous left - sided rib fractures have become moderately displaced with inward collapse at the fracture site . No definite pneumothorax is appreciated . Increased density of both lung bases is likely related to compression atelectasis from the partial chest wall collapse . There may be small bilateral pleural effusions .
    OUTPUT:
    
1 . New moderate displacement and angulation of multilevel rib fractures . 2 . Increased bibasilar opacification likely due to compressive atelectasis . 3 . No definite pneumothorax .