Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate enlargement of the cardiac silhouette is re - demonstrated . Lung volumes are decreased compared to the previous radiograph . The aorta is diffusely calcified and mildly tortuous . Small bilateral pleural effusions are noted along with mild pulmonary vascular congestion . Additionally more focal opacity within the retrocardiac region is concerning for an area of pneumonia though atelectasis could have a similar appearance . No pneumothorax is identified . There are multilevel mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and small bilateral pleural effusions . Retrocardiac opacity may reflect pneumonia , though atelectasis may have a similar appearance .