Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe cardiomegaly and mediastinal pulmonary vascular engorgement are slightly increased from ___ . Mild interstitial pulmonary edema is unchanged from ___ . Bibasilar atelectasis is improved . No large pleural effusion . Stable postoperative mediastinum .
    OUTPUT:
    
1 . Mild congestive heart failure . 2 . Severely enlarged heart with mild pulmonary edema raises the possibility of pericardial effusion . Echocardiogram could clarify . 3 . No definite pneumonia .