Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle areas of lucency overlie the left lung which suggest that the pneumothorax is persistent . The extensive subcutaneous emphysema within the soft tissues of the neck , left shoulder and left flank is unchanged . A definite pleural contour is not seen . Multiple displaced right posterior rib fractures are unchanged . Mild pulmonary vascular congestion is slightly worse . There is left basilar atelectasis obscuring the hemidiaphragm . The hilar and mediastinal contours are otherwise normal . There is no pleural effusion .
    OUTPUT:
    
1 . Persistent left pneumothorax which is much better appreciated on the prior CT . 2 . Unchanged extensive subcutaneous emphysema in the soft tissues of the neck , left shoulder and left flank . 3 . Multiple unchanged displaced rib fractures . 4 . Worsening mild pulmonary vascular congestion and left basilar atelectasis .