Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The focal opacities over the left mid lung visualized on ___ are mildly improved . There is no focal consolidation , pleural effusion , or pneumothorax . The heart size is top normal . The cardiac , hilar , and mediastinal contours are within normal limits .
    OUTPUT:
    
Mild improvement of left lung opacities which , likely related to prior radiation treatments .