Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP view of the chest was provided . There has been interval placement of a left pleural pigtail catheter with interval decrease in size of left pleural effusion . There is noted to be a left hilar mass with hazy opacity within the left lung concerning for post - obstructive atelectasis . Again noted is mild opacity in the right upper lobe which could represent pneumonia . Emphysema is noted . No pneumothorax is seen .
    OUTPUT:
    
Interval placement of a left pleural drainage catheter with reduced left pleural effusion and no sign of pneumothorax . Otherwise , no change .