Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Elevation of the right hemidiaphragm is chronic and stable since at least ___ . The left retrocardiac opacity persists since ___ , and there now appears to be ill - defined opacification in the left mid lung . Increase in size of right pleural effusion since ___ . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pneumothorax is seen .
    OUTPUT:
    
1 . Persistent left retrocardiac opacity since ___ with new ill - defined opacity in the left midlung , likely representing pneumonia . 2 . Increasing right pleural effusion since ___ .