Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left - sided chest tube which terminates along the medial left lung with a small left apical pneumothorax , overall similar to the prior exam . There is a small amount of subdiaphragmatic free air significantly improved compared to the prior exam . The heart size is normal . The hilar and mediastinal contours are normal . There has been interval improvement in the mild pulmonary edema . Mild bibasilar atelectasis is persistent . There may be a small left pleural effusion .
    OUTPUT:
    
1 . Stable small left apical pneumothorax . 2 . Interval improvement in the subdiaphragmatic free air compared to the prior exam , with mild residual subdiaphragmatic free air . 3 . Interval improvement in mild bilateral pulmonary edema .