Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffusely enlarged cardiomediastinal silhouette is stable and chronic dating back to ___ . Compared with most recent prior radiograph , bibasilar opacities have resolved . No focal consolidation , pleural effusion or pneumothorax is present . There is no evidence of pulmonary vascular congestion .
    OUTPUT:
    
No acute intrathoracic process . Stable chronic severely enlarged cardiac silhouette .