Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable frontal radiograph of the chest was acquired . There is redemonstration of intact sternotomy wires as well as surgical clips scattered throughout the lower thorax , unchanged . The previously seen vascular stent projecting over the mid abdomen is only partially imaged on today 's study . Moderate enlargement of the cardiac silhouette is increased compared to the prior study . There is a dense retrocardiac opacification , increased , possibly secondary to atelectasis , although infection and / or aspiration could have an identical appearance . Small bilateral pleural effusions are not significantly changed . There is persistent pulmonary vascular congestion without frank interstitial edema . There is no pneumothorax . The mediastinal contours are unchanged .
    OUTPUT:
    
1 . Increased bibasilar retrocardiac dense opacification , possibly secondary to atelectasis , although an infectious process could appear similar . Clinical correlation recommended . 2 . Unchanged small bilateral pleural effusions . 3 . Findings suggesting mild pulmonary vascular congestion .