Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen are multiple left - sided rib fractures . A previous - seen tiny left apical pneumothorax is now less apparent . The heart size is normal . The hilar and mediastinal contours remain within normal limits . An ill - defined left basilar opacity subjacent to the rib fractures is now slightly more defined in comparison to prior examinations , possibly representing contusion .
    OUTPUT:
    
Multiple left - sided rib fractures . Previously seen tiny left apical pneumothorax is now less apparent .