Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart appears mildly enlarged . Cardiomediastinal contours are unremarkable . There are bibasilar opacities , mainly within the costophrenic angles , most likely representing atelectasis . No pneumothorax is appreciated . Subcutaneous air is noted along the left lateral chest wall . There are also multiple rib fractures on the left as previously seen .
    OUTPUT:
    
1 . Left - sided rib fractures with no radiographic evidence of pneumothorax . 2 . Bibasilar opacities likely representing atelectasis .