Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of a right pleural pigtail catheter with decrease in size of the right pleural effusion . Opacities in the right lower lung zone are noted , likely reflect development of pulmonary edema and the patient 's underlying lung cancer . Patchy airspace opacities in the left mid to lower lung zone have increased and may reflect a combination of atelectasis and superimposed infection . A small left pleural effusion persists . No pneumothorax identified . The size of the cardiac silhouette is within normal limits .
    OUTPUT:
    
Interval decrease in size of the right pleural effusion status post placement of a right pleural pigtail catheter . No pneumothorax identified . Persisting and slightly increased mid to lower lung zone airspace opacities likely reflect atelectasis and / or pneumonia .