Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left - sided chest tube with tip terminating near the medial left mid lung field . Small pneumothorax seen on the previous CT exam is not clearly identified on the current study . There has been interval decrease in size of the left pleural effusion , now appearing small to moderate in size . Small amount of subcutaneous emphysema in the left lateral chest wall is noted . Again demonstrated are low lung volumes . The cardiac and mediastinal contours are similar possible small pneumomediastinum noted to the left lateral aspect of the aortic knob . There is crowding of bronchovascular structures without pulmonary edema . Bibasilar patchy opacities likely reflect areas of compressive atelectasis . Multiple displaced left - sided rib fractures are again noted .
    OUTPUT:
    
Interval placement of left - sided chest tube with slight interval decrease in size of the left pleural effusion , now appearing small to moderate in size . Continued bibasilar atelectasis . Multiple left - sided rib fractures are re - demonstrated .