Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires are intact and appropriately aligned . Stable enlargement of the cardiomediastinal silhouette . There is left basilar and retrocardiac opacification and silhouetting of the diaphragm , which has increased compared to ___ and is concerning for pneumonia . The right lung is essentially clear . There is a probable small left pleural effusion . The pulmonary vasculature is normal . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Increasing left basilar and retrocardiac opacification , concerning for pneumonia . 2 . Probable small left pleural effusion .