Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacities overlying the left mid and lower lung are increased from the prior examination and are consistent with aspiration or rapidly progressing pneumonia . The right hemithorax remains clear . There is no evidence of pneumothorax .
    OUTPUT:
    
Increased opacity of the left mid and lower lung worrisome for aspiration or rapidly progressing pneumonia .