Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is mildly enlarged , unchanged from prior exam . Mediastinal silhouette and hilar contours are stable . A left pectoral AICD is unchanged in position . Lungs are clear . There is no pleural effusion or pneumothorax . Mild blunting of bilateral costophrenic angles are likely due to pleural thickening .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of pneumonia or edema .