Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , vascular plethora and vascular blurring has increased , consistent with increasing CHF . Increased retrocardiac opacity , consistent with left lower lobe collapse and / or consolidation , is similar to the prior study . Patchy opacity at the right lung base is also similar . Minimal blunting of the right costophrenic angle is consistent with a small right pleural effusion . Presence of a small left effusion can not be excluded . The cardiomediastinal silhouette is enlarged , but grossly unchanged . Again seen is a left - sided pacemaker , with lead tips over the right ventricle . Probable background COPD . Linear density to left of the trachea at the level of the thoracic inlet likely represents vascular calcification .
    OUTPUT:
    
1 . Increase in the degree of vascular congestion , compared 1 day earlier , consistent with increasing CHF . 2 . Bibasilar opacities , without significant interval change . This likely represents atelectasis , but an early pneumonic infiltrate would be difficult to exclude .