Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear without confluent consolidation . There is no pulmonary edema or pleural effusions . Mediastinal and hilar contours are within normal limits . Mild cardiomegaly is new compared to prior examination . Flattening of the left hemidiaphragm is chronic . There is no pneumothorax .
    OUTPUT:
    
1 . Mild enlargement of the cardiac silhouette as compared to prior examination from ___ . Possibly due to progressive cardiomegaly or pericardial effusion . 2 . No pulmonary edema or pneumonia .