Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright view of the chest demonstrates interval left pleural catheter placement , which projects over lateral left chest . Moderate left pleural effusion has decreased in size , now small . Left lung base opacities persist , which may represent atelectasis . Trace right pleural effusion is likely . There is no appreciable pneumothorax . Hilar and mediastinal silhouettes are unchanged . Ascending aorta remains tortuous . There is also enlargement of pulmonary arteries , most pronounced on the left . The heart is mildly enlarged . Lungs are otherwise clear . There is no pulmonary edema .
    OUTPUT:
    
Moderate left pleural effusion has decreased following left pleural drain placement , now small in size . No pneumothorax .