Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again mildly enlarged . The cardiac , mediastinal and hilar contours appear unchanged . There is perhaps a minimal persistent central interstitial abnormality but no substantial edema . Pulmonary edema has almost fully resolved . There is no focal opacity . No pleural effusion or pneumothorax is demonstrated .
    OUTPUT:
    
Perhaps minimal residual congestive change , but no substantial pulmonary edema or evidence of pneumonia .