Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . Bilateral combined alveolar and interstitial opacities in the mid and lower lungs have progressed compared to ___ . No pleural effusion . Osseous structures are unremarkable .
    OUTPUT:
    
Worsening diffuse lung opacities , which may represent worsening organizing pneumonia or superimposed infection .