Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left retrocardiac opacification , not seen on the frontal view . This is likely pneumonia in appropriate clinical setting . The hila and pulmonary vasculature are normal . No pleural abnormalities or pneumothorax . The cardiac silhouette is enlarged but unchanged . The mediastinum is normal . No fractures .
    OUTPUT:
    
Retrocardiac opacification only seen on lateral view , likely pneumonia in appropriate clinical setting .