Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is marked poly chamber cardiomegaly . Allowing for technical differences , the appearance is similar , but probably slightly worse , compared to ___ , and definitely increased compared with ___ . The water bottle configuration raises the question of pericardial effusion . The aortic knob does not appear dilated . There is upper zone redistribution , possible mild vascular blurring , and small bilateral effusions , with bibasilar atelectasis . This appearance is similar to the prior film . Prominence of the right hilum is also similar . Background hyperinflation raises question of background COPD .
    OUTPUT:
    
1 . Cardiomegaly , slightly increased compared with ___ . Is there concern for pericardial effusion ? 2 . Mild CHF with small bilateral effusions and bibasilar atelectasis . 3 . Prominence of the right hilum , unchanged compared with ___ . Attention to this area on followup films , after resolution of acute symptoms , is requested . 4 . Possible background COPD .